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CM-42 Technical Description

PAGE 6 OF 38

SEM/CX-02:0076/DES A

1.5 Abbreviations

AGND

Analog GrouND

Attention command

CTS

Clear To Send

DCD

Data Carrier Detect

DFMS

Data From Mobile Station

DTMS

Data To Mobile Station

DTR

Data Terminal Ready

EMI

Electromagnetic Interference

ESD

Electrostatic Discharge

GND

Chassis GrouND

IRA

International Reference Alphabet

LSB

Least Significant Bit

Mobile Equipment

Mobile Originated

Mobile Station

Mobile Terminated

OEM

Original Equipment Manufacturer

PCB

Printed Circuit Board

PCM

Pulse Code Modulation

Personal Identification Number

Receive Data, also known as DFMS

Radio Frequency

RTS

Request To Send

SMS

Short Message Service

Transmit Data, also known as DTMS

Содержание CM-42

Страница 1: ...CM 42 Technical Description PAGE 1 OF 38 SEM CX 02 0076 DES A CM 42 Technical Description...

Страница 2: ...udio 17 2 3 5 Serial Data Interface 19 2 3 6 General Purpose Signals 20 2 3 7 System connector IO functionality 21 2 3 8 Recommended Circuitry 23 2 3 8 1 Status Group Recommended Circuitry 23 2 3 8 2...

Страница 3: ...ng Diagram 18 Figure 7 Status Diagram 23 Figure 8 HW_SD Diagram 24 Figure 9 Shutdown Sequence Diagram 25 Figure 10 Data Group Diagram 26 Figure 11 PCM Group Diagram 27 Figure 12 Analog Ground Plane Di...

Страница 4: ...eneral overview of the Technical Description and the intended use of the CM 42 module A list of related documents as well as a list of abbreviations used throughout the manual is also included Informa...

Страница 5: ...ttp www amphenolrf com 1 4 Related Documents CM 42 AT Command Manual Details the AT command interface for the CM 42 The CM 42 is based upon the following mobile standards IS 2000 Release 0 1XRTT MOB_P...

Страница 6: ...Interference ESD Electrostatic Discharge GND Chassis GrouND IRA International Reference Alphabet LSB Least Significant Bit ME Mobile Equipment MO Mobile Originated MS Mobile Station MT Mobile Termina...

Страница 7: ...are issued to the CM 42 module over an RS 232 serial port using a flexible AT command format as described in the AT Command section of this document Figure 1 CM 42 Mechanical Drawing 2 2 Mechanical De...

Страница 8: ...CM 42 Technical Description PAGE 8 OF 38 SEM CX 02 0076 DES A Figure 2 Physical Dimensions of the CM 42...

Страница 9: ...GE 9 OF 38 SEM CX 02 0076 DES A 2 3 System Connector Interface 2 3 1 Overview External interfaces to the module are made primarily through a 40 pin standard 0 050 inch pitch ODU header shown below Fig...

Страница 10: ...CM 42 Technical Description PAGE 10 OF 38 SEM CX 02 0076 DES A Pin 1 Start of odd row Pin 1 Start of odd row Pin 2 Start of even row Figure 4 Pin positions in 40 pin system connector...

Страница 11: ...CM 42 Technical Description PAGE 11 OF 38 SEM CX 02 0076 DES A Figure 5 40 pin system connector footprint...

Страница 12: ...nput 2 17 PCMCLK PCM Clock output from Module to Application 18 PCMSYNC PCM Frame sync from Module to Application 19 PCMDLD PCM Voice output from Module to Application 20 PCMULD PCM Voice input to Mod...

Страница 13: ...ower levels Applications may require output power levels similar to those in a handheld cellular phone or higher levels commonly required when in rural areas Table 3 Mobile Station Nominal Analog Powe...

Страница 14: ...The module will stay in the low power state until the Module_PWR_EN_B signal is driven low by an external open collector transistor in the application circuitry Turning the external open collector tra...

Страница 15: ...ply signal VCC_5V and VCC_12V used for AMPS burst modes Electrical characteristics Iaverage 0 7 A Ipeak 2 A Note No single GND pin can withstand over 0 5 A 2 3 3 3 Module_PWR_EN_B The Module_PWR_EN_B...

Страница 16: ...dance Zin 10 k Levels from external audio source maximum 3 77 VP P max or 2 5 dBV ATMS Sensitivity 1004 Hz tone at 900 100 mVrms generates 8kHz deviation Table 10 Audio Characteristics Application Imp...

Страница 17: ...capability over the system connector The digital audio signals enable the connection of a digital audio source The receiver is bypassing the analog audio processing functions performed within the modu...

Страница 18: ...that the read data from PCMDLD is right shifted three times and sign extended before being used 13 bit linear 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MSB LSB x x x Bit Contents D15 D03 Two complement of...

Страница 19: ...high It goes low indicating that a data or fax call is established CONNECT received from the remote modem The signal goes high when the data connection is disconnected O 25 CTS Clear To Send This sig...

Страница 20: ...wo general purpose binary output inputs The AT EGPIO command described in the CM 42 AT Command Manual allows an application to query or set the states of the two general purpose binary input output si...

Страница 21: ...s not ready to receive data It is set low when the phone module is ready to receive data I 26 DTR Logic output to phone module This signal is pulled up in the phone module R 20k This signal should be...

Страница 22: ...es the application with the logic system voltage level used by the phone module I 40 RI This signal is used to indicate to the application of an incoming call voice data etc A falling edge indicates i...

Страница 23: ...uilt in Resistor Transistor i e Toshiba RN1308 The inverting buffers should preferably be Schmitt Triggered i e Toshiba TC7S14 or similar 2 3 8 1 Status Group Recommended Circuitry The status group co...

Страница 24: ...al located on pin 2 in the system connector provides the application with its logic supply voltage The application can current amplify this signal and use it to supply its interface circuits 2 3 8 1 3...

Страница 25: ...2 This pulse is detected by the module which confirms the request by enabling its HW_SD output setting it active low 3 The application waits for the HW_SD pin to become inactive high 4 The module has...

Страница 26: ...ns six signals three output signals from application two input signals to application and one I O signal Figure 10 Data Group Diagram VREF 30 RD DFMS 25 CTS 1 100k VCC RxD CTS Phone Module Application...

Страница 27: ...er flash mode the application shall set VPPFLASH_EN active high then enable the MODULE_PWR_EN_B pin 2 3 8 3 PCM Group Recommended Circuitry The PCM group contains four signals three input signals to t...

Страница 28: ...quency digital current is not floating through the analog ground Connecting the analog ground in only one point avoids ground currents from power supplies and other high current circuitry from creatin...

Страница 29: ...as more stable and less susceptible to noise 2 3 8 4 3 Analog ground vs AGND The AGND signal output from the module is not a ground It is an analog reference which is connected to the main ground used...

Страница 30: ...gure 14 Microphone Path Diagram The microphone should preferably be connected to its pre amplifier differentially which will minimize noise picked up along the way from the microphone to its amplifier...

Страница 31: ...ference the AFMS signal from AGND to its own internal BIAS The figure shows a differential implementation C1 is chosen to create the correct HP frequency response R1 and R2 determine the gain and C2 a...

Страница 32: ...s available and also for the maximum mechanical strength For applications where a bulkhead connection is required an end launch SMA is also available For automotive applications a FAKRA type connector...

Страница 33: ...unctionality capability of the CM 42 module The module performs a set of telecom services according to TIA EIA IS 2000 The functions of the display and keypad usually used to make calls are implemente...

Страница 34: ...eactivated via the ATD command using a specific code This code might vary depending on the service provider Consult your service provider for further information 2 5 3 Short Message Services The modul...

Страница 35: ...Interim Standard Data Service Options for Wideband Spread Spectrum Systems TIA EIA IS 707 which is designed to provide async data fax and packet data transfer at various data rates Applications such a...

Страница 36: ...environmental conditions such as temperature humidity vibration etc are not beyond the limits specified for it Make sure that the signal strength is sufficient To improve signal strength move the ant...

Страница 37: ...ation distance of at least 20 centimeters must be maintained between the radiating antenna and the user or nearby persons In this mode of operation the combined connection cable path loss and antenna...

Страница 38: ...ond 30 C Spec 70 C to 85 C 3dB Degradation beyond 70 C Spec Storage temperature range 40 0 C to 85 0 C Maximum relative humidity 95 3 at 40 0 C Stationary vibration random Acceleration spectral densit...

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