Gemalto M2M MC56 Transmitter module for mobile applications User Manual mc55 56 hid v0103a

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MC55/56 Hardware Interface Description
Confidential / Released
mo b i l e
MC55/56
Siemens Cellular Engine
Version:
DocID:
01.03a
MC55/56_hid_v01.03a
MC55/56_hid_v01.03a
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Document Name:
MC55/56 Hardware Interface Description
Version:
01.03a
Date:
January 23, 2004
DocId:
MC55/56_hid_v01.03a
Status:
Confidential / Released
General Notes
Product is deemed accepted by recipient and is provided without interface to recipient’s products. The
documentation and/or product are provided for testing, evaluation, integration and information
purposes. The documentation and/or product are provided on an “as is” basis only and may contain
deficiencies or inadequacies. The documentation and/or product are provided without warranty of any
kind, express or implied. To the maximum extent permitted by applicable law, Siemens further
disclaims all warranties, including without limitation any implied warranties of merchantability,
completeness, fitness for a particular purpose and non-infringement of third-party rights. The entire risk
arising out of the use or performance of the product and documentation remains with recipient. This
product is not intended for use in life support appliances, devices or systems where a malfunction of
the product can reasonably be expected to result in personal injury. Applications incorporating the
described product must be designed to be in accordance with the technical specifications provided in
these guidelines. Failure to comply with any of the required procedures can result in malfunctions or
serious discrepancies in results. Furthermore, all safety instructions regarding the use of mobile
technical systems, including GSM products, which also apply to cellular phones must be followed.
Siemens or its suppliers shall, regardless of any legal theory upon which the claim is based, not be
liable for any consequential, incidental, direct, indirect, punitive or other damages whatsoever
(including, without limitation, damages for loss of business profits, business interruption, loss of
business information or data, or other pecuniary loss) arising out the use of or inability to use the
documentation and/or product, even if Siemens has been advised of the possibility of such damages.
The foregoing limitations of liability shall not apply in case of mandatory liability, e.g. under the German
Product Liability Act, in case of intent, gross negligence, injury of life, body or health, or breach of a
condition which goes to the root of the contract. However, claims for damages arising from a breach of
a condition, which goes to the root of the contract, shall be limited to the foreseeable damage, which is
intrinsic to the contract, unless caused by intent or gross negligence or based on liability for injury of
life, body or health. The above provision does not imply a change on the burden of proof to the
detriment of the recipient. Subject to change without notice at any time. The interpretation of this
general note shall be governed and construed according to German law without reference to any other
substantive law.
Copyright
Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its
contents and communication thereof to others without express authorization are prohibited. Offenders
will be held liable for payment of damages. All rights created by patent grant or registration of a utility
model or design patent are reserved.
Copyright © Siemens AG 2004
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Contents
Document History ...................................................................................................... 7
Introduction ................................................................................................................ 8
1.1 Related documents ............................................................................................. 8
1.2 Terms and abbreviations..................................................................................... 9
1.3 Type approval ....................................................................................................12
1.4 Safety precautions .............................................................................................14
Product concept........................................................................................................16
2.1 MC55/56 key features at a glance......................................................................17
2.2 Circuit concept ...................................................................................................20
Application Interface.................................................................................................22
3.1 Operating modes ...............................................................................................23
3.2 Power supply .....................................................................................................25
3.2.1
Power supply pins on the board-to-board connector.............................25
3.2.2
Minimizing power losses.......................................................................26
3.2.3
Monitoring power supply.......................................................................26
3.3 Power up / down scenarios ................................................................................27
3.3.1
Turn on MC55/56 .................................................................................27
3.3.1.1 Turn on MC55/56 using the ignition line /IGT (Power on)..........28
3.3.1.2 Timing of the ignition process ...................................................29
3.3.1.3 Turn on MC55/56 using the POWER signal ..............................30
3.3.1.4 Turn on MC55/56 using the RTC (Alarm mode) ........................30
3.3.2
Turn off MC55/56 .................................................................................32
3.3.2.1 Turn off MC55/56 using AT command ......................................32
3.3.2.2 Maximum number of turn-on / turn-off cycles ............................32
3.3.2.3 Emergency shutdown using /EMERGOFF pin...........................33
3.3.3
Automatic shutdown .............................................................................34
3.3.3.1 Temperature dependent shutdown............................................34
3.3.3.2 Temperature control during emergency call ..............................35
3.3.3.3 Undervoltage shutdown if battery NTC is present .....................35
3.3.3.4 Undervoltage shutdown if no battery NTC is present ................36
3.3.3.5 Overvoltage shutdown ..............................................................36
3.4 Automatic GPRS Multislot Class change............................................................37
3.5 Charging control.................................................................................................38
3.5.1
Battery pack characteristics..................................................................39
3.5.1.1 Recommended battery pack .....................................................40
3.5.2
Implemented charging technique..........................................................41
3.5.3
Operating modes during charging ........................................................42
3.5.4
Charger requirements ..........................................................................43
3.6 Power saving .....................................................................................................44
3.6.1
No power saving (AT+CFUN=1) ...........................................................44
3.6.2
NON-CYCLIC SLEEP mode (AT+CFUN=0) .........................................44
3.6.3
CYCLIC SLEEP mode (AT+CFUN=5, 6, 7 and 8) ................................45
3.6.4
Timing of the /CTS signal in CYCLIC SLEEP modes ...........................45
3.6.5
Wake up MC55/56 from SLEEP mode .................................................47
3.7 Summary of state transitions (except SLEEP mode)..........................................48
3.8 RTC backup .......................................................................................................49
3.9 Serial interfaces .................................................................................................50
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3.9.1
Features supported on first and second serial interface .......................51
3.10 Audio interfaces .................................................................................................53
3.10.1 Microphone circuit ................................................................................54
3.10.2 Speech processing ...............................................................................55
3.10.3 DAI timing.............................................................................................55
3.11 SIM interface......................................................................................................57
3.11.1 Requirements for using the CCIN pin ...................................................58
3.11.2 Design considerations for SIM card holder ...........................................59
3.12 Control signals ...................................................................................................60
3.12.1 Inputs ...................................................................................................60
3.12.2 Outputs.................................................................................................61
3.12.2.1 Synchronization signal .........................................................61
3.12.2.2 Using the SYNC pin to control a status LED ........................62
3.12.2.3 Behaviour of the /RING0 line (ASC0 interface only).............63
Antenna interface ......................................................................................................64
4.1 Antenna installation............................................................................................64
4.1.1
Antenna pad .........................................................................................66
4.1.1.1 Suitable cable types ..................................................................66
4.1.2
Hirose antenna connector ....................................................................67
Electrical, reliability and radio characteristics .......................................................71
5.1 Absolute maximum ratings .................................................................................71
5.2 Operating temperatures .....................................................................................71
5.3 Electrical specifications of the application interface............................................72
5.4 Power supply ratings..........................................................................................76
5.4.1
Current consumption during transmit burst...........................................77
Electrical characteristics of the voiceband part............................................................82
5.4.2
Setting audio parameters by AT commands .........................................82
5.4.3
Audio programming model ...................................................................83
5.4.4
Characteristics of audio modes ............................................................84
5.4.5
Voiceband receive path ........................................................................85
5.4.6
Voiceband transmit path.......................................................................86
5.5 Air interface........................................................................................................87
5.6 Electrostatic discharge .......................................................................................88
5.7 Reliability characteristics ....................................................................................89
Mechanics..................................................................................................................90
6.1 Mechanical dimensions of MC55/56...................................................................90
6.2 Mounting MC55/56 onto the application platform ...............................................92
6.3 Board-to-board connector ..................................................................................93
6.3.1
Mechanical dimensions of the Hirose DF12 connector .........................94
6.3.2
Adapter cabling ....................................................................................94
6.4 Heat sinks and thermally conductive tapes ........................................................95
6.4.1
Test conditions and results...................................................................95
Reference Approval ..................................................................................................97
7.1 Reference Equipment for Type Approval ...........................................................97
7.2 Compliance with FCC Rules and Regulations (MC55 only)................................98
7.3 Compliance with FCC Rules and Regulations (MC56 only)................................99
List of parts and accessories .................................................................................100
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Figures
Figure 1: MC55/56 block diagram ........................................................................................21
Figure 2: Power supply limits during transmit burst ..............................................................26
Figure 3: Power-on by ignition signal....................................................................................28
Figure 4: Timing of power-on process if VDDLP is not used ................................................29
Figure 5: Timing of power-on process if VDDLP is fed from external source........................29
Figure 6: Deactivating GSM engine by /EMERGOFF signal.................................................33
Figure 7: Schematic of approved charging transistor, trickle charging and ESD protection..38
Figure 8: Battery pack circuit diagram ..................................................................................39
Figure 9: Charging process ..................................................................................................41
Figure 10: Timing of /CTS signal (example for a 2.12 s paging cycle)..................................46
Figure 11: Beginning of power saving if CFUN=5 or 7..........................................................46
Figure 12: RTC supply from capacitor ..................................................................................49
Figure 13: RTC supply from rechargeable battery................................................................49
Figure 14: RTC supply from non-chargeable battery............................................................49
Figure 15: Serial interfaces ..................................................................................................50
Figure 16: Audio block diagram............................................................................................53
Figure 17: Schematic of microphone inputs .........................................................................54
Figure 18: DAI timing on transmit path .................................................................................56
Figure 19: DAI timing on receive path ..................................................................................56
Figure 20: SIM card holder of DSB45 Support Box ..............................................................59
Figure 21: Pin numbers of Molex SIM card holder on DSB45 Support Box ..........................59
Figure 22: SYNC signal during transmit burst ......................................................................61
Figure 23: LED Circuit (Example) .........................................................................................62
Figure 24: Incoming voice call ..............................................................................................63
Figure 25: Incoming data call ...............................................................................................63
Figure 26: URC transmission ...............................................................................................63
Figure 27: U.FL-R-SMT connector .......................................................................................64
Figure 28: Antenna pad and GND plane ..............................................................................64
Figure 29: Never use antenna connector and antenna pad at the same time.......................65
Figure 30: Restricted area around antenna pad ...................................................................65
Figure 31: Mechanical dimensions of U.FL-R-SMT connector..............................................67
Figure 32: U.FL-R-SMT connector with U.FL-LP-040 plug ...................................................68
Figure 33: U.FL-R-SMT connector with U.FL-LP-066 plug ...................................................68
Figure 34: Specifications of U.FL-LP-(V)-040(01) plug .........................................................69
Figure 35: Pin assignment (top view on MC55) ....................................................................72
Figure 36: Typical current consumption vs. power control level............................................80
Figure 37: Typical current consumption vs. return loss.........................................................81
Figure 38: AT audio programming model .............................................................................83
Figure 39: MC55/56 – top view.............................................................................................90
Figure 40: Mechanical dimensions of MC55/56 ....................................................................91
Figure 41: MC55/56 bottom view..........................................................................................92
Figure 42: Hirose DF12C receptacle on MC55/56 ................................................................93
Figure 43: Header Hirose DF12 series .................................................................................93
Figure 44: Mechanical dimensions of Hirose DF12 connector ..............................................94
Figure 45: Reference equipment for approval ......................................................................97
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Tables
Table 1: MC55/56 key features ............................................................................................17
Table 2: Coding schemes and maximum net data rates over air interface ...........................19
Table 3: Overview of operating modes .................................................................................23
Table 4: Power supply pins of board-to-board connector .....................................................25
Table 5: AT commands available in Alarm mode .................................................................30
Table 6: Temperature dependent behaviour.........................................................................35
Table 7: Bill of material for external charging circuit .............................................................38
Table 8: Specifications of XWODA battery pack ..................................................................40
Table 9: Comparison Charge-only and Charge mode ..........................................................42
Table 10: AT commands available in Charge-only mode......................................................43
Table 11: Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes............................47
Table 12: State transitions of MC55/56 (except SLEEP mode) ............................................48
Table 13: DCE-DTE wiring of 1st serial interface .................................................................51
Table 14: DCE-DTE wiring of 2nd serial interface ................................................................52
Table 15: Signals of the SIM interface (board-to-board connector) ......................................57
Table 16: Pin assignment of Molex SIM card holder on DSB45 Support Box .......................59
Table 17: Input control signals of the MC55/56 module........................................................60
Table 18: MC55/56 synchronization signal (if SYNC pin is set to mode 0 via AT^SSYNC)...61
Table 19: Coding of the status LED......................................................................................62
Table 20: MC55/56 ring signal..............................................................................................63
Table 21: Return loss ...........................................................................................................64
Table 22: Product specifications of U.FL-R-SMT connector .................................................67
Table 23: Material and finish of U.FL-R-SMT connector and recommended plugs...............68
Table 24: Ordering information for Hirose U.FL Series.........................................................70
Table 25: Absolute maximum ratings ...................................................................................71
Table 26: Operating temperatures........................................................................................71
Table 27: Electrical description of application interface ........................................................73
Table 28: Power supply ratings ............................................................................................76
Table 29: Audio parameters adjustable by AT command .....................................................82
Table 30: Voiceband characteristics (typical) .......................................................................84
Table 31: Voiceband receive path ........................................................................................85
Table 32: Voiceband transmit path.......................................................................................86
Table 33: Air Interface..........................................................................................................87
Table 34: Measured electrostatic values ..............................................................................88
Table 35: Summary of reliability test conditions....................................................................89
Table 36: Ordering information DF12 series.........................................................................93
Table 37: Electrical and mechanical characteristics of the Hirose DF12C connector............93
Table 38: Tested heat sinks and thermally conductive tapes and test results ......................96
Table 39: List of parts and accessories ..............................................................................100
Table 40: Molex sales contacts (subject to change) ...........................................................101
Table 41: Hirose sales contacts (subject to change) ..........................................................101
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0 Document History
Preceding document: "MC55/56 Hardware Interface Description" Version 01.03
New document: "MC55/56 Hardware Interface Description" Version 01.03a
Chapter
Page
What is new
7.2, 7.3
98, 99
Corrected MC55 and MC56 specific information on FFC compliance
Preceding document: "MC55/56 Hardware Interface Description" Version 01.02
New document: "MC55/56 Hardware Interface Description" Version 01.03
Chapter
Page
What is new
1.3
12
Note on necessary FCC certification added.
Updated document: "MC55/56 Hardware Interface Description" Version 01.02
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1 Introduction
This document describes the hardware interface of the Siemens MC55/56 module that
connects to the cellular device application and the air interface. As MC55/56 is intended to
integrate with a wide range of application platforms, all functional components are described
in great detail.
This guide therefore covers all information needed to design and set up cellular applications
incorporating the MC55/56 module. It aids rapid retrieval of interface specifications, electrical
and mechanical details and information on the requirements to be considered for integration
of further components.
1.1
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
Related documents
MC55/56 AT Command, Version 01.02
MC55/56 Release Notes, Version 01.02
GPRS Startup User's Guide
Remote-SAT User's Guide
DSB45 Support Box - Evaluation Kit for Siemens Cellular Engines
Application Note 23: Installing MC55/56 on DSB45
Application Note 16: Upgrading MC45 Firmware, Version 0.5
Application Note 14: Audio and Battery Parameter Download
Application Note 02: Audio Interface Design
Multiplexer User's Guide
Multiplex Driver Developer’s Guide for Windows 2000 and Windows XP
Multiplex Driver Installation Guide for Windows 2000 and Windows XP
Application Note 22: Using TTY / CTM equipment with MC45
Application Note 24: Application Developer’s Guide
Prior to using the MC55/56 engines or upgrading to a new firmware release, be sure to
carefully read the latest product information.
To visit the Siemens Website you can use the following link:
http://www.siemens.com/wm
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Terms and abbreviations
Abbreviation
Description
ADC
Analog-to-Digital Converter
AFC
Automatic Frequency Control
AGC
Automatic Gain Control
ANSI
American National Standards Institute
ARFCN
Absolute Radio Frequency Channel Number
ARP
Antenna Reference Point
ASC0 / ASC1
Asynchronous Controller. Abbreviations used for first and second serial interface of
MC55/56
ASIC
Application Specific Integrated Circuit
Thermistor Constant
B2B
Board-to-board connector
BER
Bit Error Rate
BTS
Base Transceiver Station
CB or CBM
Cell Broadcast Message
CE
Conformité Européene (European Conformity)
CHAP
Challenge Handshake Authentication Protocol
CPU
Central Processing Unit
CS
Coding Scheme
CSD
Circuit Switched Data
CTS
Clear to Send
DAC
Digital-to-Analog Converter
DAI
Digital Audio Interface
dBm0
Digital level, 3.14dBm0 corresponds to full scale, see ITU G.711, A-law
DCE
Data Communication Equipment (typically modems, e.g. Siemens GSM engine)
DCS 1800
Digital Cellular System, also referred to as PCN
DRX
Discontinuous Reception
DSB
Development Support Box
DSP
Digital Signal Processor
DSR
Data Set Ready
DTE
Data Terminal Equipment (typically computer, terminal, printer or, for example, GSM
application)
DTR
Data Terminal Ready
DTX
Discontinuous Transmission
EFR
Enhanced Full Rate
EGSM
Enhanced GSM
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Abbreviation
Description
EMC
Electromagnetic Compatibility
ESD
Electrostatic Discharge
ETS
European Telecommunication Standard
FCC
Federal Communications Commission (U.S.)
FDMA
Frequency Division Multiple Access
FR
Full Rate
GMSK
Gaussian Minimum Shift Keying
GPRS
General Packet Radio Service
GSM
Global Standard for Mobile Communications
HiZ
High Impedance
HR
Half Rate
I/O
Input/Output
IC
Integrated Circuit
IMEI
International Mobile Equipment Identity
ISO
International Standards Organization
ITU
International Telecommunications Union
kbps
kbits per second
LED
Light Emitting Diode
Li-Ion
Lithium-Ion
Mbps
Mbits per second
MMI
Man Machine Interface
MO
Mobile Originated
MS
Mobile Station (GSM engine), also referred to as TE
MSISDN
Mobile Station International ISDN number
MT
Mobile Terminated
NTC
Negative Temperature Coefficient
OEM
Original Equipment Manufacturer
PA
Power Amplifier
PAP
Password Authentication Protocol
PBCCH
Packet Switched Broadcast Control Channel
PCB
Printed Circuit Board
PCL
Power Control Level
PCM
Pulse Code Modulation
PCN
Personal Communications Network, also referred to as DCS 1800
PCS
Personal Communication System, also referred to as GSM 1900
PDU
Protocol Data Unit
PLL
Phase Locked Loop
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Abbreviation
Description
PPP
Point-to-point protocol
PSU
Power Supply Unit
R&TTE
Radio and Telecommunication Terminal Equipment
RAM
Random Access Memory
RF
Radio Frequency
RMS
Root Mean Square (value)
ROM
Read-only Memory
RTC
Real Time Clock
Rx
Receive Direction
SAR
Specific Absorption Rate
SELV
Safety Extra Low Voltage
SIM
Subscriber Identification Module
SMS
Short Message Service
SRAM
Static Random Access Memory
TA
Terminal adapter (e.g. GSM engine)
TDMA
Time Division Multiple Access
TE
Terminal Equipment, also referred to as DTE
Tx
Transmit Direction
UART
Universal asynchronous receiver-transmitter
URC
Unsolicited Result Code
USSD
Unstructured Supplementary Service Data
VSWR
Voltage Standing Wave Ratio
mo b i l e
Phonebook abbreviations
FD
SIM fixdialing phonebook
LD
SIM last dialling phonebook (list of numbers most recently dialled)
MC
Mobile Equipment list of unanswered MT calls (missed calls)
ME
Mobile Equipment phonebook
ON
Own numbers (MSISDNs) stored on SIM or ME
RC
Mobile Equipment list of received calls
SM
SIM phonebook
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Type approval
MC55/56 is designed to comply with the directives and standards listed below. Please
note that the product is still in a pre-release state and, therefore, type approval and
testing procedures have not yet been completed.
European directives
99/05/EC
“Directive of the European Parliament and of the council of 9 March
1999 on radio equipment and telecommunications terminal
equipment and the mutual recognition of their conformity”, in short
referred to as R&TTE Directive 1999/5/EC
89/336/EC
Directive on electromagnetic compatibility
73/23/EC
Directive on electrical equipment designed for use within certain
voltage limits (Low Voltage Directive)
Standards of North American Type Approval
CFR Title 47
“Code of Federal Regulations, Part 2 and Part 24
(Telecommunications, PCS)”
US Equipment Authorization FCC
UL 60 950
“Product Safety Certification” (Safety requirements)
NAPRD.3
“Overview of PCS Type certification review board
Mobile Equipment Type Certification and IMEI control”
PCS Type Certification Review board (PTCRB)
Standards of European Type Approval
3GPP TS 51.010-1
“Digital cellular telecommunications system (Phase 2); Mobile
Station (MS) conformance specification”.
ETSI EN 301 511
“V7.0.1 (2000-12) Candidate Harmonized European Standard
(Telecommunications series) Global System for Mobile
communications (GSM); Harmonized standard for mobile stations in
the GSM 900 and DCS 1800 bands covering essential requirements
under article 3.2 of the R&TTE directive (1999/5/EC) (GSM 13.11
version 7.0.1 Release 1998)”
GCF-CC
“Global Certification Forum - Certification Criteria”
ETSI EN 301 489-1
“V1.1.1 (2000-09) Candidate Harmonized European Standard
(Telecommunications series) Electro Magnetic Compatibility and
Radio spectrum Matters (ERM); Electro Magnetic Compatibility
(EMC) standard for radio equipment and services; Part 1: Common
Technical Requirements”
ETSI EN 301 489-7
“V1.1.1 (2000-09) Candidate Harmonized European Standard
(Telecommunications series) Electro Magnetic Compatibility and
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Radio spectrum Matters (ERM); Electro Magnetic Compatibility
(EMC) standard for radio equipment and services; Part 7: Specific
conditions for mobile and portable radio and ancillary equipment of
digital cellular radio telecommunications systems (GSM and DCS)”
EN 60 950
Safety of information technology equipment (2000)
Requirements of quality
IEC 60068
DIN EN 60529
Environmental testing
IP codes
Compliance with international rules and regulations
Manufacturers of mobile or fixed devices incorporating MC55/56 modules are advised to
have their completed product tested and approved for compliance with all applicable national
and international regulations. As a tri-band GSM/GPRS engine designed for use on any
GSM network in the world, MC55/56 is required to pass all approvals relevant to operation
on the European and North American markets. For the North American market this includes
the Rules and Regulations of the Federal Communications Commission (FCC) and PTCRB,
for the European market the R&TTE Directives and GCF Certification Criteria must be fully
satisfied.
The FCC Equipment Authorization granted to the MC55/56 Siemens reference application is
valid only for the equipment described in Chapter 7.
SAR requirements specific to handheld mobiles
Mobile phones, PDAs or other handheld transmitters and receivers incorporating a GSM
module must be in accordance with the guidelines for human exposure to radio frequency
energy. This requires the Specific Absorption Rate (SAR) of handheld MC55/56 based
applications to be evaluated and approved for compliance with national and/or international
regulations.
Since the SAR value varies significantly with the individual product design manufacturers are
advised to submit their product for approval if designed for handheld operation. For
European and US markets the relevant directives are mentioned below. It is the
responsibility of the manufacturer of the final product to verify whether or not further
standards, recommendations of directives are in force outside these areas.
Products intended for sale on US markets
ES 59005/ANSI C95.1 Considerations for
evaluation of
human exposure to
Electromagnetic Fields (EMFs) from Mobile Telecommunication
Equipment (MTE) in the frequency range 30MHz-6GHz
Products intended for sale on European markets
EN 50360
Product standard to demonstrate the compliance of mobile phones
with the basic restrictions related to human exposure to
electromagnetic fields (300 MHz - 3 GHz)
Note: Usage of MC55/56 in a handheld or portable application is not allowed without a
new FCC certification.
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Safety precautions
The following safety precautions must be observed during all phases of the operation,
usage, service or repair of any cellular terminal or mobile incorporating MC55/56.
Manufacturers of the cellular terminal are advised to convey the following safety information
to users and operating personnel and to incorporate these guidelines into all manuals
supplied with the product. Failure to comply with these precautions violates safety standards
of design, manufacture and intended use of the product. Siemens AG assumes no liability
for customer failure to comply with these precautions.
When in a hospital or other health care facility, observe the restrictions on the
use of mobiles. Switch the cellular terminal or mobile off, if instructed to do so
by the guidelines posted in sensitive areas. Medical equipment may be
sensitive to RF energy.
The operation of cardiac pacemakers, other implanted medical equipment
and hearing aids can be affected by interference from cellular terminals or
mobiles placed close to the device. If in doubt about potential danger, contact
the physician or the manufacturer of the device to verify that the equipment is
properly shielded. Pacemaker patients are advised to keep their hand-held
mobile away from the pacemaker, while it is on.
Switch off the cellular terminal or mobile before boarding an aircraft. Make
sure it cannot be switched on inadvertently. The operation of wireless
appliances in an aircraft is forbidden to prevent interference with
communications systems. Failure to observe these instructions may lead to
the suspension or denial of cellular services to the offender, legal action, or
both.
Do not operate the cellular terminal or mobile in the presence of flammable
gases or fumes. Switch off the cellular terminal when you are near petrol
stations, fuel depots, chemical plants or where blasting operations are in
progress. Operation of any electrical equipment in potentially explosive
atmospheres can constitute a safety hazard.
Your cellular terminal or mobile receives and transmits radio frequency
energy while switched on. Remember that interference can occur if it is used
close to TV sets, radios, computers or inadequately shielded equipment.
Follow any special regulations and always switch off the cellular terminal or
mobile wherever forbidden, or when you suspect that it may cause
interference or danger.
Road safety comes first! Do not use a hand-held cellular terminal or mobile
when driving a vehicle, unless it is securely mounted in a holder for handsfree
operation. Before making a call with a hand-held terminal or mobile, park the
vehicle.
Handsfree devices must be installed by qualified personnel. Faulty installation
or operation can constitute a safety hazard.
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IMPORTANT!
Cellular terminals or mobiles operate using radio signals and cellular
networks cannot be guaranteed to connect in all conditions. Therefore, you
should never rely solely upon any wireless device for essential
communications, for example emergency calls.
Remember, in order to make or receive calls, the cellular terminal or mobile
must be switched on and in a service area with adequate cellular signal
strength.
Some networks do not allow for emergency calls if certain network services
or phone features are in use (e.g. lock functions, fixed dialling etc.). You may
need to deactivate those features before you can make an emergency call.
Some networks require that a valid SIM card be properly inserted in the
cellular terminal or mobile.
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2 Product concept
Designed for use on any GSM network in the world, Siemens MC55 is a tri-band GSM/GPRS
engine that works on the three frequencies GSM 900 MHz, GSM 1800 MHz and GSM
1900 MHz. MC56 is a tri-band GSM/GPRS engine that works on the three frequencies GSM
850MHz, GSM 1800 MHz and GSM 1900 MHz. MC55/56 features GPRS multislot class 10
and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.
To save space on the application platform, MC55/56 comes as an extremely slim and
compact module. This makes it ideally suited for a broad range of mobile computing devices,
and particularly offers easy integration with smart phones, PDAs, and other handhelds.
The tiny MC55/56 module incorporates all you need to create high-performance GSM/GPRS
solutions: baseband processor, power supply ASIC, complete radio frequency circuit
including a power amplifier and antenna interface. The power amplifier is directly fed from
the supply voltage BATT+. A compact “stacked FLASH / SRAM” device stores the MC55/56
software in the flash memory section, and static RAM section provides the additional storage
capacity required by GPRS connectivity.
The physical interface to the cellular application is made through a board-to-board
connector. It consists of 50 pins, required for controlling the unit, transferring data and audio
signals and providing power supply lines.
MC55/56 comprises two serial interfaces (ASC0 and ASC1) giving you maximum flexibility
for easy integration with the Man-Machine Interface (MMI).
An extremely versatile audio concept offers various audio interfaces, each available on the
board-to-board connector: a digital audio interface (DAI) and two analog audio interfaces.
Using AT commands you can easily switch back and forth and select different audio modes.
The external dual-band or triple-band antenna can be connected optionally to a connector on
the top side or to a pad on the bottom side.
The power saving technique minimizes current consumption to as low as 3mA. In SLEEP
mode, MC55/56 is able to wake up on demand and to resume power saving automatically if
no activity is required.
For battery powered applications, MC55/56 features a charging control which can be used to
charge a Li-Ion battery. The charging circuit must be implemented outside the module on the
application platform.
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MC55/56 key features at a glance
Table 1: MC55/56 key features
Feature
Implementation
Power supply
Single supply voltage 3.3V – 4.8V
Power saving
Minimizes power consumption in SLEEP mode to 3mA
Charging
Supports charging control for Li-Ion battery
Frequency bands
· MC55 Tri-band: EGSM 900, GSM 1800, GSM 1900
· MC56 Tri-band: GSM 850, GSM 1800, GSM 1900
· Compliant to GSM Phase 2/2+
GSM class
Small MS
Transmit power
· Class 4 (2W) at EGSM900 and GSM850
· Class 1 (1W) at GSM1800 and GSM 1900
GPRS connectivity
· GPRS multi-slot class 10
· GPRS mobile station class B
Temperature range
· Normal operation:
· Restricted operation:
Temperature control
and auto switch-off
DATA
-20°C to +55°C
-25°C to -20°C and +55°C to +65°C
· Constant temperature control prevents damage to MC55/56 when the
specified temperature is exceeded. When an emergency call is in
progress the automatic temperature shutdown functionality is
deactivated.
GPRS: · GPRS data downlink transfer: max. 85.6 kbps (see Table 2)
· GPRS data uplink transfer: max. 42.8 kbps (see Table 2)
· Coding scheme: CS-1, CS-2, CS-3 and CS-4
· MC55/56 supports the two protocols PAP (Password Authentication
Protocol) and CHAP (Challenge Handshake Authentication Protocol)
commonly used for PPP connections.
· Support of Packet Switched Broadcast Control Channel (PBCCH) allows
you to benefit from enhanced GPRS performance when offered by the
network operators.
CSD:
· CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps, non-transparent, V.110
· Unstructured
WAP:
SMS
Supplementary
Services
Data
(USSD)
support
· WAP compliant
· MT, MO, CB, Text and PDU mode
· SMS storage: SIM card plus 25 SMS locations in the mobile equipment
· Transmission of SMS alternatively over CSD or GPRS. Preferred mode
can be user-defined.
MMS
MMS compliant
FAX
Group 3: Class 1, Class 2
SIM interface
· Supported SIM card: 3V
· External SIM card reader has to be connected via interface connector
(note that card reader is not part of MC55/56)
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Feature
Implementation
External antenna
Connected via 50 Ohm antenna connector or antenna pad
Audio interfaces
Two analog audio interfaces, one digital audio interface (DAI)
Audio features
Speech codec modes:
· Half Rate (ETS 06.20)
· Full Rate (ETS 06.10)
· Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
· Adaptive Multi Rate (AMR)
Handsfree operation
· Echo cancellation
· Noise reduction
Two serial interfaces:
ASC0, ASC1
· 2.65V level, bi-directional bus for AT commands and data
· ASC0 – full-featured 8-wire serial interface. Supports RTS0/CTS0
hardware handshake and software XON/XOFF flow control. Multiplex
ability according to GSM 07.10 Multiplexer Protocol.
· ASC1 - 4-wire serial interface. Supports RTS1/CTS1 hardware
handshake and software XON/XOFF flow control.
· Baud rate: 300bps ... 230kbps on ASC0 and ASC1
· Autobauding (on ASC0 only) detects 1200, 2400, 4800, 9600, 19200,
38400, 57600, 115200, 230400 bps
Phonebook
management
Supported phonebook types: SM, FD, LD, MC, RC, ON, ME
SIM Application Toolkit
Supports SAT class 3, GSM 11.14 Release 98
Ringing tones
Offers a choice of 7 different ringing tones / melodies, easily selectable with
AT command
Real time clock
Implemented
Timer function
Programmable via AT command
Support of TTY/CTM
To benefit from TTY communication via GSM, CTM equipment can be
connected to one of the three audio interfaces.
Physical characteristics
Size:
35+0.15 x 32.5+0.15 x 3.1+0.3 mm (including application
connector)
35+0.15 x 32.5+0.15
application connector)
Weight:
2.8+0.2
mm
(excluding
5.5g
Firmware upgrade
Firmware upgradable over serial interface and SIM interface
Evaluation kit
The DSB45 Support Box is an evaluation kit designed to test and type
approve Siemens cellular engines and provide a sample configuration for
application engineering. See Chapter 8 for ordering information.
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Table 2: Coding schemes and maximum net data rates over air interface
Coding scheme
1 Timeslot
2 Timeslots
4 Timeslots
CS-1:
9.05 kbps
18.1 kbps
36.2 kbps
CS-2:
13.4 kbps
26.8 kbps
53.6 kbps
CS-3:
15.6 kbps
31.2 kbps
62.4 kbps
CS-4:
21.4 kbps
42.8 kbps
85.6 kbps
Please note that the values stated above are maximum ratings which, in practice, are influenced by a
great variety of factors, primarily, for example, traffic variations and network coverage.
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Circuit concept
Figure 1 shows a block diagram of the MC55/56 module and illustrates the major functional
components:
GSM / GPRS baseband block:
· Baseband controller operating at 26MHz
· Power supply ASIC
· Stacked Flash / SRAM
· Application interface (board-to-board connector)
GSM RF block:
· Skyworks RF transceiver
· Skyworks RF power amplifier / FEM
· RF front end (antenna connector)
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BS2
CCVCC
6 SIM I/O
TX_RX
CCIN
SKY77500 PA / FEM
PMB7850 Controller
RXI/Q
DAI
EPP
MIC
Measuring
Network
RFCTRL
ASC1
BATTTEMP
26MHz
26.0
MHz
SIM
8 ASC0
TXI/Q
SKY74963 Transceiver
BATT-TEMP
Application Interface
TX DCS/PCS
TX GSM
RX DCS
RX PCS
RX GSM
PAC_EN
Add. / Data / Control
Stacked FLASH / SRAM
VDD_LP
LOWVDD
/IGT
/EMERGOFF
DO767BA Power Supply ASIC
POWER
CHARGE
BATT+
POWER
Ext.
Charging
Circuit
BATT+
NTC
GND
Figure 1: MC55/56 block diagram
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3 Application Interface
MC55/56 is equipped with a 50-pin 0.5mm pitch board-to-board connector that connects to
the cellular application platform. The host interface incorporates several sub-interfaces
described in the following chapters:
· Power supply and charging control (see Chapters 3.2 and 3.3)
· Dual serial interface (see Chapter 3.9)
· Two analog audio interfaces and a digital audio interface (see Chapter 3.10)
· SIM interface (see Chapter 3.11)
Electrical and mechanical characteristics of the board-to-board connector are specified in
Chapter 6.3. Ordering information for mating connectors and cables are included.
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Operating modes
The table below briefly summarizes the various operating modes referred to in the following
chapters.
Table 3: Overview of operating modes
Mode
Function
Normal operation
GSM / GPRS SLEEP
Various powersave
command.
modes
set
with
AT+CFUN
Software is active to minimum extent. If the module was
registered to the GSM network in IDLE mode, it is
registered and paging with the BTS in SLEEP mode,
too. Power saving can be chosen at different levels: The
NON-CYCLIC SLEEP mode (AT+CFUN=0) disables the
AT interface. The CYCLIC SLEEP modes AT+CFUN=5,
6, 7 and 8 alternatively activate and deactivate the AT
interfaces to allow permanent access to all AT
commands.
POWER DOWN
GSM IDLE
Software is active. Once registered to the GSM network,
paging with BTS is carried out. The module is ready to
send and receive.
GSM TALK
Connection between two subscribers is in progress.
Power consumption depends on network coverage
individual settings, such as DTX off/on, FR/EFR/HR,
hopping sequences, antenna.
GPRS IDLE
Module is ready for GPRS data transfer, but no data is
currently sent or received. Power consumption depends
on network settings and GPRS configuration (e.g.
multislot settings).
GPRS DATA
GPRS data transfer in progress. Power consumption
depends on network settings (e.g. power control level),
uplink / downlink data rates and GPRS configuration
(e.g. used multislot settings).
Normal shutdown after sending the AT^SMSO command.
The Power Supply ASIC (PSU-ASIC) disconnects the supply voltage from the
baseband part of the circuit. Only a voltage regulator in the PSU-ASIC is active
for powering the RTC. Software is not active. The serial interfaces are not
accessible.
Operating voltage (connected to BATT+) remains applied.
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Mode
Function
Alarm mode
Restricted operation launched by RTC alert function while the module is in
POWER DOWN mode. Module will not be registered to GSM network. Limited
number of AT commands is accessible.
If application is battery powered: No charging functionality in Alarm mode.
Charge-only mode
Limited operation for battery powered applications. Enables charging while
module is detached from GSM network. Limited number of AT commands is
accessible. There are several ways to launch Charge-only mode:
· From POWER DOWN mode: Connect charger to the charger input pin of the
external charging circuit and the module’s POWER pin when MC55/56 was
powered down by AT^SMSO.
· From Normal mode: Connect charger to the charger input pin of the external
charging circuit and the module’s POWER pin, then enter AT^SMSO.
Charge mode
during normal
operation
Normal operation (SLEEP, IDLE, TALK, GPRS IDLE, GPRS DATA) and
charging running in parallel. Charge mode changes to Charge-only mode when
the module is powered down before charging has been completed.
See Table 11 and Table 12 for the various options of waking up MC55/56 and proceeding from one
mode to another.
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Power supply
The power supply of MC55/56 has to be a single voltage source of VBATT+= 3.3V...4.8V. It
must be able to provide sufficient current in a transmit burst which typically rises to 2A.
Beyond that, the power supply must be able to account for increased current consumption if
the module is exposed to inappropriate conditions, for example antenna mismatch. For
further details see Chapters 3.2.2 and 5.4.1.
All the key functions for supplying power to the device are handled by an ASIC power
supply. The ASIC provides the following features:
· Stabilizes the supply voltages for the GSM baseband using low drop linear voltage
regulators.
· Controls the module's power up and power down procedures.
A watchdog logic implemented in the baseband processor periodically sends signals to
the ASIC, allowing it to maintain the supply voltage for all digital MC55/56 components.
Whenever the watchdog pulses fail to arrive constantly, the module is turned off.
· Delivers, across the VDD pin, a regulated voltage of 2.9V. The output voltage VDD may
be used to supply, for example, an external LED or a level shifter. However, the external
circuitry must not cause any spikes or glitches on voltage VDD. This voltage is not
available in POWER DOWN mode. Therefore, the VDD pin can be used to indicate
whether or not MC55/56 is in POWER DOWN mode.
· Provides power to the SIM interface.
The RF power amplifier is driven directly from BATT+.
3.2.1 Power supply pins on the board-to-board connector
Five BATT+ pins of the board-to-board connector are dedicated to connect the supply
voltage, five GND pins are recommended for grounding. The values stated below must be
measured directly at the reference points on the MC55/56 board (TP BATT+ and TP GND
illustrated in Figure 41).
The POWER and CHARGE pins serve as control signals for charging a Li-Ion battery.
VDDLP can be used to back up the RTC.
Table 4: Power supply pins of board-to-board connector
Signal name
I/O
Description
Parameter
BATT+
I/O
Positive operating voltage
3.3 V...4.8 V, Ityp £ 2 A during transmit burst
Reference points are the
test points
The minimum operating voltage must not fall
below 3.3 V, not even in case of voltage drop.
0V
GND
Ground
POWER
This line signals to the
processor that the charger
is connected.
CHARGE
Control signal for external
charging transistor
VDDLP
I/O
Can be used to back up the
RTC when VBATT+ is not
applied.
See Chapter 3.8
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UOUT,max < VBATT+
UIN = 2.0 V...5.5 V
Ri = 1kW
Iin,max = 30µA
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3.2.2 Minimizing power losses
When designing the power supply for your application please pay specific attention to power
losses. Ensure that the input voltage VBATT+ never drops below 3.3 V on the MC55/56 board,
not even in a transmit burst where current consumption can rise to typical peaks of 2A. Any
voltage drops that may occur in a transmit burst should not exceed 400mV. It should be
noted that MC55/56 switches off when exceeding these limits. For further details see
Chapter 5.4.
The best approach to reducing voltage drops is to use a board-to-board connection as
recommended, and a low impedance power source. The resistance of the power supply lines
on the host board and of a battery pack should also be considered.
Note:
If the application design requires an adapter cable between both board-to-board
connectors, use a flex cable as short as possible in order to minimize power
losses.
Example: If the length of the flex cable reaches the maximum length of 200mm, this
connection may cause, for example, a resistance of 50mΩ in the BATT+ line and
50mΩ in the GND line. As a result, a 2A transmit burst would add up to a total
voltage drop of 200mV. Plus, if a battery pack is involved, further losses may
occur due to the resistance across the battery lines and the internal resistance of
the battery.
Figure 2: Power supply limits during transmit burst
The input voltage VBATT+ must be measured directly at the test points on the MC55/56 board
(TP BATT+ and TP GND illustrated in Figure 41).
3.2.3 Monitoring power supply
To help you monitor the supply voltage you can use the AT^SBV command which returns the
voltage measured at TP BATT+ and GND.
The voltage is continuously measured at intervals depending on the operating mode on the
RF interface. The duration of measuring ranges from 0.5s in TALK/DATA mode to 50s when
MC55/56 is deregistered. The displayed voltage (in mV) is averaged over the last measuring
period before the AT^SBV command was executed.
For details please refer to [1].
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Power up / down scenarios
In general, be sure not to turn on MC55/56 while it is out of the operating range of voltage
and temperature stated in Chapters 5.2 and 5.3. MC55/56 would immediately switch off after
having started and detected these inappropriate conditions.
3.3.1 Turn on MC55/56
MC55/56 can be activated in a variety of ways, which are described in the following chapters:
· via ignition line /IGT: starts normal operating state (see Chapters 3.3.1.1 and 3.3.1.2)
· via POWER line: starts charging algorithm (see Chapters 3.5.3 and 3.3.1.3)
· via RTC interrupt: starts Alarm mode (see Chapter 3.3.1.4)
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3.3.1.1 Turn on MC55/56 using the ignition line /IGT (Power on)
To switch on MC55/56 the /IGT (Ignition) signal needs to be driven to ground level for at
least 100ms and not earlier than 10ms after the last falling edge of VDD. This can be
accomplished using an open drain/collector driver in order to avoid current flowing into this
pin.
BATT+
min. 10ms
HiZ
min.
100ms
HiZ
/IGT
ca. 60ms
VDD
/TXD0
/TXD1
/DSR0
/EMERGOFF
Serial interfaces
ASC0 and ASC1
Software
controlled
Undefined
ca. 300ms
Inactive
Active
ca. 900ms
For details please see Chapter 3.3.1.2
Figure 3: Power-on by ignition signal
If configured to a fix baud rate, MC55/56 will send the result code ^SYSSTART to indicate
that it is ready to operate. This result code does not appear when autobauding is active. See
Chapter AT+IPR in [1].
In a battery operated MC55/56 application, the duration of the /IGT signal must be 1s
minimum when the charger is connected and you may want to go from charging to Normal
mode.
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3.3.1.2 Timing of the ignition process
When designing your application platform take into account that powering up MC55/56
requires the following steps.
· The ignition line cannot be operated until VBATT+ passes the level of 3.0V.
· The ignition line shall not be operated earlier than 10ms after the last falling edge of VDD.
· 10ms after VBATT+ has reached 3.0V the ignition line can be switched low. The duration of
the falling edge must not exceed 1ms.
· Another 100ms are required to power up the module.
· Ensure that VBATT+ does not fall below 3.0V while the ignition line is driven. Otherwise the
module cannot be activated.
· If the VDDLP line is fed from an external power supply as explained in Chapter 3.8, the
/IGT line is HiZ before the rising edge of BATT+.
3.0V
BATT+
0V
HiZ
HiZ
/IGT
10ms
min. 100ms
max. 1ms
Figure 4: Timing of power-on process if VDDLP is not used
3.0V
BATT+
0V
HiZ
HiZ
/IGT
10ms
min. 100ms
max. 1ms
Figure 5: Timing of power-on process if VDDLP is fed from external source
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3.3.1.3 Turn on MC55/56 using the POWER signal
As detailed in Chapter 3.5.3, the charging adapter can be connected regardless of the
module’s operating mode (except for Alarm mode).
If the charger is connected to the charger input of the external charging circuit and the
module’s POWER pin while MC55/56 is off, processor controlled fast charging starts (see
Chapter 3.5.2). MC55/56 enters a restricted mode, referred to as Charge-only mode where
only the charging algorithm will be launched.
During the Charge-only mode MC55/56 is neither logged on to the GSM network nor are the
serial interfaces fully accessible. To switch to normal operation and log on to the GSM
network, the /IGT line needs to be activated.
3.3.1.4 Turn on MC55/56 using the RTC (Alarm mode)
Another power-on approach is to use the RTC, which is constantly supplied with power from
a separate voltage regulator in the power supply ASIC. The RTC provides an alert function,
which allows the MC55/56 to wake up whilst the internal voltage regulators are off. To
prevent the engine from unintentionally logging into the GSM network, this procedure only
enables restricted operation, referred to as Alarm mode. It must not be confused with a
wake-up or alarm call that can be activated by using the same AT command, but without
switching off power.
Use the AT+CALA command to set the alarm time. The RTC retains the alarm time if
MC55/56 was powered down by AT^SMSO. Once the alarm is timed out and executed,
MC55/56 enters into the Alarm mode. This is indicated by an Unsolicited Result Code (URC)
which reads:
^SYSSTART ALARM MODE
Note that this URC is the only indication of the Alarm mode and will not appear when
autobauding was activated (due to the missing synchronization between DTE and DCE upon
start-up). Therefore, it is recommended to select a fixed baudrate before using the Alarm
mode. In Alarm mode only a limited number of AT commands is available. For further
instructions refer to the AT Command Set.
Table 5: AT commands available in Alarm mode
AT command
Use
AT+CALA
Set alarm time
AT+CCLK
Set date and time of RTC
AT^SBC
In Alarm mode, you can only query the present current consumption and check
whether or not a charger is connected. The battery capacity is returned as 0,
regardless of the actual voltage (since the values measured directly on the cell are
not delivered to the module).
AT^SCTM
Query temperature range, enable/disable URCs to report critical temperature ranges
AT^SMSO
Power down GSM engine
For the GSM engine to change from the Alarm mode to full operation (normal operating
mode) it is necessary to drive the ignition line to ground. This must be implemented in your
host application as described in Chapter 3.3.1.1.
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If your application is battery powered note that charging cannot be started while the engine
is in Alarm mode, i.e. charging will not begin even though the charger connects to the
charger input of the external charging circuit and the module’s POWER pin. See also
Chapter 3.7 which summarizes the various options of changing the mode of operation.
If your host application uses the SYNC pin to control a status LED as described in Chapter
3.12.2.2, please note that the LED is off while the GSM engine is in Alarm mode.
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3.3.2 Turn off MC55/56
To switch the module off the following procedures may be used:
·
Normal shutdown procedure: Software controlled by sending the AT^SMSO command
over the serial application interface. See Chapter 3.3.2.1.
·
Emergency shutdown: Hardware driven by switching the /EMERGOFF line of the boardto-board-connector to ground = immediate shutdown of supply voltages, only applicable
if the software controlled procedure fails! See Chapter 3.3.2.3.
·
Automatic shutdown: See Chapter 3.3.3
a) Takes effect if undervoltage is detected.
b) Takes effect if MC55/56 board temperature exceeds critical limit.
3.3.2.1 Turn off MC55/56 using AT command
The best and safest approach to powering down MC55/56 is to issue the AT^SMSO
command. This procedure lets MC55/56 log off from the network and allows the software to
enter into a secure state and safe data before disconnecting the power supply. The mode is
referred to as POWER DOWN mode. In this mode, only the RTC stays active.
Before switching off the device sends the following response:
^SMSO: MS OFF
OK
^SHUTDOWN
After sending AT^SMSO do not enter any other AT commands. There are two ways to verify
when the module turns off:
· Wait for the URC “^SHUTDOWN”. It indicates that all important data have been stored to
the Flash and that the complete system turns off in less than 1 second.
· Also, you can monitor the VDD pin. The low state of VDD definitely indicates that the
module is switched off.
Be sure not to disconnect the operating voltage VBATT+ before the URC “^SHUTDOWN” has
been issued and the VDD signal has gone low. Otherwise you run the risk of losing data. To
avoid any problems the VDD pin it is recommended to use to monitor the POWER DOWN
state.
While MC55/56 is in POWER DOWN mode the application interface is switched off and
must not be fed from any other source. Therefore, your application must be designed to
avoid any current flow into any digital pins of the application interface.
3.3.2.2 Maximum number of turn-on / turn-off cycles
Each time the module is shut down, data will be written from volatile memory to flash
memory. The guaranteed maximum number of write cycles is limited to 100.000.
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3.3.2.3 Emergency shutdown using /EMERGOFF pin
Caution:
Use the /EMERGOFF pin only when, due to serious problems, the software is
not responding for more than 5 seconds. Pulling the /EMERGOFF pin causes
the loss of all information stored in the volatile memory since power is cut off
immediately. Therefore, this procedure is intended only for use in case of
emergency, e.g. if MC55/56 fails to shut down properly.
The /EMERGOFF signal is available on the board-to-board connector. To control the
/EMERGOFF line it is recommended to use an open drain / collector driver. To turn the GSM
engine off, the /EMERGOFF line has to be driven to ground for ³ 3.2s.
BATT+
/IGT
VDD
Internal reset
max. 3.2s
/EMERGOFF
Controlled by MC55/56
software
Controlled by external application
Figure 6: Deactivating GSM engine by /EMERGOFF signal
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How does it work:
· Voltage Vbatt+ is permanently
applied to the module.
· The module is active while the
internal reset signal is kept at
high level.
During operation of MC55/56
the
baseband
controller
generates watchdog pulses at
regular intervals.
Once the EMERGOFF pin is
grounded
these
watchdog
pulses are cut off from the
power supply ASIC. The power
supply ASIC shuts down the
internal supply voltages of
MC55/56 after max. 3.2s and
the
module
turns
off.
Consequently,
the
output
voltage at VDD is switched off.
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3.3.3 Automatic shutdown
Automatic shutdown takes effect if
· the MC55/56 board is exceeding the critical limits of overtemperature
undertemperature
· the battery is exceeding the critical limits of overtemperature or undertemperature
· undervoltage is detected
or
The automatic shutdown procedure is equivalent to the power-down initiated with the
AT^SMSO command, i.e. MC55/56 logs off from the network and the software enters a
secure state avoiding loss of data. NOTE: This is not true for overvoltage conditions, and if
an unrecoverable hardware or software error occurs, see below for details
Alert messages transmitted before the device switches off are implemented as Unsolicited
Result Codes (URCs). The presentation of these URCs can be enabled or disabled with the
two AT commands AT^SBC and AT^SCTM. The URC presentation mode varies with the
condition, please see Chapters 3.3.3.1 to 3.3.3.4 for details. For further instructions on AT
commands refer to [1].
3.3.3.1 Temperature dependent shutdown
The board temperature is constantly monitored by an internal NTC resistor located on the
PCB. The NTC that detects the battery temperature must be part of the battery pack circuit
as described in Chapter 3.5. The values detected by either NTC resistor are measured
directly on the board or the battery and therefore, are not fully identical with the ambient
temperature.
Each time the board or battery temperature goes out of range or back to normal, MC55/56
instantly displays an alert (if enabled).
· URCs indicating the level "1" or "-1" allow the user to take appropriate precautions, such
as protecting the module from exposure to extreme conditions. The presentation of the
URCs depends on the settings selected with the AT^SCTM write command:
AT^SCTM=1: Presentation of URCs is always enabled.
AT^SCTM=0 (default): Presentation of URCs is enabled for 15 seconds time after
start-up of MC55/56. After 15 seconds operation, the presentation will be disabled,
i.e. no alert messages can be generated.
· URCs indicating the level "2" or "-2" are instantly followed by an orderly shutdown. The
presentation of these URCs is always enabled, i.e. they will be output even though the
factory setting AT^SCTM=0 was never changed.
The maximum temperature ratings are stated in Table 26. Refer to Table 6 for the
associated URCs. All statements are based on test conditions according to IEC 60068-2-2
(still air).
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Table 6: Temperature dependent behaviour
Sending temperature alert (15 s after start-up, otherwise only if URC presentation enabled)
^SCTM_A: 1
Caution: Tamb of battery close to over temperature limit.
^SCTM_B: 1
Caution: Tamb of board close to over temperature limit.
^SCTM_A: -1
Caution: Tamb of battery close to under temperature limit.
^SCTM_B: -1
Caution: Tamb of board close to under temperature limit.
^SCTM_A: 0
Battery back to uncritical temperature range.
^SCTM_B: 0
Board back to uncritical temperature range.
Automatic shutdown (URC appears no matter whether or not presentation was enabled)
^SCTM_A: 2
Alert: Tamb of battery equal or beyond over temperature limit. MC55/56 switches
off.
^SCTM_B: 2
Alert: Tamb of board equal or beyond over temperature limit. MC55/56 switches
off.
^SCTM_A: -2
Alert: Tamb of battery equal or below under temperature limit. MC55/56 switches
off.
^SCTM_B: -2
Alert: Tamb of board equal or below under temperature limit. MC55/56 switches
off.
3.3.3.2 Temperature control during emergency call
If the temperature limit is exceeded while an emergency call is in progress the engine
continues to measure the temperature and to deliver alert messages, but deactivates the
shutdown functionality.
Once the call is terminated the temperature control will be resumed. If the temperature is still
out of range MC55/56 switches off immediately.
3.3.3.3 Undervoltage shutdown if battery NTC is present
In applications where the module’s charging technique is used and an NTC is connected to
the BATT_TEMP terminal, the software constantly monitors the applied voltage. If the
measured battery voltage is no more sufficient to set up a call the following URC will be
presented:
^SBC: Undervoltage.
The message will be reported, for example, when you attempt to make a call while the
voltage is close to the critical limit and further power loss is caused during the transmit burst.
To remind you that the battery needs to be charged soon, the URC appears several times
before the module switches off.
To enable or disable the URC use the AT^SBC command. The URC will be enabled when
you enter the write command and specify the power consumption of your GSM application.
Step by step instructions are provided in [1].
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3.3.3.4 Undervoltage shutdown if no battery NTC is present
The undervoltage protection is also effective in applications, where no NTC connects to the
BATT_TEMP terminal. Thus, you can take advantage of this feature even though the
application handles the charging process or MC55/56 is fed by a fixed supply voltage. All you
need to do is executing the write command AT^SBC= which automatically enables
the presentation of URCs. You do not need to specify .
Whenever the supply voltage falls below the specified value (see Table 28) the URC
^SBC: Undervoltage
appears several times before the module switches off.
3.3.3.5 Overvoltage shutdown
If the supply voltage raises to VBATT+ >5.8V, or an unrecoverable hardware or software error
occurs, the PSU-ASIC immediately cuts off the power supply to all components it is
connected to. In contrast to undervoltage shutdown, loss of data cannot be avoided.
Furthermore, there is no URC function available for overvoltage conditions, i.e. no alert will
be sent prior to shutdown.
Keep in mind that several MC55/56 components are directly linked to BATT+ and, therefore,
power remains applied at major parts of MC55/56. Particular attention must be paid to the
power amplifier which is very sensitive to high voltage and might even be destroyed.
Generally, to avoid that the MC55/56 application violates GSM specifications, be sure that
the supply voltage does not exceed the maximum value of 4.5V stated in Table 28.
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Automatic GPRS Multislot Class change
Temperature control is also effective for operation in GPRS Multislot Class 10. If the board
temperature increases to the limit specified for restricted operation1) while data are
transmitted over GPRS, the module automatically reverts from GPRS Multislot Class 10 (2
Tx) to Class 8 (1Tx). This reduces the power consumption and, consequently, causes the
board’s temperature to decrease. Once the temperature drops to a value of 5 degrees below
the limit of restricted operation, MC55/56 returns to the higher Multislot Class. If the
temperature stays at the critical level or even continues to rise, MC55/56 will not switch back
to the higher class.
After a transition from Multislot Class 10 to Multislot 8 a possible switchback to Multislot
Class 10 is blocked for one minute.
Please note that there is not one single cause of switching over to a lower GPRS Multislot
Class. Rather it is the result of an interaction of several factors, such as the board
temperature that depends largely on the ambient temperature, the operating mode and the
transmit power. Furthermore, take into account that there is a delay until the network
proceeds to a lower or, accordingly, higher Multislot Class. The delay time is network
dependent. In extreme cases, if it takes too much time for the network and the temperature
cannot drop due to this delay, the module may even switch off as described in chapter
3.3.3.1.
1)
See Table 26 for temperature limits known as restricted operation.
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Charging control
MC55/56 integrates a charging management for Li-Ion batteries. You can skip this chapter if
charging is not your concern, or if you are not using the implemented charging algorithm.
MC55/56 has no on-board charging circuit. To benefit from the implemented charging
management you are required to install a charging circuit within your application. In this
case, MC55/56 needs to be powered from a Li-Ion battery pack, e.g. as specified in Table 8.
The module only delivers, via its POWER line and CHARGE line, the control signals needed
to start and stop the charging process. The charging circuit should include a transistor and
should be designed as illustrated in Figure 7. A list of parts recommended for the external
circuit is given in Table 7.
to POWER
Input from
charger
(5.5V - 8V)
under load
1SS355
470R
to BATT+
4V3
pcb spark
gap
/5 ESDA6V1-5W6
CRS04
SI3441DV
BATT_TEMP
100nF
10k
3k3
1/
ESDA6V1-5W6
CHARGE
Figure 7: Schematic of approved charging transistor, trickle charging and ESD protection
Table 7: Bill of material for external charging circuit
Part
Description
SI3441DV
p-chan 2.5V (G-S) MOSFET
VISHAY: SI3441DV-T1
(TSOP-6)
NEC:
1SS355
100mA Si-diode (UMD2)
ROHM:
Toshiba: 1SS352TPH3
CRS04
1A Schottky diode
Toshiba: CRS04
4V3
250mW; 200mA;
4.3V Z-Diode (SOD323)
Philips:
ESDA6V1-5W6
ESD protection TRANSIL™
STM:
array
470R, 3k3, 10k
Resistor, e.g. 0805 or 0603
100nF
Ceramic capacitor 50V
PCB spark gap
0.2mm spark gap on PCB
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1SS355TE-18
PDZ4.3B
ESDA6V1-5W6
Second supplier
UPA1911TE-T1
ROHM:
UDZS4.3B
UDZ4.3B
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3.5.1 Battery pack characteristics
The charging algorithm has been optimised for a Li-Ion battery pack that meets the
characteristics listed below. It is recommended that the battery pack you want to integrate
into your MC55/56 application is compliant with these specifications. This ensures reliable
operation, proper charging and, particularly, allows you to monitor the battery capacity using
the AT^SBC command (see [1] for details). Failure to comply with these specifications might
cause AT^SBC to deliver incorrect battery capacity values. A battery pack especially
designed to operate with MC55/56 modules is specified in Chapter 3.5.1.1.
·
·
·
·
·
·
·
Li-Ion battery pack specified for a maximum charging voltage of 4.2 V and a capacity of
800 mAh. Battery packs with a capacity down to 600 mAh or more than 800 mAh are
allowed, too.
Since charging and discharging largely depend on the battery temperature, the battery
pack should include an NTC resistor. If the NTC is not inside the battery it must be in
thermal contact with the battery. The NTC resistor must be connected between
BATT_TEMP and GND. Required NTC characteristics are: 10 kΩ +5% @ 25°C, B25/85 =
3435K +3% (alternatively acceptable: 10 kΩ +2% @ 25°C, B25/50 = 3370K +3%). Please
note that the NTC is indispensable for proper charging, i.e. the charging process will not
start if no NTC is present.
Ensure that the pack incorporates a protection circuit capable of detecting overvoltage
(protection against overcharging), undervoltage (protection against deep discharging)
and overcurrent. The circuit must be insensitive to pulsed current.
On the MC55/56 module, a built-in measuring circuit constantly monitors the supply
voltage. In the event of undervoltage, it causes MC55/56 to power down. Undervoltage
thresholds are specific to the battery pack and must be evaluated for the intended model.
When you evaluate undervoltage thresholds, consider both the current consumption of
MC55/56 and of the application circuit.
The internal resistance of the battery and the protection should be as low as possible. It
is recommended not to exceed 150mΩ, even in extreme conditions at low temperature.
The battery cell must be insensitive to rupture, fire and gassing under extreme conditions
of temperature and charging (voltage, current).
The battery pack must be protected from reverse pole connection. For example, the
casing should be designed to prevent the user from mounting the battery in reverse
orientation.
The battery pack must be approved to satisfy the requirements of CE conformity.
Figure 8 shows the circuit diagram of a typical to BATT+
battery pack design that includes the
protection elements described above.
to BATT_TEMP
to GND
NTC
Protection Circuit
+ Battery cell
Figure 8: Battery pack circuit diagram
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3.5.1.1 Recommended battery pack
The following battery pack has been especially designed for use with MC55/56 modules.
Table 8: Specifications of XWODA battery pack
Product name, type
XWODA, Li-Ion, 3.6V, 800mAh
Vendor
Shenzhen Xwoda Electronic Co., Ltd
Building C, Tongfukang Industrial Zone
Shiyan Town, Bao’an District
Shenzen
P.R. China
To place orders or obtain more
information please contact:
Contact:
Waichard Tsui
Phone: +86-755-27623789 ext. 370
Fax:
+86-755-27623078
Email: waichard@xwoda.com.cn
Nominal voltage
3.6V
Capacity
800mAh
NTC
10kΩ ± 5% @ 25°C, B (25/85)=3435K ± 3%
Overcharge detection voltage
4.325 ± 0.025V
Overcharge release voltage
4.075 ± 0.025V
Overdischarge detection voltage
2.5 ± 0.05V
Overdischarge release voltage
2.9 ± 0.5V
Overcurrent detection
3 ± 0.5A
Nominal working current
<5µA
Current of low voltage detection
0.5µA
Overcurrent detection delay time
8~16ms
Short detection delay time
50µs
Overdischarge detection delay time
31~125ms
Overcharge detection delay time
1s
Internal resistance
<130mΩ
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3.5.2 Implemented charging technique
If the external charging circuit follows the recommendation of Figure 7, the charging process
consists of trickle charging and processor controlled fast charging. For this solution, the fast
charging current provided by the charger or any other external source must be limited to
500mA.
Trickle charging
· Trickle charging starts when the charger is connected to the charger input of the external
charging circuit and the module’s POWER pin. The charging current depends on the
voltage difference between the charger input of the external charging circuit and BATT+
of the module.
· Trickle charging stops when the battery voltage reaches 3.6V.
Fast charging
· After trickle charging has raised the battery voltage to 3.2V within 60 minutes +10% from
connecting the charger, the power ASIC turns on and wakes up the baseband processor.
Now, processor controlled fast charging begins.
If the battery voltage was already above 3.2V, processor controlled fast charging starts
just after the charger was connected to the charger input of the external charging circuit
and the module’s POWER pin. If MC55/56 was in POWER DOWN mode, it turns on and
enters the Charge-only mode along with fast charging (see also Chapter 3.3.1.3).
· Fast charging delivers a constant current until the battery voltage reaches 4.2V and then
proceeds with varying charge pulses. As shown in Figure 5, the pulse duty cycle is
reduced to adjust the charging procedure and prevent the voltage from overshooting
beyond 4.2V. Once the pulse width reaches the minimum of 100ms and the duty cycle
does not change for 2 minutes, fast charging is completed.
· Fast charging can only be accomplished in a temperature range from 0°C to +45°C.
Voltage
4.3
4.2
3.8
3.4
100ms 2 ... 0.1s
100ms 0.1 ... 2s
3.0
Constant current
tOFF = 100 ms
tON = 100 ms
Time
Figure 9: Charging process
Note:
Do not connect the charger to the BATT+ lines. Only the charger input of the
external charging circuit is intended as input for charging current! The POWER pin
of MC55/56 is the input only for indicating a connected charger!
The battery manufacturer must guarantee that the battery complies with the
described charging technique.
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What to do if software controlled charging does not start up?
If trickle charging fails to raise the battery voltage to 3.2V within 60 minutes +10%, processor
controlled charging does not begin. To start fast charging you can do one of the following:
· Once the voltage has risen above its minimum of 3V, you can try to start software
controlled charging by pulling the /IGT line to ground.
· If the voltage is still below 3V, driving the /IGT line to ground switches the timer off.
Without the timer running, MC55/56 will not proceed to software controlled charging. To
restart the timer you are required to shortly disconnect and reconnect the charger.
3.5.3 Operating modes during charging
Of course, the battery can be charged regardless of the engine's operating mode. When the
GSM engine is in Normal mode (SLEEP, IDLE, TALK, GPRS IDLE or GPRS DATA mode), it
remains operational while charging is in progress (provided that sufficient voltage is applied).
The charging process during the Normal mode is referred to as Charge mode.
If the charger is connected to the charger input of the external charging circuit and the
module’s POWER pin while MC55/56 is in POWER DOWN mode, MC55/56 goes into
Charge-only mode.
Table 9: Comparison Charge-only and Charge mode
Charge-only mode
Charge mode
How to activate mode
Features
Connect charger to charger input of · Battery can be charged while GSM engine
external charging circuit and module’s
remains operational and registered to the
POWER pin while MC55/56 is
GSM network.
·
In IDLE and TALK mode, the serial interfaces
· operating, e.g. in IDLE or TALK mode
are accessible. AT command set can be used
· in SLEEP mode
to full extent.
· In the NON-CYCLIC SLEEP mode, the serial
interfaces are not accessible at all. During the
CYCLIC SLEEP mode it can be used as
described in Chapter 3.6.3.
Connect charger to charger input of · Battery can be charged while GSM engine is
external charging circuit and module’s
deregistered from GSM network.
POWER pin while MC55/56 is
· Charging runs smoothly due to constant
current consumption.
· in POWER DOWN mode
·
The AT interface is accessible and allows to
· in Normal mode: Connect charger to
use the commands listed below.
the
POWER
pin, then enter
AT^SMSO.
IMPORTANT: While trickle charging is in
progress, be sure that the application is
switched off. If the application is fed from
the trickle charge current the module
might be prevented from proceeding to
software controlled charging since the
current would not be sufficient.
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Features of Charge-only mode
Once the GSM engine enters the Charge-only mode, the AT command interface presents an
Unsolicited Result Code (URC) which reads:
^SYSSTART CHARGE-ONLY MODE
Note that this URC will not appear when autobauding was activated (due to the missing
synchronization between DTE and DCE upon start-up). Therefore, it is recommended to
select a fixed baudrate before using the Charge-only mode.
While the Charge-only mode is in progress, you can only use the AT commands listed in
Table 10. For further instructions refer to the AT Command Set supplied with your GSM
engine.
Table 10: AT commands available in Charge-only mode
AT command
Use
AT+CALA
Set alarm time
AT+CCLK
Set date and time of RTC
AT^SBC
Monitor charging process
AT^SCTM
Note: While charging is in progress, no battery capacity value is available. To query
the battery capacity disconnect the charger.
If the charger connects externally to the host device no charging parameters are
transferred to the module. In this case, the command cannot be used.
Query temperature range, enable/disable URCs to report critical temperature ranges
AT^SMSO
Power down GSM engine
To proceed from Charge-only mode to normal operation, it is necessary to drive the ignition
line to ground. This must be implemented in your host application as described in Chapter
3.3.1.1. When the engine is in Alarm mode there is no direct way to start charging, i.e.
charging will not begin even though the charger connects to the charger input of the external
charging circuit and the module’s POWER pin. See also Chapter 3.7 which summarizes the
various options of changing the mode of operation.
If your host application uses the SYNC pin to control a status LED as described in Chapter
3.12.2.2, please note that the LED is off while the GSM engine is in Charge-only mode.
3.5.4 Charger requirements
If you are using the implemented charging technique and the charging circuit recommended
in Figure 7, the charger must be designed to meet the following requirements:
a) Simple transformer power plug
- Output voltage: 5.5V...8V (under load)
- The charge current must be limited to 500mA
- Voltage spikes that may occur while you connect or disconnect the charger must be
limited.
- There must not be any capacitor on the secondary side of the power plug (avoidance of
current spikes at the beginning of charging)
b) Supplementary requirements for a) to ensure a regulated power supply
- When current is switched off a voltage peak of 10V is allowed for a maximum 1ms
- When current is switched on a spike of 1.6A for 1ms is allowed
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Power saving
SLEEP mode reduces the functionality of the MC55/56 module to a minimum and, thus,
minimizes the current consumption to the lowest level. SLEEP mode is set with the
AT+CFUN command which provides the choice of the functionality levels =0, 1, 5, 6, 7
or 8, all explained below. Further instructions of how to use AT+CFUN can be found in [1].
IMPORTANT: The AT+CFUN command can be executed before or after entering PIN1.
Nevertheless, please keep in mind that power saving works only while the module is
registered to the GSM network. If you attempt to activate power saving while the module is
detached, the selected  level will be set, though power saving does not take effect.
To check whether power saving is on, you can query the status of AT+CFUN if you have
chosen CYCLIC SLEEP mode. If available, you can take advantage of the status LED
controlled by the SYNC pin (see Chapter 3.12.2.2). The LED stops flashing once the module
starts power saving.
The wake-up procedures are quite different depending on the selected SLEEP mode. Table
11 compares the wake-up events that can occur in NON-CYCLIC SLEEP mode and in the
four CYCLIC SLEEP modes.
3.6.1 No power saving (AT+CFUN=1)
The functionality level =1 is where power saving is switched off. This is the default after
startup.
3.6.2 NON-CYCLIC SLEEP mode (AT+CFUN=0)
If level 0 has been selected (AT+CFUN=0), the serial interface is blocked. The module
shortly deactivates power saving to listen to a paging message sent from the base station
and then immediately resumes power saving. Level 0 is called NON-CYCLIC SLEEP mode,
since the serial interface is not alternatingly made accessible as in CYCLIC SLEEP mode.
The first wake-up event fully activates the module, enables the serial interface and
terminates the power saving mode. In short, it takes MC55/56 back to the highest level of
functionality =1.
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3.6.3 CYCLIC SLEEP mode (AT+CFUN=5, 6, 7 and 8)
The major benefit over the NON-CYCLIC SLEEP mode is that the serial interface is not
permanently blocked and that packet switched calls may go on without terminating the
selected CYCLIC SLEEP mode. This allows MC55/56 to become active, for example to
perform a GPRS data transfer, and to resume power saving after the GPRS data transfer is
completed.
The four CYCLIC SLEEP modes give you greater flexibility regarding the wake-up
procedures: For example, in all CYCLIC SLEEP modes, you can enter AT+CFUN=1 to
permanently wake up the module. The best choice is using CFUN=7 or 8, since in these
modes MC55/56 automatically resumes power saving, after you have sent or received a
short message or made a call. CFUN=5 and 6 do not offer this feature, and therefore, are
only supported for compatibility with earlier releases. Please refer to Table 11 for a summary
of all modes.
The CYCLIC SLEEP mode is a dynamic process which alternatingly enables and disables
the serial interface. By setting/resetting the /CTS signal, the module indicates to the
application whether or not the UART is active. The timing of the /CTS signal is described
below.
Both the application and the module must be configured to use hardware flow control
(RTS/CTS handshake). The default setting of MC55/56 is AT\Q0 (no flow control) which
must be altered to AT\Q3. See [1] for details.
Note: If both serial interfaces ASC0 and ASC1 are connected, both are synchronized. This
means that SLEEP mode takes effect on both, no matter on which interface the AT
command was issued. Although not explicitly stated, all explanations given in this
chapter refer equally to ASC0 and ASC1, and accordingly to /CTS0 and /CTS1.
3.6.4 Timing of the /CTS signal in CYCLIC SLEEP modes
The /CTS signal is enabled in synchrony with the module’s paging cycle. It goes active low
each time when the module starts listening to a paging message block from the base station.
The timing of the paging cycle varies with the base station. The duration of a paging interval
can be calculated from the following formula:
4.615 ms (TDMA frame duration) * 51 (number of frames) * DRX value.
DRX (Discontinuous Reception) is a value from 2 to 9, resulting in paging intervals from 0.47
to 2.12 seconds. The DRX value of the base station is assigned by the network operator.
Each listening period causes the /CTS signal to go active low: If DRX is 2, the /CTS signal is
activated every 0.47 seconds, if DRX is 3, the /CTS signal is activated every 0.71 seconds
and if DRX is 9, the /CTS signal is activated every 2.1 seconds.
The /CTS signal is active low for 4.6 ms. This is followed by another 4.6 ms UART activity. If
the start bit of a received character is detected within these 9.2 ms, /CTS will be activated
and the proper reception of the character will be guaranteed.
/CTS will also be activated if any character is to be sent.
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After the last character was sent or received the interface will remain active for another
· 2 seconds, if AT+CFUN=5 or 7 or
· 10 minutes, if AT+CFUN=6 or 8.
In the pauses between listening to paging messages, while /CTS is high, the module
resumes power saving and the AT interface is not accessible. See Figure 10 and Figure 11.
Paging message
Paging message
2.12 s
/CTS
Paging message
4.6
ms
4.6
ms
4.6 ms
4.6
ms
4.6
ms
4.6 ms
AT interface disabled
Paging message
2.12 s
2.12 s
4.6 ms
4.6 ms
AT interface enabled
Figure 10: Timing of /CTS signal (example for a 2.12 s paging cycle)
Figure 11 illustrates the CFUN=5 and CFUN=7 modes, which reset the /CTS signal 2
seconds after the last character was sent or received.
Paging message
2.12 s
Paging message
2.12 s
Paging message
2.12 s
Paging message
Beginning of power saving
4.6
ms
/CTS
2s
1st character
4.6 ms
4.6
ms
4.6 ms
4.6 ms
Last character
AT interface disabled
AT interface enabled
Figure 11: Beginning of power saving if CFUN=5 or 7
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3.6.5 Wake up MC55/56 from SLEEP mode
A wake-up event is any event that switches off the SLEEP mode and causes MC55/56 to
return to full functionality. In short, it takes MC55/56 back to AT+CFUN=1.
Definitions of the state transitions described in Table 11:
Yes = MC55/56 exits SLEEP mode.
No = MC55/56 does not exit SLEEP mode.
Table 11: Wake-up events in NON-CYCLIC and CYCLIC SLEEP modes
Event
From SLEEP mode
AT+CFUN=0 to
AT+CFUN=1
From SLEEP mode
AT+CFUN=5 or 6 to
AT+CFUN=1
From SLEEP mode
AT+CFUN=7 or 8 to
AT+CFUN=1
Ignition line
No
No
No
/RTS0 or /RTS1
(falling edge)
Yes1)
No1)
No1)
Unsolicited Result Code
(URC)
Yes
Yes
No
Incoming voice or data call
Yes
Yes
No
Any AT command
(incl. outgoing voice or data
call, outgoing SMS)
Not possible
(UART disabled)
No
No
AT+CNMI=0,0 (= default, no
indication of received SMS)
No
No
No
AT+CNMI=1,1 (= displays
URC upon receipt of SMS)
Yes
Yes
No
GPRS data transfer
Not possible
(UART disabled)
No
No
RTC alarm2)
Yes
Yes
No
AT+CFUN=1
Not possible (UART
disabled)
Yes
Yes
Incoming SMS depending on
mode selected by AT+CNMI:
1)
During all CYCLIC SLEEP modes, /RTS0 and /RTS1 are conventionally used for flow
control: The assertion of /RTS0 or /RTS1 signals that the application is ready to
receive data - without waking up the module. Be aware that this behaviour is different if
CFUN=0: In this case, the assertion of /RTS0 and /RTS1 serves as a wake-up event,
giving the application the possibility to intentionally terminate power saving.
2)
Recommendation: In NON-CYCLIC SLEEP mode, you can set an RTC alarm to wake
up MC55/56 and return to full functionality. This is a useful approach because, in this
mode, the AT interface is not accessible.
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Summary of state transitions (except SLEEP mode)
Table 12: State transitions of MC55/56 (except SLEEP mode)
The table shows how to proceed from one mode to another (grey column = present mode, white columns = intended modes)
Further mode èèè
**)
*)
Normal mode
Charge-only mode
Charging in normal
*)**)
mode
---
/IGT >100 ms at low
level
Connect charger to
input of ext. charging
circuit and POWER pin
(high level at POWER)
No direct transition, but
Wake-up from POWER
via “Charge-only mode” or DOWN mode (if
“Normal mode”
activated with AT+CALA)
/IGT >1 s at low level,
if battery is fully
charged
100ms < /IGT < 500ms
at low level
/IGT >1 s at low level
Present mode
POWER DOWN
mode without charger
POWER DOWN
--mode with charger
(high level at POWER
pins of MC55/56)
**)
Normal mode
Alarm mode
POWER DOWN
Wake-up from POWER
DOWN mode (if
activated with AT+CALA)
AT^SMSO
--or
exceptionally /EMERGOFF
pin > 3.2s at low level
No automatic transition, Connect charger to
but via “POWER
POWER pin at MC55/56
DOWN”
(high level at POWER)
AT+CALA followed by
AT^SMSO. MC55/56
enters Alarm mode when
specified time is reached.
Disconnect charger
(MC55/56 POWER pin at
low level)
or AT^SMSO or
exceptionally /EMERGOFF
pin >3.2s at low level
No automatic
transition, but via
“Charge in Normal
mode”
---
/IGT >1s at low level
AT+CALA followed by
AT^SMSO. MC55/56
enters Alarm mode when
specified time is reached
and VBATT+>3.2V
Charging in normal
*) **)
mode
AT^SMSO è “Charge-only
mode”, again AT^SMSO;
or exceptionally
/EMERGOFF pin >3.2s at
low level
Disconnect charger
from input of ext.
charging circuit and
module’s POWER pin
AT^SMSO
---
No direct transition
Alarm mode
AT^SMSO or
/IGT >100ms at low
exceptionally /EMERGOFF level
pin >3.2s at low level
No transition
/IGT >100ms at low level
---
Charge-only mode
*)
*)
See Chapter 3.5.3 for details on the charging mode
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Normal mode covers TALK, DATA, GPRS, IDLE and SLEEP modes
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RTC backup
The internal Real Time Clock of MC55/56 is supplied from a separate voltage regulator in
the power supply ASIC which is also active when MC55/56 is in POWER DOWN status. An
alarm function is provided that allows to wake up MC55/56 without logging on to the GSM
network.
In addition, you can use the VDDLP pin on the board-to-board connector to backup the RTC
from an external capacitor or a battery (rechargeable or non-chargeable). The capacitor is
charged by the BATT+ line of MC55/56. If the voltage supply at BATT+ is disconnected the
RTC can be powered by the capacitor. The size of the capacitor determines the duration of
buffering when no voltage is applied to MC55/56, i.e. the greater capacitor the longer
MC55/56 will save the date and time.
The following figures show various sample configurations. The voltage applied at VDDLP
can be in the range from 2 to 5.5V. Please refer to Table 27 for the parameters required.
BATT+
Baseband
processor
B2B
PSU
1k
RTC
VDDLP
Figure 12: RTC supply from capacitor
BATT+
Baseband
processor
B2B
PSU
1k
RTC
VDDLP
Figure 13: RTC supply from rechargeable battery
BATT+
Baseband
processor
B2B
PSU
1k
RTC
VDDLP
Figure 14: RTC supply from non-chargeable battery
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Serial interfaces
MC55/56 offers two unbalanced, asynchronous serial interfaces conforming to ITU-T V.24
protocol DCE signalling. The electrical characteristics do not comply with ITU-T V.28. The
significant levels are 0V (for low data bit or ON condition) and 2.65V (for high data bit or OFF
condition). For electrical characteristics please refer to Table 37.
The GSM engine is designed for use as a DCE. Based on the conventions for DCE-DTE
connections it communicates with the customer application (DTE) using the following
signals:
ASC0
· Port /TXD @ application sends data to the module’s /TXD0 signal line
· Port /RXD @ application receives data from the module’s /RXD0 signal line
ASC1
· Port /TXD @ application sends data to module’s /TXD1 signal line
· Port /RXD @ application receives data from the module’s /RXD1 signal line
GSM module
Application
/TXD
/RXD0
/RXD
/RTS0
/RTS
/CTS0
/CTS
/DTR0
/DTR
/DSR0
/DSR
/DCD0
/DCD
/RING0
/RING
/TXD1
/TXD
/RXD1
/RXD
/RTS1
/RTS
/CTS1
/CTS
2nd serial interface
ASC0 interface
ASC1 interface
/TXD0
1st serial interface
(DTE)
(DCE)
Figure 15: Serial interfaces
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3.9.1 Features supported on first and second serial interface
ASC0
· 8-wire serial interface
· Includes the data lines /TXD0 and /RXD0, the status lines /RTS0 and /CTS0 and, in
addition, the modem control lines /DTR0, /DSR0, /DCD0 and /RING0.
· It is primarily designed for voice calls, CSD calls, fax calls and GPRS services and for
controlling the GSM engine with AT commands. Full Multiplex capability allows the
interface to be partitioned into three virtual channels, yet with CSD and fax services only
available on the first logical channel. Please note that when the ASC0 interface runs in
Multiplex mode, ASC1 cannot be used. For more detailed characteristics see [10].
· The /DTR0 signal will only be polled once per second from the internal firmware of
MC55/56.
· The /RING0 signal serves to indicate incoming calls and other types of URCs
(Unsolicited Result Code). It can also be used to send pulses to the host application, for
example to wake up the application from power saving state. For further details see
Chapter 3.12.2.3.
· Autobauding is only selectable on ASC0 and supports the following bit rates: 1200, 2400,
4800, 9600, 19200, 38400, 57600, 115200, 230400 bps.
· Autobauding is not compatible with multiplex mode, see [10].
ASC1
· 4-wire serial interface
· Includes only the data lines /TXD1 and /RXD1 plus /RTS1 and /CTS1 for hardware
handshake. This interface is intended for voice calls, GPRS services and for controlling
the GSM engine with AT commands. It is not suited for CSD calls, fax calls and Multiplex
mode.
· On ASC1 no RING line is available. The indication of URCs on the second interface
depends on the settings made with the AT^SCFG command. For details refer to [1].
ASC0 and ASC1
· Both interfaces are configured for 8 data bits, no parity and 1 stop bit, and can be
operated at bit rates from 300bps to 230400 bps.
· XON/XOFF software flow control can be used on both interfaces (except if power saving
is active).
st
Table 13: DCE-DTE wiring of 1 serial interface
V.24
circuit
DCE
DTE
Pin function
Signal direction
Pin function
Signal direction
103
/TXD0
Input
/TXD
Output
104
/RXD0
Output
/RXD
Input
105
/RTS0
Input
/RTS
Output
106
/CTS0
Output
/CTS
Input
108/2
/DTR0
Input
/DTR
Output
107
/DSR0
Output
/DSR
Input
109
/DCD0
Output
/DCD
Input
125
/RING0
Output
/RING
Input
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Table 14: DCE-DTE wiring of 2nd serial interface
V.24
circuit
DCE
DTE
Pin function
Signal direction
Pin function
Signal direction
103
/TXD1
Input
/TXD
Output
104
/RXD1
Output
/RXD
Input
105
/RTS1
Input
/RTS
Output
106
/CTS1
Output
/CTS
Input
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3.10 Audio interfaces
MC55/56 comprises three audio interfaces available on the board-to-board connector:
· Two analog audio interfaces, each with a balanced analog microphone input and a
balanced analog earpiece output. The second analog interface provides a supply circuit
to feed an active microphone.
· Serial digital audio interface (DAI) using PCM (Pulse Code Modulation) to encode analog
voice signals into digital bit streams.
This means you can connect up to three audio devices in any combination, although
analogue and digital audio must not be operated at the same time. Using the AT^SAIC
command you can easily switch back and forth.
MICP1
MICN1
MICP2
ADC
MICN2
EPP1
EPN1
DAC
EPP2
DSP
Air
Interface
EPN2
SCLK
RXDDAI
RFSDAI
TXDDAI
TFSDAI
Digital
Audio
Interface
(DAI)
Figure 16: Audio block diagram
MC55/56 offers six audio modes which can be selected with the AT^SNFS command, no
matter which of the three interfaces is currently active. The electrical characteristics of the
voiceband part vary with the audio mode. For example, sending and receiving amplification,
sidetone paths, noise suppression etc. depend on the selected mode and can be altered with
AT commands (except for mode 1).
On each audio interface you can use all audio AT commands specified in [1] to alter
parameters. The only exception are the DAC and ADC gain amplifier attenuation
 and  which cannot be modified when the digital audio interface is
used, since in this case the DAC and ADC are switched off.
Please refer to Chapter 3.10 for specifications of the audio interface and an overview of the
audio parameters. Detailed instructions on using AT commands are presented in the
"MC55/56 AT Command Set" [1]. Table 30 on page 84 summarizes the characteristics of the
various audio modes and shows what parameters are supported in each mode.
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When shipped from factory, all audio parameters of MC55/56 are set to interface 1 and
audio mode 1. This is the default configuration optimised for the Votronic HH-SI-30.3/V1.1/0
handset and used for type approving the Siemens reference configuration. Audio mode 1
has fix parameters which cannot be modified. To adjust the settings of the Votronic handset
simply change to another audio mode.
In transmit direction, all audio modes contain internal scaling factors (digital amplification)
that are not accessible by the user. To avoid saturation with a full scale digital input signal on
the DAI, and to obtain a one-to-one digital access to the speech coder in audio mode 5
and 6, it is recommended to set the parameter  of the selected audio mode as
follows:
Audio mode 1 and 4:
23196
Audio mode 2:
17396
Audio mode 3:
21901
Audio mode 5 and 6:
21402
3.10.1
Microphone circuit
Interface 1
This interface has no microphone supply circuit and therefore, has an impedance of 50kW.
When connecting a microphone or another signal source to interface 1 you are required to
add two 100 nF capacitors, one to each line.
Interface 2
This interface comes with a microphone supply circuit and can be used to feed an active
microphone. It has an impedance of 2kW. If you do not use it or if you want to connect
another type of signal source, for example, an op amp or a dynamic microphone, it needs to
be decoupled with capacitors. The power supply can be switched off and on by using the
command AT^SNFM. For details see [1].
Figure 17 shows the microphone inputs at both analog interfaces of MC55/56.
2.65 V
Power down
MICP1
MICN1
Ri=50kΩ
to ADC
1 kΩ
1 kΩ
MICP2
33 µF
MICN2
1 kΩ
1 kΩ
Ri=2kΩ
Figure 17: Schematic of microphone inputs
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Speech processing
The speech samples from the ADC or DAI are handled by the DSP of the baseband
controller to calculate e.g. amplifications, sidetone, echo cancellation or noise suppression
depending on the configuration of the active audio mode. These processed samples are
passed to the speech encoder. Received samples from the speech decoder are passed to
the DAC or DAI after post processing (frequency response correction, adding sidetone etc.).
Full rate, half rate, enhanced full rate, adaptive multi rate (AMR), speech and channel
encoding including voice activity detection (VAD) and discontinuous transmission (DTX) and
digital GMSK modulation are also performed on the GSM baseband processor.
Customer specific audio parameters can be evaluated and supplied by Siemens on request.
These parameters can be downloaded to MC55/56 using an AT command. For further
information refer to [8] or contact your Siemens distributor.
3.10.3
DAI timing
To support the DAI function, MC55/56 integrates a simple five-line serial interface with one
input data clock line (SCLK) and input / output data and frame lines (TXDDAI, TFSDAI,
RXDDAI, RFSDAI).
The serial interface is always active if the external input data clock SLCK is present, i.e. the
serial interface is not clocked by the DSP of the MC55/56 baseband processor. SLCK must
be supplied from the application and can be in a frequency range between 0.2 and 10 MHz.
Serial transfer of 16-bit words is done in both directions.
Data transfer to the application is initiated by the module through a short pulse of TFSDAI.
The duration of the TFSDAI pulse is one SCLK period, starting at the rising edge of SLCK.
During the following 16 SLCK cycles, the 16-bit sample will be transferred on the TXDDAI
line. The next outgoing sample will be transferred after the next TFSDAI pulse which occurs
every 125 µs.
The TFSDAI pulse is the master clock of the sample transfer. From the rising edge of the
TFSDAI pulse, the application has 100 µs to transfer the 16-bit input sample on the RXDDAI
line. The rising edge of the RFSDAI pulse (supplied by the application) may coincide with the
falling edge of TFSDAI or occur slightly later - it is only significant that, in any case, the
transfer of the LSB input sample will be completed within the specified duration of 100 µs.
Audio samples are transferred from the module to the application in an average of 125µs.
This is determined by the 8kHz sampling rate, which is derived from and synchronized to the
GSM network. As SLCK is independent of the GSM network, the distance between two
succeeding sample transfers may vary about + 1 SLCK period.
The application is required to adapt its sampling rate to the TFSDAI rate. Failure to
synchronize the timing between the module and the application may cause audible pops and
clicks in a conversation. The timing characteristics of both data transfer directions are shown
in Figure 18 and Figure 19.
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Before starting the data transfer the clock SCLK should be available for at least
three cycles.
After the transfer of the LSB0 the clock SCLK should be still available for at least
three cycles.
SLCK
(input)
Internal
signal
T = 100ns to 5,000 ns
RFSDAI
(input)
RXDDAI
(input)
Flag
Figure 18: DAI timing on transmit path
SLCK
(input)
T = 100ns to 5,000 ns
Internal
signal
TFSDAI
(output)
TXDDAI
(output)
Flag
Figure 19: DAI timing on receive path
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3.11 SIM interface
The baseband processor has an integrated SIM interface compatible with the ISO 7816 IC
Card standard. This is wired to the host interface (board-to-board connector) in order to be
connected to an external SIM card holder. Six pins on the board-to-board connector are
reserved for the SIM interface.
The CCIN pin serves to detect whether a tray (with SIM card) is present in the card holder.
Using the CCIN pin is mandatory for compliance with the GSM 11.11 recommendation if the
mechanical design of the host application allows the user to remove the SIM card during
operation. See Chapter 3.11.1 for details.
It is recommended that the total cable length between the board-to-board connector pins on
MC55/56 and the pins of the SIM card holder does not exceed 200 mm in order to meet the
specifications of 3GPP TS 51.010-1 and to satisfy the requirements of EMC compliance.
Table 15: Signals of the SIM interface (board-to-board connector)
Signal
Description
CCGND
Separate ground connection for SIM card to improve EMC.
CCCLK
Chipcard clock, various clock rates can be set in the baseband processor.
CCVCC
SIM supply voltage from PSU-ASIC
CCIO
Serial data line, input and output.
CCRST
Chipcard reset, provided by baseband processor.
CCIN
Input on the baseband processor for detecting a SIM card tray in the holder.
The CCIN pin is mandatory for applications that allow the user to remove the SIM card
during operation.
The CCIN pin is solely intended for use with a SIM card. It must not be used for any other
purposes. Failure to comply with this requirement may invalidate the type approval of
MC55/56.
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Requirements for using the CCIN pin
According to ISO/IEC 7816-3 the SIM interface must be immediately shut down once the
SIM card is removed during operation. Therefore, the signal at the CCIN pin must go low
before the SIM card contacts are mechanically detached from the SIM interface contacts.
This shut-down procedure is particularly required to protect the SIM card as well as the SIM
interface of MC55/56 from damage.
An appropriate SIM card detect switch is required on the card holder. For example, this is
true for the model supplied by Molex, which has been tested to operate with MC55/56 and is
part of the Siemens reference equipment submitted for type approval. Molex ordering
number is 91228-0001, see also Chapter 8.
The module’s startup procedure involves a SIM card initialisation performed within 1 second
after getting started. An important issue is whether the initialisation procedure ends up with a
high or low level of the CCIN signal:
a)
If, during startup of MC55/56, the CCIN signal on the SIM interface is high, then the
status of the SIM card holder can be recognized each time the card is inserted or
ejected.
A low level of CCIN indicates that no SIM card tray is inserted into the holder. In this
case, the module keeps searching, at regular intervals, for the SIM card. Once the SIM
card tray with a SIM card is inserted, CCIN is taken high again.
b)
If, during startup of MC55/56, the CCIN signal is low, the module will also attempt to
initialise the SIM card. In this case, the initialisation will only be successful when the
card is present.
If the SIM card initialisation has been done, but the card is no more operational or
removed, then the module will never search again for a SIM card and only emergency
calls can be made.
Removing and inserting the SIM card during operation requires the software to be
reinitialised. Therefore, after reinserting the SIM card it is necessary to restart MC55/56.
It is strongly recommended to connect the contacts of the SIM card detect switch to the
CCIN input and to the CCVCC output of the module as illustrated in the sample diagram in
Figure 20.
Note: No guarantee can be given, nor any liability accepted, if loss of data is encountered
after removing the SIM card during operation.
Also, no guarantee can be given for properly initialising any SIM card that the user
inserts after having removed a SIM card during operation. In this case, the application
must restart MC55/56.
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Design considerations for SIM card holder
The schematic below is a sample configuration that illustrates the Molex SIM card holder
located on the DSB45 Support Box (evaluation kit used for type approval of the Siemens
MC55/56 reference setup, see [5]). X503 is the designation used for the SIM card holder in
[5].
Molex card holder
GSM module
Figure 20: SIM card holder of DSB45 Support Box
Table 16: Pin assignment of Molex SIM card holder on DSB45 Support Box
Pin no. Signal name
I/O
Function
CCVCC
Supply voltage for SIM card, generated by the GSM engine
CCRST
Chip card reset, prompted by the GSM engine
CCCLK
Chip card clock
CCGND
Individual ground line for the SIM card to improve EMC
CCVPP
Not connected
CCIO
I/O
Serial data line, bi-directional
CCDET1
Connect to CCVCC
CCDET2
Connects to the CCIN input of the GSM engine. Serves to
recognize whether a SIM card is in the holder.
Pins 1 through 8 (except for 5) are the minimum
requirement according to the GSM Recommendations,
where pins 7 and 8 are needed for SIM card tray
detection through the CCIN pin.
Figure 21: Pin numbers of Molex SIM card holder on DSB45
Support Box
Place the capacitors C1205 and C1206 (or instead one capacitor of 200nF) as close as
possible to the pins 1 (CCVCC) and 4 (GND) of the card holder. Connect the capacitors to
the pins via low resistance tracks.
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3.12 Control signals
3.12.1
Inputs
Table 17: Input control signals of the MC55/56 module
Signal
Pin
Pin status
Function
Remarks
Ignition
/IGT
Falling edge
Power up MC55/56
Left open or HiZ
No operation
Active low ³ 100ms (Open
drain/collector driver to GND
required in cellular device
application).
Note: If a charger and a
battery is connected to the
customer application the /IGT
signal must be 1s minimum.
Emergency
shutdown
/EMERGOFF
Low
Power
MC55/56
Left open or HiZ
No operation
down Active low ³ 3.2s (Open
drain/collector driver required
in cellular device application).
At the /EMERGOFF signal the
watchdog signal of the GSM
engine can be traced (see
description in Table 27).
(HiZ = high impedance)
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3.12.2
Outputs
3.12.2.1
Synchronization signal
mo b i l e
The synchronization signal serves to indicate growing power consumption during the
transmit burst. The signal is generated by the SYNC pin (pin number 32). Please note that
this pin can adopt two different operating modes which you can select by using the
AT^SSYNC command (mode 0 and 1). For details refer to the following chapter and to [1].
To generate the synchronization signal the pin needs to be configured to mode 0 (= default).
This setting is recommended if you want your application to use the synchronization signal
for better power supply control. Your platform design must be such that the incoming signal
accommodates sufficient power supply to the MC55/56 module if required. This can be
achieved by lowering the current drawn from other components installed in your application.
The characteristics of the synchronization signal are explained below.
Table 18: MC55/56 synchronization signal (if SYNC pin is set to mode 0 via AT^SSYNC)
Function
Pin
Pin status
Description
Synchronization
SYNC
Low
No operation
High
Indicates increased power consumption
during transmission.
1 Tx 577 µs every 4.616 ms
2 Tx 1154 µs every 4.616 ms
Transmit burst
SYNC signal
*)
300 µs
Figure 22: SYNC signal during transmit burst
*)
The duration of the SYNC signal is always equal, no matter whether the traffic or the
access burst are active.
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3.12.2.2
mo b i l e
Using the SYNC pin to control a status LED
As an alternative to generating the synchronization signal, the SYNC pin can be used to
control a status LED on your application platform.
To avail of this feature you need to set the SYNC pin to mode 1 by using the AT^SSYNC
command. For details see [1].
When controlled from the SYNC pin the LED can display the functions listed in Table 19.
Table 19: Coding of the status LED
LED mode
Operating status
Off
MC55/56 is off or run in SLEEP, Alarm or Charge-only mode
600 ms On / 600ms Off
No SIM card inserted or no PIN entered, or network search in
progress, or ongoing user authentication, or network login in
progress.
75 ms On / 3 s Off
Logged to network (monitoring control channels and user
interactions). No call in progress.
75 ms on / 75 ms Off / 75 ms On / One or more GPRS contexts activated.
3 s Off
Flashing
Indicates GPRS data transfer: When a GPRS transfer is in
progress, the LED goes on within 1 second after data packets
were exchanged. Flash duration is approximately 0.5 s.
On
Depending on type of call:
Voice call: Connected to remote party.
Data call: Connected to remote party or exchange of
parameters while setting up or disconnecting a call.
LED Off = SYNC pin low. LED On = SYNC pin high (if LED is connected as illustrated in Figure 23)
To operate the LED a buffer, e.g. a transistor or gate,
must be included in your application. A sample
configuration can be gathered from Figure 23. Power
consumption in the LED mode is the same as for the
synchronization signal mode. For details see Table
27, SYNC pin.
Figure 23: LED Circuit (Example)
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3.12.2.3
mo b i l e
Behaviour of the /RING0 line (ASC0 interface only)
The /RING0 line is available on the first interface (ASC0). Its behaviour depends on the type
of the call received.
· When a voice call comes in the /RING0 line goes low for 1s and high for another 4s.
Every 5 seconds the ring string is generated and sent over the /RXD0 line.
If there is a call in progress and call waiting is activated for a connected handset or
handsfree device, the /RING0 line switches to ground in order to generate acoustic
signals that indicate the waiting call.
4s
4s
/RING0
1s
Ring
string
1s
Ring
string
1s
Ring
string
Figure 24: Incoming voice call
·
Likewise, when a Fax or data call is received, /RING0 goes low. However, in contrast to
voice calls, the line remains low. Every 5 seconds the ring string is generated and sent
over the /RXD0 line.
5s
5s
/RING0
Ring
string
Ring
string
Ring
string
Figure 25: Incoming data call
·
All types of Unsolicited Result Codes (URCs) also cause the
/RING0 line to go low, however for 1 second only.
For example, MC55/56 may be configured to output a URC
upon the receipt of an SMS. As a result, if this URC type
was activated with AT+CNMI=1,1, each incoming SMS
causes the /RING0 line to go low. See [1] for detailed
information on URCs.
/RING0
1s
URC
Figure 26: URC transmission
Table 20: MC55/56 ring signal
Function
Pin
Status
Description
Ring indication
/RING0
Indicates an incoming call or URC. If in NON-CYCLIC
SLEEP mode CFUN=0 or CYCLIC SLEEP mode
CFUN=5 or 6, the module is caused to wake up to full
functionality. If CFUN=7 or 8, power saving is resumed
after URC transmission or end of call.
No operation
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4 Antenna interface
The RF interface has an impedance of 50Ω. MC55/56 is capable of sustaining a total
mismatch at the antenna connector or pad without any damage, even when transmitting at
maximum RF power.
The external antenna must be matched properly to achieve best performance regarding
radiated power, DC-power consumption and harmonic suppression. Matching networks are
not included on the MC55/56 PCB and should be placed in the host application.
Regarding the return loss MC55/56 provides the following values:
Table 21: Return loss
State of module
Return loss of module
Recommended return loss of application
Receive
> 8dB
> 12dB
Transmit
not applicable
> 12dB
Idle
< 5dB
not applicable
The connection of the antenna or other equipment must be decoupled from DC voltage.
4.1
Antenna installation
To suit the physical design of individual applications MC55/56 offers two alternative
approaches to connecting the antenna:
· Recommended approach: U.FL-R-SMT antenna connector from Hirose assembled on
the component side of the PCB (top view on MC55/56). See Chapter 4.1.2 for details.
· Antenna pad and grounding plane placed on the bottom side. See Chapter 4.1.1.
Figure 27: U.FL-R-SMT connector
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Figure 28: Antenna pad and GND plane
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The U.FL-R-SMT connector has been chosen as antenna reference point (ARP) for the
Siemens reference equipment submitted to type approve MC55/56. All RF data specified
throughout this manual are related to the ARP. For compliance with the test results of the
Siemens type approval you are advised to give priority to the connector, rather than using
the antenna pad.
IMPORTANT: Both solutions can only be applied alternatively. This means, whenever an
antenna is plugged to the Hirose connector, the pad must not be used. Vice versa, if the
antenna is connected to the pad, then the Hirose connector must be left empty.
Antenna connected to Hirose connector:
Module
PAD
U.FL
Antenna connected to pad:
Antenna or
measurement
equipment
PAD
U.FL
50Ohm
50Ohm
50Ohm
Module
Antenna or
measurement
equipment
50Ohm
Figure 29: Never use antenna connector and antenna pad at the same time
No matter which option you choose, ensure that the antenna pad does not come into contact
with the holding device or any other components of the host application. It needs to be
surrounded by a restricted area filled with air, which must also be reserved 0.8 mm in height.
U.FL antenna connector
RF section
PCB
Antenna pad
Restricted area
Figure 30: Restricted area around antenna pad
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4.1.1 Antenna pad
The antenna can be soldered to the pad, or attached via contact springs. To help you ground
the antenna, MC55/56 comes with a grounding plane located close to the antenna pad. The
positions of both pads can be seen from Figure 41.
When you decide to use the antenna pad take into account that the pad has not been
intended as antenna reference point (ARP) for the Siemens MC55/56 type approval. The
antenna pad is provided only as an alternative option which can be used, for example, if the
recommended Hirose connection does not fit into your antenna design.
Also, consider that according to the GSM recommendations TS 45.005 and TS 51.010-01 a
50Ω connector is mandatory for type approval measurements. This requires GSM devices
with an integral antenna to be temporarily equipped with a suitable connector or a low loss
RF cable with adapter.
To prevent damage to the module and to obtain long-term solder joint properties you are
advised to maintain the standards of good engineering practice for soldering.
MC55/56 material properties:
MC55/56 PCB:
FR4
Antenna pad:
Gold plated pad
4.1.1.1 Suitable cable types
For direct solder attachment, we suggest to use the following cable types:
· RG316/U 50 Ohm coaxial cable
· 1671A 50 Ohm coaxial cable
Suitable cables are offered, for example, by IMS Connector Systems. For further details and
other cable types please contact http://www.imscs.com.
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4.1.2 Hirose antenna connector
MC55/56 uses an ultra-miniature SMT antenna connector
supplied from Hirose Ltd. The product name is:
U.FL-R-SMT
The position of the antenna connector on the MC55/56 board can
be seen in Figure 40.
Figure 31: Mechanical dimensions of U.FL-R-SMT connector
Table 22: Product specifications of U.FL-R-SMT connector
Item
Specification
Conditions
Nominal impedance
50 W
Rated frequency
DC to 3 GHz
Operating temp:-40°c to + 90°C
Operating humidity: max. 90%
Ratings
Mechanical characteristics
Female contact holding
force
0.15 N min
Measured with a Æ 0.475 pin
gauge
Repetitive operation
Contact resistance:
Centre 25 mW
Outside 15mW
30 cycles of insertion and
disengagement
Vibration
No momentary disconnections of
1 µs;
No damage, cracks and looseness
of parts
Frequency of 10 to 100 Hz, single
amplitude of 1.5 mm,
acceleration of 59 m/s2, for 5
cycles in the direction of each of
the 3 axes
Shock
No momentary disconnections of
Acceleration of 735 m/s2, 11 ms
1 µs.
duration for 6 cycles in the
No damage, cracks and looseness direction of each of the 3 axes
of parts.
Environmental characteristics
Humidity resistance
No damage, cracks and looseness Exposure to 40°C, humidity of
of parts.
95% for a total of 96 hours
Insulation resistance:
100 MW min. at high humidity
500 MW min when dry
Temperature cycle
No damage, cracks and looseness
of parts.
Contact resistance:
Centre 25 mW
Outside 15mW
Temperature: +40°C ® 5 to 35°C
® +90°C ® 5 to 35°C
Time: 30 min. ® within 5 min. ®
30 min. within 5 min
Salt spray test
No excessive corrosion
48 hours continuous exposure to
5% salt water
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Table 23: Material and finish of U.FL-R-SMT connector and recommended plugs
Part
Material
Finish
Shell
Phosphor bronze
Silver plating
Male centre contact
Brass
Gold plating
Female centre contact
Phosphor bronze
Gold plating
Insulator
Plug:
Receptacle:
PBT
LCP
Black
Beige
Mating plugs and cables can be chosen from the Hirose U.FL Series. Examples are shown
below and listed in Table 24. For latest product information please contact your Hirose
dealer or visit the Hirose home page, for example http://www.hirose.com.
Figure 32: U.FL-R-SMT connector with U.FL-LP-040 plug
Figure 33: U.FL-R-SMT connector with U.FL-LP-066 plug
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In addition to the connectors illustrated above, the U.FL-LP-(V)-040(01) version is offered as
an extremely space saving solution. This plug is intended for use with extra fine cable (up to
Æ 0.81 mm) and minimizes the mating height to 2 mm. See Figure 34 which shows the
Hirose datasheet.
Figure 34: Specifications of U.FL-LP-(V)-040(01) plug
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Table 24: Ordering information for Hirose U.FL Series
Item
Part number
HRS number
Connector on MC55/56
U.FL-R-SMT
CL331-0471-0-10
Right-angle plug shell for
Æ 0.81 mm cable
U.FL-LP-040
CL331-0451-2
Right-angle plug for
Æ 0.81 mm cable
U.FL-LP(V)-040 (01)
CL331-053-8-01
Right-angle plug for
Æ 1.13 mm cable
U.FL-LP-066
CL331-0452-5
Right-angle plug for
Æ 1.32 mm cable
U.FL-LP-066
CL331-0452-5
Extraction jig
E.FL-LP-N
CL331-04441-9
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5 Electrical, reliability and radio characteristics
5.1
Absolute maximum ratings
Absolute maximum ratings for supply voltage and voltages on digital and analog pins of
MC55/56 are listed in Table 25. Exceeding these values will cause permanent damage to
MC55/56.
The power supply shall be compliant with the SELV safety standard defined in EN60950.
The supply current must be limited according to Table 25.
Table 25: Absolute maximum ratings
Parameter
Min
Max
Unit
Voltage BATT+
-0.3
4.8
Voltage at digital pins
-0.3
3.3
Voltage at analog pins
-0.3
3.0
Voltage at digital / analog pins in POWER DOWN mode
-0.25
+0.25
Voltage at POWER pin
15
Voltage at CHARGE pin
15
Differential load resistance between EPNx and EPPx
5.2
15
Operating temperatures
Test conditions were specified in accordance with IEC 60068-2 (still air). The values stated
below are in compliance with GSM recommendation TS 51.010-01.
Table 26: Operating temperatures
Parameter
Ambient temperature (according to GSM 11.10)
Restricted operation
*)
Min
Typ
Max
Unit
-20
25
55
°C
-25 to -20
55 to 65
°C
-29
-18
>65
>60
°C
°C
+45
°C
Automatic shutdown
MC55/56 board temperature
Battery temperature
Charging temperature (software controlled fast charging)
**)
*)
MC55/56 works, but deviations from the GSM specification may occur.
**)
The MC55/56 has the automatic shutdown set to 65°C at power class 5 (GSM900/GSM850)
GPRS class 8. This prevents permanent damage to components on the board. Consider the
ratio of output power, supply voltage and operating temperature: To achieve Tamb max = 65°C and,
for example, GSM 900 PCL5 the supply voltage must not be higher than 4.0V.
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5.3
mo b i l e
Electrical specifications of the application interface
Please note that the reference voltages listed in Table 27 are the values measured directly
on the MC55/56 module. They do not apply to the accessories connected.
If an input pin is specified for Vi,h,max = 3.3V, be sure never to exceed the stated voltage. The
value 3.3V is an absolute maximum rating.
The Hirose DF12C board-to-board connector on MC55/56 is a 50-pin double-row receptacle.
The names and the positions of the pins can be seen from Figure 35 which shows the top
view of MC55.
26
50
BATT+
GND
BATT+
GND
BATT+
GND
BATT+
GND
BATT+
GND
VDD
CHARGE
/RING0
POWER
/DSR0
VDDLP
/RTS0
/TXD0
/DTR0
/TXD1
/RTS1
/RXD0
/CTS0
/RXD1
/CTS1
SYNC
/DCD0
BATT_TEMP
/EMERGOFF
RFSDAI
/IGT
TXDDAI
GND
SCLK
MICN1
TFSDAI
MICP1
RXDDAI
MICP2
CCGND
MICN2
CCIN
EPN1
CCRST
EPP1
CCIO
EPP2
CCVCC
EPN2
CCCLK
25
Figure 35: Pin assignment (top view on MC55)
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Table 27: Electrical description of application interface
Function
Signal name
IO
Signal form and level
Comments
Power
supply
BATT+
VI = 3.3V to 4.8V
VInorm = 4.1V
Inorm ≈ 2A, Imax < 3A (during Tx burst)
1 Tx, peak current 577µs every 4.616ms
2 Tx, peak current 1154µs every 4.616ms
Power supply input.
5 BATT+ pins to be
connected in parallel.
5 GND pins to be
connected in parallel.
The power supply must be
able to meet the
requirements of current
consumption in a Tx burst
(up to 3A).
Sending with two timeslots
doubles the duration of
current pulses to 1154µs
(every 4.616ms)!
VImin = 3.0V
VImax = 15V
This line signalises to the
processor that the charger
is connected.
If unused keep pin open.
GND
Charge
interface
POWER
BATT_TEMP
CHARGE
ICHARGE = -300µA ... -600µA
@ 3V < VCHARGE < VLOAD
This line is a current
source for the charge FET
with a 10kW resistance
between gate and source.
If unused keep pin open.
External
supply
voltage
VDD
VDDmin = 2.84V, VDDmax = 2.96V
Imax = -10mA
CLmax = 1µF
Supply voltage, e.g. for an
external LED or level
shifter. The external digital
logic must not cause any
spikes or glitches on
voltage VDD.
Not available in POWER
DOWN mode.
VDD signalises the “ON”
state of the module.
If unused VDD keep pin
open.
VDD Low
Power
VDDLP
I/O
RI =1kW
VOmax ≈ 4.0V (output)
Supplies the RTC with
power via an external
capacitor or buffer battery
if no VBATT+ is applied.
If unused keep pin open.
Connect NTC with RNTC ≈ 10kW @ 25°C
to ground.
VImin = 2.2V, VImax = 5.5V (input)
IItyp = 10µA at BATT+ = 0V
Mobile in POWER DOWN mode:
VImin = 1.2V
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Input to measure the
battery temperature over
NTC resistor.
NTC should be installed
inside or near battery pack
to enable the charging
algorithm and deliver
temperature values.
If unused keep pin open.
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Function
Signal name
IO
Signal form and level
Comments
Ignition
/IGT
RI ≈ 100kW, CI ≈ 1nF
VILmax = 0.5V at Imax = -20µA
VOpenmax = 2.3V
Input to switch the mobile
ON.
The line must be driven
low by an Open Drain or
Open Collector driver.
ON
Emergency
shutdown
(Watchdog)
/EMERGOFF
~~~
|____|
~~~
Active Low ³ 100ms
RI ≈22kW
VILmax = 0.5V at Imax = -100µA
VOpenmax = 2.73V
~~~
|______|
Signal
~~~
Active Low ³ 3.2s
Watchdog:
VOLmax = 0.35V at I = 10µA
VOHmin= 2.25V at I = -10µA
fOmin = 0.16Hz
fOmax = 1.55Hz
Synchronization
SYNC
VOLmax = 0.2V at I = 1mA
VOHmin = 2.35V at I = -1mA
VOHmax = 2.73V
1 Tx, 877µs impulse each 4.616ms and
2 Tx, 1454µs impulse each 4.616ms, with
300µs forward time.
SIM interface CCIN
This line must be driven by
an Open Drain or Open
Collector driver.
Emergency shutdown
deactivates the power
supply to the module.
The module can be reset if
/IGT is activated after
emergency shutdown.
To switch the mobile off
use the AT^SMSO
command.
/EMERGOFF also
indicates the internal
watchdog function.
If unused keep pin open.
Indicates increased current
consumption during uplink
transmission burst. Note
that timing is different
during handover.
Alternatively used to
control status LED (see
Chapter 3.12.2.2).
If unused keep pin open.
RI ≈ 100kW
VILmax = 0.5V
VIHmin = 2.15V at I = 20µA,
VIHmax=3.3V at I = 30µA
CCIN = high, SIM card
holder closed (no card
recognition)
CCRST
RO ≈47W
VOLmax = 0.25V at I = 1mA
VOHmin = 2.3V at I = -1mA
VOHmax = 2.73V
CCIO
IO
RI ≈10kW
VILmax = 0.5V
VIHmin = 1.95V, VIHmax=3.3V
Maximum cable length
200mm to SIM card holder.
All signals of SIM interface
are protected against ESD
with a special diode array.
Usage of CCGND is
mandatory.
RO ≈220W
VOLmax = 0.4V at I = 1mA
VOHmin = 2.15V at I = -1mA
VOHmin = 2.55V at I = -20µA
VOHmax = 2.96V
CCCLK
RO ≈220W
VOLmax = 0.4V at I = 1mA
VOHmin = 2.15V at I = -1mA
VOHmax = 2.73V
CCVCC
ROmax = 5W
CCVCCmin = 2.84V,
CCVCCmax = 2.96V
Imax = -20mA
CCGND
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Function
Signal name
IO
Signal form and level
Comments
ASC0
interface
/RXD0
/TXD0
First serial interface for AT
commands or data stream.
/CTS0
VOLmax = 0.2V at I = 1mA
VOHmin = 2.35V at I = -1mA
VOHmax = 2.73V
/RTS0
ASC1
interface
Digital audio
interface
/DTR0
/DCD0
/DSR0
/RING0
/RXD1
/TXD1
/CTS1
/RTS1
RFSDAI
RXDDAI
SCLK
TFSDAI
TXDDAI
EPP1
EPN1
MICP1
MICN1
MICP2
MICN2
Explanation of signal names:
P = positive, N = negative
Analog audio EPP2
interfaces
EPN2
VILmax = 0.5V
VIHmin = 1.95V, VIHmax=3.3V
/DTR0, RTS0: Imax = -90µA at VIN = 0V
/TXD0: Imax = -30µA at VIN = 0V
VOLmax = 0.2V at I = 1mA
VOHmin = 2.35V at I = -1mA
VOHmax = 2.73V
Second serial interface for
AT commands.
If unused keep pins open.
VILmax = 0.5V
VIHmin = 1.95V, VIHmax=3.3V
IImax = -90µA at VIN = 0V
VOLmax = 0.2V at I = 1mA
VOHmin = 2.35V at I = -1mA
VOHmax = 2.73V
If unused keep pins open.
VILmax = 0.5V
VIHmin = 1.95V, VIHmax=3.3V
IImax = 330µA at VIN = 3.3V
VOmax = 3.7Vpp
See also Table 31.
The audio output is
balanced and can directly
operate an earpiece.
If unused keep pins open.
VOmax = 3.7Vpp
See also Table 31.
Balanced audio output.
Can be used to directly
operate an earpiece.
If unused keep pins open.
RI ≈ 50kW differential
VImax = 1.03Vpp
See also Table 32.
Balanced microphone
input. To be decoupled
with 2 capacitors (CK =
100nF), if connected to a
microphone or another
device.
If unused keep pins open.
RI = 2kW differential
VImax = 1.03Vpp
See also Table 32.
Balanced microphone
input. Can be used to
directly feed an active
microphone.
If used for another signal
source, e.g. op amp, to be
decoupled with capacitors.
If unused keep pins open.
AGND
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If unused keep pins open.
Separate ground
connection for external
audio circuits.
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5.4
mo b i l e
Power supply ratings
Table 28: Power supply ratings
Parameter Description
Conditions
BATT+
Reference points on MC55/56:
TP BATT+ and TP GND (see
Figure 41).
Supply voltage
Min
3.3
Typ
Max
4.1
Unit
4.8
400
mV
Voltage must stay within the
min/max values, including voltage
drop, ripple, spikes.
Voltage drop during
transmit burst
Normal condition, power control
level for Pout max
Voltage ripple
Normal condition, power control
level for Pout max
mV
@ f<200kHz
50
@ f>200kHz
IBATT+
Average supply
3)
current
POWER DOWN mode
50
SLEEP mode
@ DRX = 6
IDLE mode
TALK mode
mA
GSM850
15
mA
EGSM 900
15
GSM 1800/1900
15
GSM850
1)
260
EGSM 900
GSM 1800/1900
15
EGSM 900
15
GSM 1800/1900
15
DATA mode GPRS,
1)
(4 Rx, 1 Tx)
E GSM850
300
1)
GSM 900
GSM 1800/1900
DATA mode GPRS,
1)
(3 Rx, 2 Tx)
GSM850
1)
GSM 1800/1900
Power control level PCL 0
3)
All average supply current values @ IVDD = 0mA
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mA
450
2)
Power control level PCL 5
mA
230
450
EGSM 900
Peak supply current Power control level
(during transmission
slot every 4.6ms)
mA
300
2)
2)
180
GSM850
1)
mA
260
2)
1)
µA
1)
IDLE GPRS
100
330
1.6
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5.4.1 Current consumption during transmit burst
The diagrams provided in Figure 36 and Figure 37 illustrate the typical current consumption
of the application caused during a transmit burst. The typical peak current is shown vs. the
power control level for 900 MHz, 1800 MHz and 1900 MHz and vs. the return loss of the
antenna.
Test conditions: All measurements have been performed at Tamb= 25°C, VBATT+ nom = 4.1V.
The voltage in the transmit burst was measured with the AT^STBD=1 command, however it
could just as easily be measured by using the BATT+ and GND test points on the back side
of the module. The curves are for one TX slot (for example a voice call, CSD call or Class 8
GPRS). Curves for Class 10 GPRS activities (2 TX slots) are shown too.
Changing the conditions, e.g. in terms of temperature or voltage, will cause different results.
The current will be maximized when the maximum supply voltage is used together with a
total reflection at the RF interface.
Average Current GSM900 (VBATT+=4.1V)
0.5
0.45
0.4 0.43
1 TX - Average Current
2 TX - Average Current
Current (Amps)
0.35
0.33
0.3
0.25
0.25
0.23
0.2
0.21
0.15
0.16
0.15
0.1
0.11
0.14
0.13
0.10
0.10
0.05
11
13
15
17
Power Control Level
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Average Current DCS1800 (VBATT+=4.1V)
0.3
0.25
0.26
1 TX - Average Current
2 TX - Average Current
Current (Amps)
0.2
0.19
0.15
0.18
0.16
0.14
0.13
0.13
0.1
0.12
0.10
0.10
0.05
10
11
12
13
14
15
Power Control Level
Average Current PCS1900 (VBATT+=4.1V)
0.3
0.29
0.25
1 TX - Average Current
2 TX - Average Current
Current (Amps)
0.2
0.15
0.21
0.17
0.17
0.14
0.13
0.13
0.12
0.1
0.11
0.10
0.05
10
11
12
13
14
Power Control Level
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Burst Current GSM900 (VBATT+=4.1V)
1.8
1.6
1.6
1.4
1 TX - Peak current
1.2
Current (Amps)
1.24
0.8
0.6
0.68
0.4
0.4
0.3
0.2
0.28
11
13
15
17
19
Power Control Level
Burst Current DCS1800 (VBATT+=4.1V)
0.9
0.8
1 TX - Peak current
0.84
Current (Amps)
0.7
0.6
0.5
0.52
0.4
0.38
0.3
0.27
0.2
0.24
0.1
10
11
12
13
14
Power Control Level
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Burst Current PCS1900 (VBATT+=4.1V)
0.92
0.9
0.8
1 TX - Peak current
Current (Amps)
0.7
0.6
0.6
0.5
0.4
0.42
0.3
0.3
0.24
0.2
0.1
10
11
12
13
14
Power Control Level
Test conditions: Tamb= 25°C, VBATT+ nom = 4.1V
Figure 36: Typical current consumption vs. power control level
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1600
Service mode GSM900 ch.124
Variations in current with 0.4dB return
loss (all phases)
1400
1200
Current (mA)
1000
ch.124 PCL5
800
600
400
200
Burst (max)
Burst (min)
Average Current (Max)
Average Current (Min)
1000
Service mode PCS1900 ch.661
Variations in current with 0.6dB return
loss (all phases)
900
800
700
Current (mA)
600
ch.661 PCL0
500
400
300
200
100
Burst (max)
Burst (min)
Average Current (Max)
Average Current (Min)
Test conditions: Tamb= 25°C, VBATT+ nom = 4.1V measured at TP BATT+ and GND, 1 TX slot
Figure 37: Typical current consumption vs. return loss
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Electrical characteristics of the voiceband part
5.4.2 Setting audio parameters by AT commands
The audio modes 2 to 6 can be adjusted according to the parameters listed below. Each
audio mode is assigned a separate set of parameters.
Table 29: Audio parameters adjustable by AT command
Parameter
Influence to
Range
Gain range
Calculation
inBbcGain
MICP/MICN analog amplifier gain of
baseband controller before ADC
0...7
0...42dB
6dB steps
inCalibrate
digital attenuation of input signal
after ADC
0...32767 -∞...0dB
20 * log
(inCalibrate/
32768)
outBbcGain
EPP/EPN analog output gain of
baseband controller after DAC
0...3
6dB steps
outCalibrate[n]
n = 0...4
digital attenuation of output signal
after speech decoder, before
summation of sidetone and DAC
0...32767 -∞...+6dB
20 * log (2 *
outCalibrate[n]/
32768)
0...32767 -∞...0dB
20 * log
(sideTone/
32768)
0...-18dB
present for each volume step[n]
sideTone
digital attenuation of sidetone
is corrected internally by outBbcGain
to obtain a constant sidetone
independent of output volume
Note: The parameters inCalibrate, outCalibrate and sideTone accept also values from 32768
to 65535. These values are internally truncated to 32767.
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5.4.3 Audio programming model
The audio programming model shows how the signal path can be influenced by varying the
AT command parameters. The model is the same for all three interfaces, except for the
parameters  and  which cannot be modified if the digital audio
interface is being used, since in this case the DAC is switched off.
The parameters inBbcGain and inCalibrate can be set with AT^SNFI. All the other
parameters are adjusted with AT^SNFO.
2,65V
1k
MIC2
inCalibrate
1k
-¥...0dB
10uF
1k
1k
inBbcGain
Speech coder
+0...42dB in 6dB steps
sideTone
outBbcGain
0dB; -6db, -12dB; -18dB
Speech decoder
outCalibrate[n]
n = 0...4
AT parameters
Figure 38: AT audio programming model
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5.4.4 Characteristics of audio modes
The electrical characteristics of the voiceband part depend on the current audio mode set
with the AT^SNFS command.
Table 30: Voiceband characteristics (typical)
Audio mode no.
AT^SNFS=
1 (Default
settings, not
adjustable)
Name
Default
Handset
Basic
Handsfree
Headset
User
Handset
Plain
Codec 1
Plain
Codec 2
Purpose
DSB with
Votronic
handset
Siemens Car
Kit Portable
Siemens
Headset
DSB with
individual
handset
Direct
access to
speech
coder
Direct
access to
speech
coder
Gain setting via AT
command. Defaults:
inBbcGain
outBbcGain
Fix
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
4 (24dB)
1 (-6dB)
2 (12dB)
1 (-6dB)
5 (30dB)
2 (-12dB)
4 (24dB)
1 (-6dB)
0 (0dB)
0 (0dB)
0 (0dB)
0 (0dB)
Default audio
interface
Power supply
ON (2.65V)
ON (2.65V)
ON (2.65V)
ON (2.65V) OFF (GND) OFF (GND)
Sidetone
ON
---
Adjustable
Adjustable
Adjustable
Adjustable
Volume control
OFF
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Limiter (receive)
ON
ON
ON
ON
---
---
---
---
---
---
ON
---
---
---
1)
4)
Compressor
(receive)
---
OFF
AGC (send)
---
---
Echo control (send)
Suppression Cancellation + --suppression
Suppression
---
---
Noise suppression
---
up to 10dB
10dB
---
---
---
MIC input signal for
0dBm0 @ 1024 Hz
(default gain)
23mV
58mV
7.5mV @
23mV
-3dBm0 due
to AGC
315mV
315mV
EP output signal in
mV rms. @ 0dBm0,
1024 Hz, no load
(default gain);
@ 3.14 dBm0
284mV
120mV
default @
max volume
300mV
284mV
default @
default @
max volume max
volume
895mV
895mV
3.7Vpp
3.7Vpp
Sidetone gain at
default settings
22.8dB
-2.5dB
sideTone
3)
= 8192
-2.5dB
sideTone
3)
= 8192
2)
1)
2)
3)
4)
-∞ dB
Affected by
AGC, 13dB
@ 7.5mV
(MIC)
22.8dB
Adaptive, receive volume increases with higher ambient noise level. The compressor can be
activated by loading an application specific audio parameter set (see [8]).
In audio modes with noise reduction, the microphone input signal for 0dBm0 shall be measured
with a sine burst signal for a tone duration of 5 seconds and a pause of 2 sec. The sine signal
appears as noise and, after approx. 12 sec, is attenuated by the noise reduction by up to 10dB.
See AT^SNFO command in [1].
Audio mode 5 and 6 are identical. With AT^SAIC, you can easily switch mode 5 to the second
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interface. Therefore, audio mode 6 is only kept for compatibility to earlier Siemens GSM products.
Note: With regard to acoustic shock, the cellular application must be designed to avoid
sending false AT commands that might increase amplification, e.g. for a high
sensitive earpiece. A protection circuit should be implemented in the cellular
application.
5.4.5 Voiceband receive path
Test conditions:
· The values specified below were tested to 1kHz and 0dB gain stage, unless otherwise
stated.
· Parameter setup: gs = 0dB means audio mode = 5 for EPP1 to EPN1 and 6 for EPP2 to
EPN2, inBbcGain= 0, inCalibrate = 32767, outBbcGain = 0, OutCalibrate = 16384,
sideTone = 0.
Table 31: Voiceband receive path
Parameter
Min
Typ
Max
Unit
Test condition / remark
Differential output
voltage (peak to peak)
3.33
3.7
4.07
from EPPx to EPNx
gs = 0dB @ 3.14 dBm0
no load
Differential output gain
settings (gs) at 6dB
stages (outBbcGain)
-18
dB
Set with AT^SNFO
Fine scaling by DSP
(outCalibrate)
-∞
dB
Set with AT^SNFO
100
mV
gs = 0dB, outBbcGain = 0 and -6dB
Ω
from EPPx to EPNx
Output differential
DC offset
Differential output
resistance
Differential load
capacitance
1000
pF
from EPPx to EPNx
Absolute gain accuracy
0.8
dB
Variation due to change in
temperature and life time
Attenuation distortion
dB
for 300...3900Hz,
@ EPPx/EPNx (333Hz) /
@ EPPx/EPNx (3.66kHz)
Out-of-band
discrimination
60
dB
for f > 4kHz with in-band test
signal@ 1kHz and 1kHz RBW
gs = gain setting
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5.4.6 Voiceband transmit path
Test conditions:
· The values specified below were tested to 1kHz and 0dB gain stage, unless otherwise
stated.
· Parameter setup: Audio mode = 5 for MICP1 to MICN1 and 6 for MICP2 to MICN2,
inBbcGain= 0, inCalibrate = 32767, outBbcGain = 0, OutCalibrate = 16384, sideTone = 0
Table 32: Voiceband transmit path
Parameter
Min
Typ
Input voltage (peak to peak)
Max
Unit
1.03
Test condition/Remark
MICP1 to MICN1, MICP2 to
MICN2
Input amplifier gain in 6dB steps
(inBbcGain)
42
dB
Set with AT^SNFI
Fine scaling by DSP (inCalibrate)
-∞
dB
Set with AT^SNFI
Input impedance MIC1
50
kΩ
Input impedance MIC2
2.0
kΩ
Microphone supply voltage ON
Ri = 4kΩ (MIC2 only)
Microphone supply voltage OFF ;
Ri = 4kΩ (MIC2 only)
2.57
2.17
1.77
2.65
2.25
1.85
2.73
2.33
1.93
Microphone supply in POWER
DOWN mode
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no supply current
@ 100µA
@ 200µA
See Figure 17
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5.5
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Air interface
Test conditions: All measurements have been performed at Tamb= 25°C, VBATT+ nom = 4.1V.
The reference points used on MC55/56 are the BATT+ and GND contacts (test points are
shown in Figure 41).
Table 33: Air Interface
Parameter
Min
Typ
Max
Unit
Frequency range
GSM 850
824
849
MHz
Uplink (MS ® BTS)
E-GSM 900
880
915
MHz
GSM 1800
1710
1785
MHz
GSM 1900
1850
1910
MHz
Frequency range
GSM 850
869
894
MHz
Downlink (BTS ® MS)
E-GSM 900
925
960
MHz
GSM 1800
1805
1880
MHz
GSM 1900
1930
1990
MHz
GSM 850
31
33
35
dBm
31
33
35
dBm
GSM 1800
28
30
32
dBm
GSM 1900
28
30
32
dBm
RF power @ ARP with 50Ω load
E-GSM 9001)
2)
Number of carriers
Duplex spacing
GSM 850
124
E-GSM 900
174
GSM 1800
374
GSM 1900
299
GSM 850
45
MHz
E-GSM 900
45
MHz
GSM 1800
95
MHz
GSM 1900
80
MHz
200
kHz
Carrier spacing
Multiplex, Duplex
TDMA / FDMA, FDD
Time slots per TDMA frame
Frame duration
4.615
ms
Time slot duration
577
µs
Modulation
GMSK
Receiver input sensitivity @ ARP
GSM 850
-102
-107
dBm
BER Class II < 2.4%
E-GSM 900
-102
-107
dBm
GSM 1800
-102
-106
dBm
GSM 1900
-102
-105.5
dBm
1)
Power control level PCL 5
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Power control level PCL 0
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5.6
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Electrostatic discharge
The GSM engine is not protected against Electrostatic Discharge (ESD) in general.
Consequently, it is subject to ESD handling precautions that typically apply to ESD sensitive
components. Proper ESD handling and packaging procedures must be applied throughout
the processing, handling and operation of any application that incorporates a MC55/56
module.
Special ESD protection provided on MC55/56:
Antenna interface: one spark discharge line (spark gap)
SIM interface: clamp diodes for protection against overvoltage.
The remaining ports of MC55/56 are not accessible to the user of the final product (since
they are installed within the device) and therefore, are only protected according to the
“Human Body Model” requirements.
MC55/56 has been tested according to the EN 61000-4-2 standard. The measured values
can be gathered from the following table.
Table 34: Measured electrostatic values
Specification / Requirements
Contact discharge
Air discharge
ESD at SIM port
± 4kV
± 8kV
ESD at antenna port
± 4kV
± 8kV
ETSI EN 301 489-7
Human Body Model (Test conditions: 1.5 kW, 100 pF)
ESD at the module
Note:
± 1kV
Please note that the values may vary with the individual application design. For
example, it matters whether or not the application platform is grounded over
external devices like a computer or other equipment, such as the Siemens
reference application described in Chapter 7.
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Reliability characteristics
The test conditions stated below are an extract of the complete test specifications.
Table 35: Summary of reliability test conditions
Type of test
Conditions
Standard
Vibration
Frequency range: 10-20 Hz; acceleration: 3.1mm
amplitude
DIN IEC 68-2-6
Frequency range: 20-500 Hz; acceleration: 5g
Duration: 2h per axis = 10 cycles; 3 axes
Shock half-sinus
Acceleration: 500g
DIN IEC 68-2-27
Shock duration: 1msec
1 shock per axis
6 positions (± x, y and z)
Dry heat
Temperature: +70 ±2°C
Test duration: 16 h
EN 60068-2-2 Bb ETS
300019-2-7
Humidity in the test chamber: < 50%
Temperature
change (shock)
Low temperature: -40°C ±2°C
DIN IEC 68-2-14 Na
High temperature: +85°C ±2°C
Changeover time: < 30s (dual chamber system)
ETS 300019-2-7
Test duration: 1 h
Number of repetitions: 100
Damp heat cyclic
High temperature: +55°C ±2°C
DIN IEC 68-2-30 Db
Low temperature: +25°C ±2°C
Humidity: 93% ±3%
ETS 300019-2-5
Number of repetitions: 6
Test duration: 12h + 12h
Cold (constant
exposure)
Temperature: -40 ±2°C
DIN IEC 68-2-1
Test duration: 16 h
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6 Mechanics
The following chapters describe the mechanical dimensions of MC55/56 and give
recommendations for integrating MC55/56 into the host application.
6.1
Mechanical dimensions of MC55/56
Figure 39 shows the top view on MC55/56 and provides an overview of the mechanical
dimensions of the board. For further details see Figure 40.
Size:
Weight:
35±0.15 x 32.5±0.15 x 3.1±0.3 mm (including application connector)
35±0.15 x 32.5±0.15 x 2.8±0.2 mm (excluding application connector)
5.5g
Figure 39: MC55/56 – top view
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All dimensions in millimetres
Figure 40: Mechanical dimensions of MC55/56
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Antenna ground
BATT+
Ground
Antenna pad
Figure 41: MC55/56 bottom view
6.2
Mounting MC55/56 onto the application platform
There are many ways to properly install MC55/56 in the host device. An efficient approach is
to mount the MC55/56 PCB to a frame, plate, rack or chassis.
Fasteners can be M1.6 or M1.8 screws plus suitable washers, circuit board spacers, or
customized screws, clamps, or brackets. Screws must be inserted with the screw head on
the bottom of the MC55/56 PCB.
In addition, the board-to-board connection can also be utilized to achieve better support.
To avoid short circuits ensure that the bottom of the MC55/56 PCB do not come into contact
with the host device since there are a number of test points. Refer to Chapter 6.4 for an
overview on a variety of cooling elements.
Again: Particular attention should be paid to the test points. These are for manufacturing
purposes only and care must be taken to avoid contacting them when grounding and
attaching a heat sink to the unit. Figure 41 shows the positions of all test points.
To prevent mechanical damage, be careful not to force, bend or twist the module. Be sure it
is positioned flat against the host device.
All the information you need to install an antenna is summarized in Chapter 4.1. Note that
the antenna pad on the bottom of the MC55/56 PCB must not be influenced by any other
PCBs, components or by the housing of the host device. It needs to be surrounded by a
restricted space as described in Chapter 4.1.
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Board-to-board connector
This chapter provides specifications for the 50-pin board-to-board connector which serves as
physical interface to the host application. The receptacle assembled on the MC55/56 PCB is
type Hirose DF12C. Mating headers from Hirose are available in different stacking heights.
Figure 42: Hirose DF12C receptacle on MC55/56
Figure 43: Header Hirose DF12 series
Table 36: Ordering information DF12 series
Item
Part number
Stacking
height (mm)
HRS number
Receptacle on MC55/56
DF12C(3.0)-50DS-0.5V(81)
3-5
537-0694-9-81
Headers DF12 series
DF12E(3.0)-50DP-0.5V(81)
3.0
537-0834-6-**
DF12E(3.5)-50DP-0.5V(81)
3.5
537-0534-2-**
DF12E(4.0)-50DP-0.5V(81)
4.0
537-0559-3-**
DF12E(5.0)-50DP-0.5V(81)
5.0
537-0584-0-**
Notes: The headers listed above are without boss and metal fitting. Please contact Hirose for details on
other types of mating headers. Asterixed HRS numbers denote different types of packaging.
Table 37: Electrical and mechanical characteristics of the Hirose DF12C connector
Parameter
Specification (50 pin board-to-board connector)
Number of contacts
50
Quantity delivered
2000 connectors per tape & reel
Voltage
50V
Rated current
0.3A max per contact
Resistance
0.05 Ohm per contact
Dielectric withstanding voltage
500V RMS min
Operating temperature
-45°C...+125°C
Contact material
phosphor bronze (surface: gold plated)
Insulator material
PA , beige natural
Stacking height
3.0 mm ; 3.5 mm ; 4.0 mm ; 5.0 mm
Insertion force
21.8N
st
Withdrawal force 1
10N
th
Withdrawal force 50
10N
Maximum connection cycles
50
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6.3.1 Mechanical dimensions of the Hirose DF12 connector
Figure 44: Mechanical dimensions of Hirose DF12 connector
6.3.2 Adapter cabling
The board-to-board connection is primarily intended for direct contact between both
connectors. If this assembly solution does not fit into your application design ensure that the
used adapter cable meets the following requirements:
·
·
Maximum length: 200 mm
It is recommended that the total cable length between the board-to-board connector pins
on MC55/56 and the pins of the card holder does not exceed 200 mm in order to meet
the specifications of 3GPP TS 51.010-1 and to satisfy the requirements of EMC
compliance.
Type of cable: Flexible cable or flexible printed circuit board designed to mate with the
Hirose receptacle and headers specified above.
The equipment submitted for type approving the Siemens reference setup of MC55/56
includes a 160mm adapter cable. See Chapter 7.1.
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Heat sinks and thermally conductive tapes
Thermal management solutions vary largely according to the usage of the final product and
the design of the host device. Therefore, the focus of this chapter is on a brief overview of
standard heat sinks and thermally conductive tapes that have been tested with MC55/56.
6.4.1 Test conditions and results
Table 38 shows the results of extensive testing based on different combinations of heat
sinks and thermally conductive tapes.
All measurements were performed under the same test conditions:
· GPRS connection, Power control level 5, GSM Band: 900MHz
· GPRS Class 10 (3x downlink, 2x uplink), Coding Scheme CS-4
· VBATT+ nom = 4.2V
· Ambient temperature: 55°C
· The conductive tapes were attached either to entire bottom area of the module (in Table
38 referred to as “Full area”), or only to the ground pad near the power amplifier (in Table
38 referred to as “PA only”).
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Table 38: Tested heat sinks and thermally conductive tapes and test results
Manufacturer
Product name
Description
Rth
Website
Temperature
reduction
Conductive tape
positioned on
Test condition: Thermally conductive tape T2022 combined with different heat sinks (material characteristics of T2022: adhesive on both sides, silicon free,
100µm, Rth > 0,1 K/W, manufacturer: Balkhausen)
Fischerelektronik
SK18
65mm x 37.5mm
3.75 K/W
www.fischerelektronik.de
12-15°C
Full area
5-10°C
PA only
Fischerelektronik
ICK R
19 K/W
www.fischerelektronik.de
4-5°C
PA only
Fischerelektronik
ICK C17
17 K/W
www.fischerelektronik.de
3-4°C
PA only
Fischerelektronik
SFP 060-50
Aluminium Profile
80mm x 50mm x 8mm Not specified www.fischerelektronik.de
4-6°C
Full area
Fischerelektronik
SFP 007-50
Aluminium Profile
40mm x 50mm x 5mm Not specified www.fischerelektronik.de
1°C
Full area
Wakefield
Spezial A&D
13mm x 5mm
32 K/W
www.wakefield.com
2°C
PA only
Wakefield
Spezial A&D
19mm x 8mm
27 K/W
www.wakefield.com
2°C
PA only
>0,1 K/W
www.balkhausen.com
10-13°C
Full area
Test condition: Heat sink SK 18 with conductive tape TAP 005
Balkhausen
TAP 005
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adhesive on both
sides, silicon free,
125µm
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7 Reference Approval
7.1
Reference Equipment for Type Approval
The Siemens reference setup submitted to type approve MC55/56 consists of the following
components:
· Siemens MC55/56 cellular engine
· Development Support Box (DSB45)
· Flex cable (160 mm) from Hirose DF12C receptacle on MC55/56 to Hirose DF12
connector on DSB45. Please note that this cable is not included in the scope of delivery
of DSB45.
· SIM card reader integrated on DSB45
· Handset type Votronic HH-SI-30.3/V1.1/0
· PC as MMI
Antenna or 50 W
cable to system
simulator
Antenna
PC
RS-232
GSM engine
DSB45
Flex cable
160mm
DAI cable for
acoustic measuring
SIM
DAI Box
Power supply
Handset
Acoustic tester
Figure 45: Reference equipment for approval
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Compliance with FCC Rules and Regulations (MC55 only)
The FCC Equipment Authorization Certification for the MC55 reference application described
in Chapter 7.1 is listed under the
FCC identifier QIPMC55
granted to Siemens AG.
The MC55 reference application registered under the above identifier is certified to be in
accordance with the following Rules and Regulations of the Federal Communications
Commission (FCC).
“This device contains GSM 900 MHz and GSM 1800MHz functions that are not
operational in U.S. Territories.
This device is to be used only for mobile and fixed applications. The antenna(s) used
for this transmitter must be installed to provide a separation distance of at least 20 cm
from all persons and must not be co-located or operating in conjunction with any other
antenna or transmitter. Users and installers must be provided with antenna installation
instructions and transmitter operating conditions for satisfying RF exposure compliance. Antennas used for this OEM module must not exceed 7dBi gain for mobile and
fixed operating configurations. This device is approved as a module to be installed in
other devices. Each OEM must obtain their own Certification for each device
containing this module.”
IMPORTANT: Manufacturers of mobile or fixed devices incorporating MC55 modules are
advised to
· clarify any regulatory questions,
· have their completed product tested,
· have product approved for FCC compliance, and
· include instructions according to above mentioned RF exposure statements in end
product user manual.
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Compliance with FCC Rules and Regulations (MC56 only)
The FCC Equipment Authorization Certification for the MC56 reference application described
in Chapter 7.1 is listed under the
FCC identifier QIPMC56
granted to Siemens AG.
The MC56 reference application registered under the above identifier is certified to be in
accordance with the following Rules and Regulations of the Federal Communications
Commission (FCC).
“This device contains GSM 1800MHz function that is not operational in U.S. Territories.
This device is to be used only for mobile and fixed applications. The antenna(s) used
for this transmitter must be installed to provide a separation distance of at least 20 cm
from all persons and must not be co-located or operating in conjunction with any other
antenna or transmitter. Users and installers must be provided with antenna installation
instructions and transmitter operating conditions for satisfying RF exposure compliance. Antennas used for this OEM module must not exceed 7dBi gain (GSM 1900)
and 1.4dBi (GSM 850) for mobile and fixed operating configurations. This device is
approved as a module to be installed in other devices. Each OEM must obtain their
own Certification for each device containing this module.”
IMPORTANT: Manufacturers of mobile or fixed devices incorporating MC56 modules are
advised to
· clarify any regulatory questions,
· have their completed product tested,
· have product approved for FCC compliance, and
· include instructions according to above mentioned RF exposure statements in end
product user manual.
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8 List of parts and accessories
Table 39: List of parts and accessories
Description
Supplier
Ordering information
MC55/56
Siemens
Siemens ordering number: To be defined
Siemens Car Kit Portable
Siemens
Siemens ordering number: L36880-N3015-A117
DSB45 Support Box
Siemens
Siemens ordering number: L36880-N8301-A100
BB35 Bootbox
Siemens
Siemens ordering number: L36880-N8102-A100-1
Votronic Handset
VOTRONIC
Votronic HH-SI-30.3/V1.1/0
VOTRONIC
Entwicklungs- und Produktionsgesellschaft für
elektronische Geräte mbH
Saarbrücker Str. 8
D-66386 St. Ingbert
Phone: 06 89 4 / 92 55-0
Fax: 06 89 4 / 92 55-88
e-mail: contact@votronic.com
SIM card holder incl. push
button ejector and slide-in
tray
Molex
Ordering numbers:
Battery cell XWODA
Shenzhen
Xwoda
Electronic Co.,
Ltd
91228
91236
Sales contacts are listed in Table 40.
To place orders or obtain more information please
contact:
Shenzhen Xwoda Electronic Co., Ltd
Building C, Tongfukang Industrial Zone
Shiyan Town, Bao’an District
Shenzen
P.R. China
Contact:
Waichard Tsui
Phone: +86-755-27623789 ext. 370
Fax:
+86-755-27623078
Email: waichard@xwoda.com.cn
Info:
Http://xwoda.com.cn
DF12C board-to-board
connector
Hirose
See Chapter 6.3 for details on receptacle on
MC55/56 and mating headers.
Sales contacts are listed in Table 41.
U.FL-R-SMT antenna
connector
MC55/56_hid_v01.03a
Hirose
See Chapter 4.1.2 for details on U.FL-R-SMT
connector, mating plugs and cables.
Sales contacts are listed in Table 41.
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Table 40: Molex sales contacts (subject to change)
Molex
Molex Deutschland GmbH
American Headquarters
For further information
please click:
Felix-Wankel-Str. 11
4078 Heilbronn-Biberach
Germany
Lisle, Illinois 60532
U.S.A.
http://www.molex.com/
Phone: +49-7066-9555 0
Fax:
+49-7066-9555 29
Email: mxgermany@molex.com
Molex China Distributors
Beijing,
Room 1319, Tower B,
COFCO Plaza
No. 8, Jian Guo Men Nei
Street, 100005
Beijing
P.R. China
Phone: +86-10-6526-9628
Phone: +86-10-6526-9728
Phone: +86-10-6526-9731
Fax:
+86-10-6526-9730
Molex Singapore Pte. Ltd.
Jurong, Singapore
Phone: +65-268-6868
Fax:
+65-265-6044
Phone: +1-800-78MOLEX
Fax:
+1-630-969-1352
Molex Japan Co. Ltd.
Yamato, Kanagawa, Japan
Phone: +81-462-65-2324
Fax:
+81-462-65-2366
Table 41: Hirose sales contacts (subject to change)
Hirose Ltd.
For further information
please click:
http://www.hirose.com
Hirose Electric UK, Ltd
Crownhill Business Centre
22 Vincent Avenue,
Crownhill
Milton Keynes, MK8 OAB
Great Britain
Phone: +44-1908-305400
Fax: +44-1908-305401
MC55/56_hid_v01.03a
Hirose Electric (U.S.A.) Inc
2688 Westhills Court
Simi Valley, CA 93065
U.S.A.
Phone: +1-805-522-7958
Fax:
+1-805-522-3217
Hirose Electric GmbH
Zeppelinstrasse 42
73760 Ostfildern
Kemnat 4
Germany
Phone: +49-711-4560-021
Fax
+49-711-4560-729
E-mail info@hirose.de
Hirose Electric Co., Ltd.
5-23, Osaki 5 Chome,
Shinagawa-Ku
Tokyo 141
Japan
Phone: +81-03-3491-9741
Fax:
+81-03-3493-2933
Hirose Electric Co., Ltd.
European Branche
First class Building 4F
Beechavenue 46
1119PV Schiphol-Rijk
Netherlands
Phone: +31-20-6557-460
Fax:
+31-20-6557-469
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