Microsoft RX-9 GSM/EGPRS 850/1900 M2M Module User Manual PRODUCT NAME E

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NOKIA 12
RX-2, RX-9
Copyright © Nokia 2003-2004. All rights reserved.
Copyright ©2003-2004 Nokia. All rights reserved | Date: 28.01.04, ver. 1.2
INTEGRATOR’S MANUAL FOR
Contents
1.
INTRODUCTION ...................................................................................................................................................1
2.
MECHANICAL INTEGRATION .............................................................................................................................1
3.
ELECTRICAL INTEGRATION ................................................................................................................................3
3.1
M2M SYSTEM CONNECTOR........................................................................................................................3
3.1.1 ELECTRICAL CHARACTERISTICS............................................................................................................4
3.1.2 CONNECTOR PIN-OUT............................................................................................................................5
3.2
GROUNDING.............................................................................................................................................. 12
3.3
POWER SUPPLY........................................................................................................................................ 12
3.4
SERIAL COMMUNICATION....................................................................................................................... 13
3.4.1 AT COMMAND MODE........................................................................................................................... 13
3.4.2 M2M SYSTEM MODE............................................................................................................................ 13
3.5
SIM INTERFACE......................................................................................................................................... 13
3.6
AUDIO INTERFACE ................................................................................................................................... 14
3.6.1 ANALOG AUDIO.................................................................................................................................... 14
3.6.2 ANALOG AUDIO EXAMPLE.................................................................................................................. 16
3.6.3 ACOUSTIC ECHO ................................................................................................................................... 18
3.7
DIGITAL AUDIO......................................................................................................................................... 18
3.7.1 SIGN-EXTENDED LINEAR CODE ......................................................................................................... 19
4.
RF AND ANTENNA INTEGRATION ................................................................................................................. 20
4.1
5.
6.
ANTENNA INSTALLATION ...................................................................................................................... 20
TEST BOARD FOR THE NOKIA 12 .................................................................................................................. 21
5.1
POWERING ................................................................................................................................................ 21
5.2
SIM CARD READER ................................................................................................................................... 21
5.3
RS-232 CONVERTERS .............................................................................................................................. 22
5.4
AUDIO......................................................................................................................................................... 22
CERTIFICATIONS ............................................................................................................................................... 24
6.1.1 RX-2: ...................................................................................................................................................... 25
6.1.2 RX-9 ....................................................................................................................................................... 25
6.2
TECHNICAL REQUIREMENTS................................................................................................................... 25
Copyright © Nokia 2003-2004. All rights reserved.
6.2.1 SIM TESTING ........................................................................................................................................ 25
6.2.2 POWER SUPPLY ................................................................................................................................... 25
6.2.3 EMC/ESD AND SAFETY ........................................................................................................................ 25
6.2.4 RF TESTING........................................................................................................................................... 26
6.2.5 RF EXPOSURE ....................................................................................................................................... 26
6.2.6 OTHER TYPE APPROVAL ISSUES ....................................................................................................... 26
Legal Notice
Copyright © 2003-2004 Nokia. All rights reserved.
Reproduction, transfer, distribution or storage of part or all of the contents in this document in any form without the
prior written permission of Nokia is prohibited.
Nokia and Nokia Connecting People are registered trademarks of Nokia Corporation. Other product and company
names mentioned herein may be trademarks or tradenames of their respective owners.
Nokia operates a policy of continuous development. Nokia reserves the right to make changes and improvements
to any of the products described in this document without prior notice.
Under no circumstances shall Nokia be responsible for any loss of data or income or any special, incidental,
consequential or indirect damages howsoever caused.
The contents of this document are provided "as is". Except as required by applicable law, no warranties of any
kind, either express or implied, including, but not limited to, the implied warranties of merchantability and fitness
for a particular purpose, are made in relation to the accuracy, reliability or contents of this document. Nokia
reserves the right to revise this document or withdraw it at any time without prior notice.
RX-9:
FCC/INDUSTRY CANADA NOTICE
Your device may cause TV or radio interference (for example, when using a telephone in close proximity to
receiving equipment). The FCC or Industry Canada can require you to stop using your telephone if such
interference cannot be eliminated. If you require assistance, contact your local service facility. This device
complies with part 15 of the FCC rules. Operation is subject to the condition that this device does not cause
harmful interference.
Copyright © Nokia 2003-2004. All rights reserved.
References
Ref 1.
Nokia 12 Product Specification
Ref 2.
Nokia 12 AT Command List
Abbreviations
API
Application Programming Interface
AT
Attention Command Language
ATK
Application Tool Kit
BER
Basic Encoding Rule
CDC
Connected Device Configuration
CE
Mark for a product that fulfils the EU safety and R&TTE requirements
CHAP
Challenge Handshake Authentication Protocol
CLDC
Connected Limited Device Configuration
CORBA
Common Object Request Broker Architecture
CS
Coding Scheme
CSD
Circuit Switched Data
DCE
Data Circuit Terminating Equipment
DTE
Data Terminal Equipment
EDGE
Enhanced Data rates for Global Evolution
EGPRS
Enhanced General Packet Radio Service
EGSM
Extended GSM
EMC
Electro-Magnetic Compatibility
EU
European Union
GCF
GSM Certification Forum
GGSN
Gateway GPRS Support Node
GPRS
General Packet Radio Service
GPS
Global Positioning System
GSM
Global System for Mobile Communication
Hi-Z
High Impedance
HSCSD
High Speed Circuit Switched Data
HW
Hardware
IMEI
International Mobile Station Equipment Identity
Copyright © Nokia 2003-2004. All rights reserved.
IMP
Information Module Profile
IP
Internet Protocol
ISDN
Integrated Services Digital Network
ISO
International Organization for Standardization
J2EE
Java 2 Enterprise Edition
J2ME
Java 2 Micro Edition
J2SE
Java 2 Standard Edition
LOCI
Local Information
M2M
Machine to machine
MIDP
Mobile Information Device Profile
MMCX
Miniature Microax Connector
MSISDN
Mobile Subscriber International ISDN Number
ORB
Object Request Broker
OTA
Over The Air
PC
Personal Computer
PCM
Pulse Code Modulation
PIN
Personal Identification Number
PP
Point-to-Point
PUK
PIN Unblocking Key
RF
Radio Frequency
RS232
Recommended Standard 232 Revision C
RTC
Real Time Clock
RX-2
Type designation of Nokia 12
SIM
Subscriber Identity Module
SMS
Short Message Service
SMSC
SMS Centre
SW
Software
TCP
Transmission Control Protocol
TLV
Type/Tag Length Value
UDP
User Datagram Protocol
USSD
Unstructured Supplementary Service Data
WMS
Wireless Messaging
Copyright © Nokia 2003-2004. All rights reserved.
1.
INTRODUCTION
The Nokia 12 GSM connectivity module has been designed for M2M (machine-to-machine)
applications and other wireless solutions. There are two versions of the Nokia 12:
•
RX-2 dual-band GSM device supporting EDGE, GPRS, HSCSD, CSD, and SMS in EGSM 900/GSM
1800 MHz bands
•
RX-9 dual band GSM device supporting EDGE, GPRS, CSD, SMS in GSM 850/GSM 1900 MHZ
bands.
The Nokia 12 can be used in several applications due to its three different operating modes.
Simple I/O applications can be easily implemented using the Nokia 12 in the User control mode
that offers message personalising, secure messaging, and timing functionality for SMS controlled
I/O applications. Additional intelligence for I/O applications can easily be implemented with
Java. In the AT command mode, the Nokia 12 can be used as a GSM modem that supports Java
for creating extra intelligence. In modem use, all supported bearers are available, subject to
network support.
The Nokia 12 is compatible with the Nokia M2M Platform. In the M2M system mode, the Nokia 12
communicates with the server application through the Nokia M2M Gateway, and all the
compatible features of the Nokia 12 are available for developing a wide range of M2M
applications.
In addition to these operating modes, the Nokia 12 has an integrated TCP/IP stack which
enables direct GPRS or GSM data connection between a remote end application and a server
application. Due to the integrated TCP/IP stack, the HTTP and Socket APIs of the Nokia 12 are
available for application development.
In addition to the bearers and operating modes listed above, the Nokia 12 supports several Java
APIs, location service for external GPS module integration, reliability features like AutoPIN, GSM
encryption and security codes, reset mechanism and Nokia M2M Platform authentication. Java™
technology support enables upgrading the application software over the air, and smart
messaging makes the installation flexible. GSM phase 2+ supplementary services enable
developing voice applications.
Note that all data bearers as well as TCP/IP are dependent on network support.
This document describes the main characteristics of the Nokia 12 and is intended to help the
system integrator both integrate the Nokia 12 in an application and gain the correct approvals.
Basic product information is available in Ref 1.
2.
MECHANICAL INTEGRATION
The Nokia 12 contains two holes for mounting screws. The screws can be used in mounting, but
are not compulsory. The Nokia 12 has been tested according to the automotive standard DIN
72300-3. The module can be assembled to various applications without the screws.
Copyright © Nokia 2003-2004. All rights reserved.
1/26
The dimensions of the Nokia 12 are shown in Figure 1.
Figure 1 Physical dimensions of the Nokia 12 GSM module
Copyright © Nokia 2003-2004. All rights reserved.
2/26
3.
ELECTRICAL INTEGRATION
3.1
M2M SYSTEM CONNECTOR
All signals are routed through the M2M system connector, except the antenna, which is routed
through the MMCX RF connector.
The M2M system connector is a 60-pin (2 rows, 30 per row) 1.27 mm pitch pin header connector.
It has a frame that helps in the assembly and also holds the Nokia 12 firmly in position.
The possible mating connector is described in Table 1.
Supplier
Part Number
Description
SAMTEC
SFMC-130-02-S-D
Female connector. Board-to-board
SAMTEC
SFM-130-02-S-D
Female connector. Board-to-board.
With alignment mark.
Table 1 Possible mating connectors for the application
Parameter
Value
Supply voltage
+4.2 V
DC input voltage (any signal pin)
-0.5…5.5 V
DC output source or sink current
(any I/O pin)
Operating temperature range
-25…+55 °C
Storage temperature range
-40…+85 °C
Table 2 Absolute maximum ratings
The recommended operating conditions in Table 3 define the conditions for actual device
and/or interface operation.
Copyright © Nokia 2003-2004. All rights reserved.
3/26
Parameter
Value
Note
Supply Voltage (VBB)
3.6…4.0 V (3.8V typical)
Voltage must never drop
below the low limit
Logic voltage (IO voltage)
1.8…5.0 V
DC output source or sink
current (any I/O pin, user
adjustable)
0…5 V
Operating temperature range
- 10…+55 °C
Upper limit depending on IO
voltage
Table 3 Recommended operating conditions
3.1.1
Electrical characteristics
All digital outputs (1-9) are open drain outputs, and all pins have a 10 kohm pull-up resistor to
IO voltage.
Parameter
Value
Application load resistance
>100 kohm
Application load capacitance
<100 pF
High level output voltage (Io=-20uA)
0.67*IO voltage minimum
Low level output voltage (Io=1mA)
0.4 V maximum
Table 4 Digital output characteristics
Analog inputs (AD1-3) have an input range of 2.7 V. All analog inputs have a 100 kohm pulldown resistor inside the module. AD channels are calibrated in production and calibrated range
is from 0.03V to 2.77V Accuracy not guaranteed outside calibrated range.
Parameter
Nominal
Input impedance
100 kohm
Input voltage range
0-2.8 V
Resolution
10 bits
Integral non-linearity
+/- 6mV
Differential non-linearity
+/-9mV
Temperature drift
< 5mV
Table 5 Analog input characteristics
All digital inputs (4-11) are CMOS inputs, and all pins have a 10 kohm pull-up resistor to IO
voltage.
Copyright © Nokia 2003-2004. All rights reserved.
4/26
Parameter
Value
Application driving impedance
<100 ohm
Low level input voltage (IO_Voltage 1.8-5V)
0.15 V max.
High level input voltage (IO_Voltage 1.8-5V)
1.6V min.
Table 6 Digital input characteristics
Parameter
Nominal
Note
Differential input voltage
range for microphone input
(MicP & MicN)
0.316 Vpp
2.0 Vpp maximum
Microphone amplifier input
resistor
50 kohm
30 kohm minimum
Table 7 Microphone input characteristics
Parameter
Nominal
Note
Differential output voltage for
earphone output (EARP&EARN)
0.316 Vpp
2.0 Vpp maximum
Load resistance
1 kohm
30 ohm minimum
Table 8 Earphone output characteristics
The IO Voltage pin 52 selects the logic level of all digital outputs/inputs. The specifications of the
digital audio interface are the same as the digital inputs and outputs specifications.
All the M2M system connector pins can handle 4 kV ESD (human body model).
3.1.2
Connector pin-out
The odd number pins (1, 3, 5, 7…) are on one side of the connector and the even number pins (2,
4, 6, 8…) on the other side. Numbering and pin-out are shown in Figure 2 and Table 9.
Copyright © Nokia 2003-2004. All rights reserved.
5/26
Figure 2 Pin numbering of the Nokia 12 M2M system connector
Name
Pin
Pin
Name
VBB
GND
VBB
GND
VBB
GND
VBB
GND
VBB
10
GND
NC
11
12
NC
NC
13
14
NC
MICP
15
16
EARP
MICN
17
18
EARN
AD3
19
20
AD2
PCMDCLK
21
22
PCMSCLK
PCMTX
23
24
PCMRX
RESET T
25
26
RESET A
PORT1RX
27
28
MBUS
PORT1TX
29
30
OUTPUT2
OUTPUT3
31
32
OUTPUT4
OUTPUT5
33
34
INPUT6
INPUT5
35
36
AD1
Copyright © Nokia 2003-2004. All rights reserved.
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BSI
37
38
PORT2RX
PORT2TX
39
40
PORT2RTS
PORT2CTS
41
42
OUTPUT8
INPUT8
43
44
OUTPUT9
SLEEPX
45
46
INPUT11
VSIM
47
48
SIMRST
SIMCLK
49
50
SIMDATA
SIMDET
51
52
IO VOLTAGE
OUTPUT1/P3RX
53
54
INPUT4/P3TX
INPUT10
55
56
INPUT7
OUTPUT6
57
58
OUTPUT7
INPUT9
59
60
NC
Table 9 M2M system connector pin-out
More detailed descriptions and usage of pins are shown in Table 10 and Table 11.
Pin
Name
Description
VBB
Terminal Power. Voltage nominal 3.8 V, 3.6 V – 4.0 V, maximum current 2A
peak. Regulated power input for the Nokia 12. All VBB pins must be
connected together at the application end. The device end is not fuseprotected, so the application should provide sufficient overload protection.
Current consumption can be as high as 2 amps peak when transmitting at
full power. Average power consumption is about 500 mA at the maximum.
The power supply should be designed according to this. If the operating
voltage falls below 3.4 V, the device automatically shuts down. See chapter
3.3.
GND
Return ground for device power. These pins are used for device power
(VBB) return ground. Connect to common ground. All GND pins must be
connected at the application end. See chapter 3.2.
VBB
See PIN 1
GND
See PIN 2
VBB
See PIN 1
GND
See PIN 2
VBB
See PIN 1
GND
See PIN 2
VBB
See PIN 1
10
GND
See PIN 2
11
NC
Reserved
Copyright © Nokia 2003-2004. All rights reserved.
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12
NC
Reserved
13
NC
Reserved
14
NC
Reserved
15
MICP
MICP is used with analog audio as differential positive input. The line is AC
coupled at the device end. Frequency response is 300 Hz-3400 Hz. See
chapter 3.6.1.
16
EARP
EARP is used with analog audio as differential positive output. Frequency
response is 300 Hz-3400 Hz. See chapter 3.6.1.
17
MICN
MICN is used with analog audio as differential negative input. The line is AC
coupled at the device end. Frequency response is 300 Hz-3400 Hz. See
chapter 3.6.1.
18
EARN
EARN is used with analog audio as differential negative output. Frequency
response is 300 Hz-3400 Hz. See chapter 3.6.1.
19
AD3
Input for 10 bit Analog to Digital converter. The application end must scale
voltage level between 0 to 2.8 V
20
AD2
See PIN 19
21
PCMDCLK
PCMDCLK is a 512 kHz digital audio clock from the application module. For
digital audio usage, refer to chapter 3.7. Logic level is set by the IO voltage
pin (pin 52). See chapter 3.7.
22
PCMSCLK
PCMSCLK is one PCMDCLK cycle and repeats every 64 PCMDCLK cycles. Frame
sync frequency is thus is 8 kHz. Logic level is set by the IO voltage pin (pin
52). See chapter 3.7.
23
PCMTX
Digital audio, transmit data from device to application. Logic level is set by
the IO voltage pin (pin 52). See chapter 3.7.
24
PCMRX
Digital audio, received data from application to module. Logic level is set by
the IO voltage pin (pin 52). See chapter 3.7.
25
RESET T
Reset input for module, active low. Module is reset when this line is low.
Logic level is set by the IO voltage pin (pin 52). Minimum duration TBD.
26
RESET A
Reset output for application, active low. Reset goes high after xx ms of
power-up. Logic level is set by the IO voltage pin (pin 52).
27
PORT1RX
PORT1 receive. PORT1RX is an asynchronous serial channel receive pin.
Functionality otherwise as in pin 29, PORT1TX. Logic level is set by the IO
voltage pin (pin 52).
28
MBUS
Nokia-specific test pin. Do not connect.
29
PORT1TX
PORT1 transmit. PORT1RX is an asynchronous serial channel transmit pin
and can be used with pin28, FBUSRX to form a full duplex serial link. Pins
30-35 can be used to provide handshaking functions. Logic level is set by
the IO voltage pin (pin52)
30
OUTPUT2
Digital output from device. Logic level is set by the IO voltage pin (pin 52). If
the AT command mode is active, this pin is used as Data Carrier Detect
output for Port 1.
Copyright © Nokia 2003-2004. All rights reserved.
8/26
31
OUTPUT3
Digital output from module. Logic level is set by the IO voltage pin (pin 52).
If the AT command mode is active, this pin is used as Data Set Ready output
for Port 1.
32
OUTPUT4
Digital output from module. Logic level is set by the IO voltage pin (pin 52).
If the AT command mode is active, this pin is used as Clear To Send output
for Port 1.
33
OUTPUT5
Digital output from module. Logic level is set by the IO voltage pin (pin 52).
If the AT command mode is active, this pin is used as Ring Indicator output
for Port 1.
34
INPUT6
Digital input to module. Logic level is set by the IO voltage pin (pin 52). If
the AT command mode is active, this pin is used as Request To Send input
for Port 1.
35
INPUT5
Digital input to module. Logic level is set by the IO voltage pin (pin 52). If
the AT command mode is active, this pin is used as Data Terminal Ready
input for Port 1
36
AD1
Input for 10 bit Analog to Digital converter. The application end must scale
voltage level between 0 to 2.8 V.
37
BSI
Input for 10 bit Analog to Digital converter. The application end must scale
voltage level between 0 to 2.8 V.
38
PORT2RX
PORT2 receive. PORT2RX is an asynchronous serial channel receive pin and
is used with pin 39. Pins 40 and 41 provide handshaking signals for the
UART. Logic level is set by the IO voltage pin (pin 52).
39
PORT2TX
PORT2 Transmit. PORT2RX is an asynchronous serial channel transmit pin
and is used with pin 38. Pins 40 and 41 provide handshaking signals for the
UART. Logic level is set by the IO voltage pin (pin 52).
40
PORT2RTS
Request To Send for PORT2. PORT2RTS provides handshaking signal for
asynchronous communication between terminal and application module
when using PORT2. Works together with pin 41. Logic level is set by the IO
voltage pin (pin 52).
41
PORT2CTS
Clear to send for PORT2. PORT2CTS provides handshaking signal for
asynchronous communication between terminal and application module
when using PORT2. Works together with pin 40. Logic level is set by the IO
voltage pin (pin 52).
42
OUTPUT8
Digital output to module. Logic level is set by the IO voltage pin (pin 52).
43
INPUT8
Digital input to module. Logic level is set by the IO voltage pin (pin 52).
44
OUTPUT9
Digital output to module. Logic level is set by the IO voltage pin (pin 52).
45
SLEEPX
Sleep indicator from module. When module is in the sleep mode, the level
of this output pin is low, otherwise high. Logic level is set by the IO voltage
pin (pin 52).
46
INPUT11
Digital input to module. Logic level is set by the IO voltage pin (pin 52).
47
VSIM
Operating voltage for SIM card, generated by module. See chapter 3.5.
Copyright © Nokia 2003-2004. All rights reserved.
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48
SIMRST
Reset signal for SIM card, generated by module. See chapter 3.5.
49
SIMCLK
Clock signal for SIM card, generated by module. See chapter 3.5.
50
SIMDATA
Data line between SIM card and module. See chapter 3.5.
51
SIMDET
SIM card detection signal. See chapter 3.5.
52
IO VOLTAGE
Logic level for the application is set by this pin. Voltage must be 1.8 V - 5.0
V. See chapter 3.3.
53
OUTPUT1 /
PORT3RX
Digital output to module. Logic level is set by the IO voltage pin (pin 52). If
PORT3 UART is used, this is receive signal.
Note: Direction changes if used as UART.
54
INPUT4 /
PORT3TX
Digital input to module. Logic level is set by the IO voltage pin (pin 52). If
PORT3 UART is used, this is transmitter signal.
Note: Direction changes if used as UART.
55
INPUT10
Digital input to module. Logic level is set by the IO voltage pin (pin 52).
56
INPUT7
Digital input to module. Logic level is set by the IO voltage pin (pin 52).
57
OUTPUT6
Digital output to module. Logic level is set by the IO voltage pin (pin 52).
58
OUTPUT7
Digital output to module. Logic level is set by the IO voltage pin (pin 52).
59
INPUT9
Digital input to module. Logic level is set by the IO voltage pin (pin 52).
60
NC
Table 10 Pin descriptions
Logical pin
name
Physical pin
number
OUTPUT1
53
OUTPUT2
Analog
read
Digital
read
User
M2M
Note
Functions as P3RX, when
serial port 3 in use
30
DCD, when serial port 1 in
use (=AT command mode,
FBUS, Corba over D9)
OUTPUT3
31
DSR, when serial port 1 in
use (=AT command mode,
FBUS, Corba over D9)
OUTPUT4
32
CTS, when serial port 1 in
use (=AT command mode,
FBUS, Corba over D9)
OUTPUT5
33
RI, when serial port 1 in
use (=AT command mode,
FBUS, Corba over D9)
OUTPUT6
57
Copyright © Nokia 2003-2004. All rights reserved.
Digital
write
AT
10/26
OUTPUT7
58
OUTPUT8
42
OUTPUT9
44
INPUT11
46
INPUT4
54
Functions as P3TX, when
serial port 3 in use
INPUT5
35
Functions as DTR, when
serial port 1 in use (=AT
command mode, FBUS,
Corba over D9)
INPUT6
34
Functions as RTS, when
serial port 1 in use (=AT
command mode, FBUS,
Corba over D9)
INPUT7
56
INPUT8
43
INPUT9
59
INPUT10
55
PCMDCLK
21
Digital audio
PCMTX
23
Digital audio
PCMSCLK
22
Digital audio
PCMRX
24
Digital audio
AD1
36
AD2
20
AD3
19
PORT2RX
38
AM serial port
PORT2TX
39
AM serial port
PORT2RT
40
AM serial port
PORT2CT
41
AM serial port
MIC+
15
Analog audio
EAR+
16
Analog audio
EAR-
17
Analog audio
MIC-
18
Analog audio
Table 11 Pin functionalities in different operating modes
Copyright © Nokia 2003-2004. All rights reserved.
11/26
3.2
GROUNDING
There is only one common ground for the power supply and I/Os in the Nokia 12 GSM module.
There are no separate analog/digital ground pins in the M2M system connector.
All ground pins must be connected together at the application end. Grounding through screws is
not allowed. The mounting screws must be isolated from the application ground.
3.3
POWER SUPPLY
The Nokia 12 GSM module is powered by an application. The operating voltage must not fall
below the specification limit under any circumstances. The recommended operation conditions
are shown in Table 3. For example, at full power, the TX can be up to 2 A, when current drawn
from the power supply. There are no capacitors on the power supply line of the Nokia 12, so the
application must provide sufficient filtering.
The power supply must be capable of supplying at least 3 W average power, but it is
recommended that the power supply provides also the peak current. Otherwise a large capacitor
bank is needed to compensate the voltage drop during transmit bursts.
The Nokia 12 does not have protection for over-voltage of current, so the application must be
equipped with one if there is a possibility for over-voltage. The application should at least
include a fuse.
The ripple on the operating voltage must not exceed 100 mV and the voltage must never drop
below 3.6 V during operation.
The application must also produce IO voltage. The logic levels of digital inputs and outputs
correspond to this IO voltage. IO voltage can be supplied from a linear regulator.
Figure 3 Example powering with simple DC/DC converter and linear regulator
Copyright © Nokia 2003-2004. All rights reserved.
12/26
3.4
SERIAL COMMUNICATION
The Nokia 12 GSM module is accessible through three different asynchronous serial interfaces
with different protocols. The pins provide one asynchronous channel with a simple handshaking
capability.
The first asynchronous channel is provided by PORT1. This port can be used with full 8 signal RS232 handshaking signals.
The second asynchronous channel is provided by PORT2 with a simple handshaking capability
(only RTS and CTS).
The third asynchronous channel is provided by PORT3 with no hardware handshakes.
The usage of ports can be configured with the Nokia 12 Configurator software. Nokia 12
Configurator is downloadable at www.forum.nokia.com free of charge.
Serial communication speeds for all serial ports can be selected between 9600 – 115 200 bps.
3.4.1
AT command mode
PORT1 can be set to the AT command mode by setting a 68 kohm resistor between BSI (pin 37)
and the ground. The Nokia 12 GSM module has to be re-started (power off/on) to identify the
resistor.
The Nokia 12 provides all signals for the industry standard DB9 RS-232C connection. An external
level converter is required. The Nokia 12 is DCE (Data Communication Equipment) and the
application is DTE (Data Terminal Equipment). One possible method of implementing the level
conversions is to use MAX3237 or an equivalent level converter IC.
If BSI (pin 37) is left floating in the application, all PORT1 handshaking pins can be used as a
general I/O.
3.4.2
M2M system mode
PORT2 uses the M2M system protocol. PORT3 can also be used by the JAVA Imlet as a serial port
or as digital input and output pins.
3.5
SIM INTERFACE
All leads from the M2M system connector to the SIM card reader must be shorter than 15 cm,
because the voltage drop and increasing capacitance will affect timing. Only an external
component besides the SIM card reader is a bypass capacitor in the VSIM line (100 n
recommended, as close as possible to the reader).
The leads between the Nokia 12 M2M system connector and the SIM card reader must be
protected against interferences. The striplines must be placed to the interlayers, never to the
PWB overlayer.
A possible SIM card reader supplier is shown in Table 12.
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Supplier
Part Number
Description
Amphenol
M-C707_10M006_522_2
SIM reader with lid open
indication switch
Table 12 Possible SIM card reader supplier
DATA
NC
GND
CLK
RST
V S IM
Figure 4 SIM connections
The Nokia 12 GSM module supports 1.8 V and 3 V SIM cards. The Nokia 12 automatically sets the
correct voltage for the SIM card used.
The SIM card reader must have a switch that indicates when the SIM card is being removed, so
that it can be shut down correctly by the Nokia 12. The switch must open when the card is
removed or the lid is open. The Nokia 12 has a pull-up in the SIM detection line, so the
application must connect the other end of the switch to the ground.
3.6
3.6.1
AUDIO INTERFACE
Analog Audio
The M2M system connector gives possibilities to build different kind of audio applications
around the Nokia12.
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The analog TX path (from the external application to the Nokia 12 GSM module) has a DC
isolation inside the Nokia 12 with 100 nF capacitors, and these capacitors together with the
microphone preamplifier input impedance form a 1st order high pass filter with 32 Hz roll off (-3
dB).
Name
Symbol
Min
Differential input voltage range
for microphone input (MicP &
MicN)
Type
Max
Units
0.316
2.0
VPP
Microphone amplifier input
resistor
RMIC
30
50
Common mode voltage level
VCM
1.3
1.35
kΩ
1.4
Table 13
The earphone lines from the Nokia 12 GSM module are driven differentially to achieve the best
possible audio quality, free of radio frequency noise. In the differential mode, positive output is
driven from EarP and negative signal from EarN output.
Name
Test condition
Output voltage
swing in fully
differential mode
EarP to EarN
Min
Type
Max
Units
0.316
VPP
Ω
45
Ω
Output resistance
Load resistance
EarP to EarN (with
dynamic transducer)
30
Load resistance
EarP to EarN (with
external audio
circuitry)
Load capacitance
EarP to EarN (with
external audio
circuitry)
Common voltage
level for Earphone
output
VCMEar
Offset voltage
0.75
-50
kΩ
0.8
10
nF
0.85
50
mV
Table 14
The following chapters give examples of using the audio properties of the Nokia 12 for voice
communication purposes. The circuits presented here illustrate the connection methods. There
are also other possibilities for using the Nokia 12 audio interface. The component values
presented here are examples only; the customer can adjust the application-specific values to
achieve the best performance for the application in use.
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3.6.2
Analog audio example
Analog TX path: Due to the small audio signal level of the electret microphone, it is
recommended to use a pre-amplifier for the microphone before connecting it to the Nokia 12
GSM module. The differential connection is strongly recommended to protect against RF noise. A
microphone pre-amplifier with 20 dB input gain is recommended for reasonable uplink audio
levels.
Microphone input: See Figure 5.
VANA
R4
R5
VANA
C1
R3
C2
MicP
VANA
R6
R7
R1
VANA
C3
MicN
R2
Figure 5 Single-ended microphone pre-amplifier
Analog RX path: In voice applications, the Nokia 12 is able to drive an earphone application
without external electronics. However, it is also possible to build a high volume loudspeaker
application by using an external power amplifier with a high sensitivity loudspeaker. The
following chapters show example circuits for both cases.
Earphone application: An earphone can be connected to the Nokia 12 GSM module without
external components. However, Figure 6 shows external components for EMC purposes to
optimise audio quality and reliability.
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R1
L1
R2
C1
C2
J1
J2
Figure 6 Earphone application circuit
The recommended earphone type is dynamic. The maximum allowed load for this application is
32 ohm. In the example circuit, L1 is the common mode choke for the suppression of common
mode disturbance in the earphone lines. J1 and J2 are surge protector gaps for ESD protection.
These can be replaced with varistor or any other state-of-the-art ESD protection component. C1
and C2 are used for RF noise filtering. R1 and R2 are used as an attenuator if the signal level
from the Nokia 12 is too high for the application. These resistors can be replaced with linear
potentiometers and thus get adjustable volume control for the earphone application. The
following component list gives example values for the circuit:
•
L1= 1000ohm@100MHz
•
C1=C2=27pF
•
R1=R2= Must be defined together with the sensitivity of the earphone
External Audio Power amplifier: External audio power must be used if there is intent to drive
low impedance load as loudspeaker. In Figure 7 an example connection circuit for differential
audio boomer is shown. In this application only the connection interface to the Nokia 12 is
presented. For more detailed information on the boomer connections and specification, see the
boomer manufacturer application note.
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VDD
C4
R2
Differential Audio
Boomer
VDD
EarP
EarN
C1
R1
C2
R3
R5
R4
VDD R6
Bypass
Bias
C3
Shutdown control
Figure 7 Differential external power amplifier connection
Refer to Audio Boomer Manufacturer and loudspeaker application notes for information on
maximum safe ratings for selected components. Also keep in mind the limitation of Vdd to avoid
overdriving the Audio Boomer and thus distorting the output signal unnecessarily.
3.6.3
Acoustic Echo
Because in a GSM voice call the uplink and downlink audios are activated at the same time, use
common sense when evaluating a suitable distance between the loudspeaker and the
microphone. The acoustic echo canceller inside the Nokia 12 is tuned so that the optimum result
is achieved with 20 cm or longer distance between the microphone and the speaker. It is also
advisable to locate the microphone and the loudspeaker so that they are pointed away from
each other to achieve the best possible double-talk performance.
3.7
DIGITAL AUDIO
There is a PCM codec interface in the Nokia 12 for digital audio support. The digital audio
interface supports sign-extended 13-bit linear code (total 16 bits are transmitted).
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3.7.1
Sign-Extended Linear Code
PCM (Pulse Code Modulation) digital audio data transmission between the Nokia 12 and the
application is handled with four signals: PCMDCLK, PCMSCLK, PCMTX, and PCMRX. The format of
the data transmission is sign-extended 13-bit linear code. Total of 16 bits are transmitted, and
higher order bits must be sign-extended. Transmission of data commences after frame sync
(PCMSCLK) rises high for one PCMDCLK clock cycle. After returning low, each data bit is
transmitted on the falling edge of PCMDCLK.
PCMDClk
PCMSClk
PCMTxData
Sign extended
15
PCMRxData
14
13
Sign extended
MSB
12
LSB
11
10
MSB
LSB
Figure 8
Both PCMDCLK and PCMSCLK must be provided by the application. PCMDCLK frequency is 512 kHz
and PCMSCLK is repeated at 8 kHz, i.e. at every 64th clock cycle. All other but the 16 data bits
following the frame sync are discarded. PCMDCLK has typical duty-cycle of 50 %; a variation of 5
% can be tolerated. For detailed timing, refer to Figure 9 and Table 15. Tcyc is the cycle time of
the 512 kHz clock, that is 1.953 microseconds. The PCMSCLK rising edge must occur at the
maximum of 8 ns after the PCMSCLK rising edge.
The pulse width of the Frame Sync pulse should be one Data Clock cycle.
Figure 9 PCM Timing Diagram
Table 15 For example Motorola Type MC145483 Codec supports this coding format
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4.
RF AND ANTENNA INTEGRATION
There are two versions of the Nokia 12:
•
RX-2 dual-band GSM device supporting EDGE, GPRS, HSCSD, CSD, and SMS in EGSM 900/GSM
1800 MHz bands
•
RX-9 dual band GSM device supporting EDGE, GPRS, CSD, SMS in GSM 850/GSM 1900 MHZ
bands.
RX-2 12 RF requirements follow the ETSI EGSM900/GSM1800 phase2+ specifications.
RX-9 12 RF requirements follow the ETSI GSM850/GSM1900 phase2+ specifications.
Parameter
Value
Description
RF impedance
50 ohm
RF power
2W (class 4)
EGSM900 & GSM 850
1W (class 1)
GSM1800 & GSM 1900
Table 16 Nokia 12 RF specifications
The RF signal from the Nokia 12 to an external antenna goes trough the MMCX connector.
An adapter cable between the MMCX connector and the antenna may be needed. Suitable
connectors and cables are available for example from Amphenol, TYCO, and IMS Connector
Systems.
The Nokia 12 GSM module is certified with a Smarteq dual-band antenna (art no: 1140.26 for
900/1800MHz and 1140.27 for 850/1900MHz). Suitable antennas are available for example from
Smarteq and Hirschmann.
See also 6.2.5 RF Exposure.
4.1
ANTENNA INSTALLATION
The antenna must be placed to a good RF field; a location where the signal strength is adequate.
A hand-portable phone can be used to check the best location for the antenna.
Electronic devices can cause interference, which affects the performance of the Nokia 12. Do not
place the antenna close to electric devices or other antennas.
If an additional cable is needed between the antenna and the Nokia 12, use low-loss cables (for
example RG-58. Amphenol, Suhner, etc.) and connectors. Every additional cable, adapter, and
connector increases the loss of signal power.
See also 6.2.5 RF Exposure.
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When designing the application, it is important to take care of RF emissions. Do not place any
sensitive components or striplines near the antenna or the antenna connector.
5.
TEST BOARD FOR THE NOKIA 12
The test board is a hardware development tool for application developers and system
integrators. It manages DC voltages, SIM card, I/O’s, and audios. You can measure several
interfaces by pin headers, and the software interfaces of D9 connectors can be seen and
handled. The device can be reset with the reset button on the test board PWB.
The Nokia 12 has been type approved with this test board.
5.1
POWERING
A 3A step down converter is used to produce module Vcc. Low ESR capacitors are used.
Figure 10
5.2
SIM CARD READER
The SIM card reader is directly connected to the M2M system connector. The VSIM decoupling
capacitor must be present in all designs.
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Figure 11
5.3
RS-232 CONVERTERS
All three serial ports of the Nokia 12 are equipped with RS-232 level translators and D9
connector in the test board. If they are not used, there is a switch to set it in the Hi-Z mode.
5.4
AUDIO
For testing analog audio, the test board includes a connector for the Nokia HSU-3 handset. HSU-3
can be purchased from Nokia dealers.
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Figure 12 Test board microphone amplifier
The test board and its components are shown in Figure 13. Switch usage can be seen in
Figure 14.
Figure 13 Test board components
Copyright © Nokia 2003-2004. All rights reserved.
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Figure 14 Switch usage in test board
6.
CERTIFICATIONS
The test house requires the following documentation from the application integrator for type
approval tests:
•
Hardware description
•
Schematics
•
Block diagram
•
PWB/component layout
•
Bill of materials
•
HW/SW versions used in tests.
•
Summary of application
•
User’s guide
If the application HW or SW changes, the integrator is responsible for verifying the effect, and if
needed, perform all required tests again in an accredited laboratory.
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6.1.1
RX-2:
The Nokia 12 GSM module is a CE marked device. In order to show compliance to R&TTE
requirements, the integrator has to show that all the instructions in this document have been
followed in the integration, and a declaration of conformity has been written. The final product
must carry CE marking to show compliance with all the directives that are applicable to it. The
numbers of all the Notified Bodies involved in every aspect of the conformity assessment must
be shown next to the CE Marking with any additional marking that can be needed (e.g. Alert
symbol for WLAN). The technical documentation explains the role of each Notified Body. If
external elements are designed according to this document, only the following tests must be
carried out in an accredited laboratory:
•
EMC tests in all working modes (EN 301 489-1/7, TS 51.010)
•
Safety (Europe: EN/IEC 60950)
6.1.2
RX-9
The Nokia 12 GSM module is an FCC equipment authorized device (47CFR 15, 22, 24). If external
elements are designed according to this document, only the following tests must be carried out
in an accredited laboratory:
•
6.2
6.2.1
FCC equipment authorization (all applicable parts of 47CFR15)
TECHNICAL REQUIREMENTS
SIM testing
SIM testing is not needed, because the SIM card reader is a passive component. In the
implementation, SIM presence must follow the type approval conditions of the Nokia 12 GSM
module. 6- or 8-pin SIM card readers may be used.
6.2.2
Power supply
The power supply must be designed as advised in chapter 3.3. If this specification is exactly
followed and fulfilled, the number of RF tests is minimized in the type approval process.
If the power supply specification is not followed, the Nokia 12 type approval is not valid.
6.2.3
EMC/ESD and Safety
EMC and safety tests according to GSM standards (EN 301 489-1/7, TS 51.020 and EN 60 950) are
mandatory and must be completed by the application integrator. The integrator should
guarantee overall ESD protection in the integrated application (EN 301 489).
Note: The test board is an ESD supersensitive device.
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6.2.4
RF testing
The antenna must be connected to the Nokia 12 GSM module as this document instructs. The
antenna impedance has to be as specified in chapter 4. Further passive RF testing for the type
approval is not required. Radiation performance is always the responsibility of the integrator.
If the antenna specification is not followed, the Nokia 12 type approval is not valid.
6.2.5
RF Exposure
In order to comply with the RF exposure requirements, install the antenna so that a minimum
separation distance of 20 cm can be maintained between the antenna and all persons.
If other antenna than the one in the sales package is used, it must be ensured that the
maximum antenna gain of 3dBi is not exceeded.
RX-2:
If the application does not provide a separation distance of at least 20 cm, the integrator must
carry out all needed certifications.
RX-9:
The Nokia 12 cannot be used in the applications that allow the separation distance between
antenna and all persons to be less than 20 cm.
6.2.6
Other type approval issues
Changes in the application software have no effect on type approval issues.
If the Nokia 12 software is updated, no type approval actions are required from the application
integrator. All Nokia products are officially type approved.
Any changes to RF path are not allowed. Power supply instructions must be followed.
RX-9:
Type label has the FCC ID number to indicate that RX-9 is FCC equipment authorized. If the
application prevents the label from being visible, the application must be labelled so that it
contains the text: “Contains FCC ID LJPRX-9”.
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