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

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RX 9 User Manual HTML Version

Manual

INTEGRATOR’S MANUAL FOR

NOKIA 12

RX-2, RX-9

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 ANTENNA INSTALLATION ...................................................................................................................... 20

5. 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

6. CERTIFICATIONS............................................................................................................................................... 24

6.1.1 RX-2: ...................................................................................................................................................... 25

6.1.2 RX-9 ....................................................................................................................................................... 25

6.2 TECHNICAL REQUIREMENTS................................................................................................................... 25

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

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.

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

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

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.

1/26

The dimensions of the Nokia 12 are shown in Figure 1.

Figure 1 Physical dimensions of the Nokia 12 GSM module

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.

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 Upper limit depending on IO

voltage

Operating temperature range - 10…+55 °C

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 pull-

down 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.

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.

5/26

Figure 2 Pin numbering of the Nokia 12 M2M system connector

Name Pin Pin Name

VBB 1 2 GND

VBB 3 4 GND

VBB 5 6 GND

VBB 7 8 GND

VBB 9 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

6/26

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

1 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 fuse-

protected, 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.

2 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.

3 VBB See PIN 1

4 GND See PIN 2

5 VBB See PIN 1

6 GND See PIN 2

7 VBB See PIN 1

8 GND See PIN 2

9 VBB See PIN 1

10 GND See PIN 2

11 NC 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.

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.

9/26

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

Ana-

log

read

Digi-

tal

read

Digi-

tal

write

AT User M2M Note

OUTPUT1 53 x x x Functions as P3RX, when

serial port 3 in use

OUTPUT2 30 x x x DCD, when serial port 1 in

use (=AT command mode,

FBUS, Corba over D9)

OUTPUT3 31 x x x DSR, when serial port 1 in

use (=AT command mode,

FBUS, Corba over D9)

OUTPUT4 32 x x x CTS, when serial port 1 in

use (=AT command mode,

FBUS, Corba over D9)

OUTPUT5 33 x X x RI, when serial port 1 in

use (=AT command mode,

FBUS, Corba over D9)

OUTPUT6 57 x x X x

10/26

OUTPUT7 58 x x X x

OUTPUT8 42 x x X x

OUTPUT9 44 x x X x

INPUT11 46 x x X x

INPUT4 54 x x X x Functions as P3TX, when

serial port 3 in use

INPUT5 35 x X x Functions as DTR, when

serial port 1 in use (=AT

command mode, FBUS,

Corba over D9)

INPUT6 34 x X x Functions as RTS, when

serial port 1 in use (=AT

command mode, FBUS,

Corba over D9)

INPUT7 56 x x X x

INPUT8 43 x x X x

INPUT9 59 x x X x

INPUT10 55 x x X x

PCMDCLK 21 x X x Digital audio

PCMTX 23 x X x Digital audio

PCMSCLK 22 x X x Digital audio

PCMRX 24 x X x Digital audio

AD1 36 x x X x

AD2 20 x x X x

AD3 19 x x X x

PORT2RX 38 x AM serial port

PORT2TX 39 x AM serial port

PORT2RT

40 x AM serial port

PORT2CT

41 x AM serial port

MIC+ 15 x x x Analog audio

EAR+ 16 x x x Analog audio

EAR- 17 x x x Analog audio

MIC- 18 x x x Analog audio

Table 11 Pin functionalities in different operating modes

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

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 RS-

232 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.

13/26

Supplier Part Number Description

Amphenol M-C707_10M006_522_2 SIM reader with lid open

indication switch

Table 12 Possible SIM card reader supplier

755

321

DATA NC G ND

CLK RST VSIM

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 AUDIO INTERFACE

3.6.1 Analog Audio

The M2M system connector gives possibilities to build different kind of audio applications

around the Nokia12.

14/26

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 Type Max Units

Differential input voltage range

for microphone input (MicP &

MicN)

0.316 2.0 VPP

Microphone amplifier input

resistor

RMIC 30 50 kΩ

Common mode voltage level VCM 1.3 1.35 1.4 V

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 Min Type Max Units

Output voltage

swing in fully

differential mode

EarP to EarN 0.316 2 VPP

Output resistance 1 Ω

Load resistance EarP to EarN (with

dynamic transducer)

30 45

Ω

Load resistance EarP to EarN (with

external audio

circuitry)

1 kΩ

Load capacitance EarP to EarN (with

external audio

circuitry)

10 nF

Common voltage

level for Earphone

output

VCMEar 0.75 0.8 0.85 V

Offset voltage -50 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.

15/26

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.

MicP

MicN

VANA

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.

16/26

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.

17/26

Shutdown control

Bias

Differential Audio

Boomer

EarP

EarN +

Bypass

VDD

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).

18/26

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.

15 14 13 12 11 10

LSBMSBSign extended

PCMDClk

PCMSClk

PCMTxData

PCMRxData

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

19/26

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.

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

Microsoft Mobile Oy GSM/EGPRS 850/1900 M2M Module PRODUCT NAME E

Manual

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