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GSM/GPRS

Embedded Data/Fax/Voice Wireless Modem

MTMMC-G-F1
MTMMC-G-F2

Developer’s Guide

Содержание MTMMC-G-F1

Страница 1: ...GSM GPRS Embedded Data Fax Voice Wireless Modem MTMMC G F1 MTMMC G F2 Developer s Guide ...

Страница 2: ...son or organization of such revisions or changes Revisions Revision Level Date Description A 07 15 03 First release Patents This device is covered by patent number 5 673 268 Trademarks Trademarks of Multi Tech Systems Inc are ModemModule and the Multi Tech logo MNP and Microcom Network Protocol are registered trademarks of Microcom Inc Microsoft Windows Windows 95 and Windows NT are either registe...

Страница 3: ...TIONS 11 MECHANICAL DIMENSIONS 11 CLIMATIC AND MECHANICAL ENVIRONMENT TESTING COMPLIANCE 12 CHAPTER 3 ELECTRICAL CHARACTERISTICS 13 INTRODUCTION 13 50 PIN CONNECTOR INTERFACES 14 50 Pin Connector Description 14 Power Supply 17 Serial Link 19 ON OFF Interface 20 BOOT 22 Reset Signal RST 22 Flashing LED 23 General Purpose Input Output 24 Analog to Digital Converter 24 Audio Interface 25 SIM interfac...

Страница 4: ... INFORMATION 40 APPENDIX A SAFETY PRECAUTIONS REGULATORY STANDARDS COMPLIANCE 41 SAFETY PRECAUTIONS 41 RF Safety 41 General Safety 42 Safety Standards 42 RF Exposures 43 Instructions to OEMs 43 REGULATORY STANDARDS COMPLIANCE 44 GSM compliance 44 FTA Compliance 45 APPENDIX B SOURCING GUIDE FOR CONNECTORS AND PERIPHERAL DEVICES 46 WHERE TO FIND SMD CONNECTORS 46 GSM ANTENNA 47 SIM CARD HOLDER 47 AP...

Страница 5: ...ators ModemModule GSM GPRS is the fast track to the wireless world Figure 1 1 MultiTech s Wireless ModemModule GSM GPRS Product Description Region MTMMC G F1 GSM GPRS Class 10 900 1800 MHz Global MTMMC G F2 GSM GPRS Class 10 850 1900 MHz Global The MTMMC G F1 and MTMMC G F2 ModemModules are used to integrate wIreless data and fax communications in numerous embedded applications Scope of the Develo...

Страница 6: ...ricodec FR EFR HR Internal 3V SIM interface Easy remote control by AT commands for dedicated applications Fully Type Approved according to GSM Phase 2 specifications Board to board or board to cable mounting Fully shielded and ready to use Electrical Power supply 5 VDC 5 1A Mechanical Absolute maximum dimension 46 x 64 x 12 mm Weight 79 g Casing Complete shielding stainless steel zinc Mounting 4 s...

Страница 7: ...protocol UCS2 character set management Interfaces Single antenna interface Internal SIM interface 3V only External SIM interface 3V or 5V For Data Operation Serial link Remote control by AT commands GSM 07 07 and 07 05 Baud rate from 300 to 115 200 bits s From 300 up to 38400 bits s with autobauding The integrated modem has a sole 50 pin connector which gathers all the interface signals in order t...

Страница 8: ...with supplementary services such as call forwarding call barring multiparty call waiting and call hold calling line identification advice of charge USSD closed user group and explicit call transfer Management Features The ModemModule GSM GPRS provides advanced management features including phone book management fixed dialing number real time clock and alarm management Industry standard Modem Comma...

Страница 9: ...periodically need to send or receive data over a wireless network It is an ideal device for Appliances Remote Diagnostics ATM Terminals Remote Metering Automotive Security Systems Data Collection Vending Gaming Machines Gas Pumps Other devices requiring wireless connectivity Industrial and Medical Remote Monitoring Systems Note The Wireless MultiModem must be mounted with at least 8 inches 20 cm o...

Страница 10: ...ector a SIM holder and a RF connector Interface Connector Figure 1 2 Mechanical Description A Holes for Mounting Screws 4 Hole dia 0 087 SIM Reader Antenna Connector MMCX type SIM ejection button Figure 1 3 Mechanical Description B Four screw holes allow the ModemModule to be fixed on the mother PCB The ModemModule can be mounted indifferently on both sides top or bottom For further details see Ch...

Страница 11: ...Chapter 2 Mechanical Specifications Wireless ModemModule MTMMC G F1 and MTMMC G F2 Developer s Guide 11 Chapter 2 Mechanical Specifications Mechanical Dimensions Figure 2 1 ModemModule Dimensions ...

Страница 12: ...EC 68 2 2 Bb test 70 O C 72 hours 70 O C 72 hours 55 O C 16 hours Change of Temperature IEC 68 2 14 Na Nb test 40 O 30 O C 5 cycles t1 3 hours 20 O 30 O C GSM 3 cycles 10 O 30O C DCS 3 cycles t1 3 hours Damp Heat Cyclic IEC 68 2 30 Db test 30 O C 2 cycles 90 100 RH variant 1 40 O C 2 cycles 90 100 RH variant 1 40 O C 2 cycles 90 100 RH variant 1 Damp Heat IEC 68 2 56 Cb test 30 O C 4 days 40 O C 4...

Страница 13: ...G F1 and MTMMC G F2 Developer s Guide 13 Chapter 3 Electrical Characteristics Introduction This chapter describes the ModemModule s electrical interfaces These are interfaces on the 50 pin general purpose connector power and data signaling RF interface SIM interface ...

Страница 14: ... RI O CMOS 2X Ring Indicator 10 SPK2P O Analog Speaker 2 positive output 11 Flashing LED I O CMOS 2X Working mode indication LED Driven by module 12 SPK1P O Analog Speaker 1 positive output 13 CT106 CTS O 1X Clear to Send 14 SPK1N O Analog Speaker 1 negative output 15 ON OFF I Power ON OFF control ON Vcc 16 MIC2P I Analog Microphone 2 positive input 17 AUXV0 I Analog Auxiliary ADC input 18 MIC2N I...

Страница 15: ...column 35 ROW4 I O 1X Keypad row 36 COL0 I O 1X Keypad column 37 ROW2 I O 1X Keypad row 38 ROW3 I O 1X Keypad row 39 ROW0 I O 1X Keypad row 40 ROW1 I O 1X Keypad row 41 NC Not Connected 42 SPI_EN O 1X SPI enable 43 SPI_IO I O 1X I 2 C Data or SPI Data 44 SPI_CLK O 2X I 2 C Clock or SPI Clock 45 SIMCLK O 2X Clock for SIM interface 3V mode 46 SIMRST O 2X Reset for SIM interface 3V mode 47 SIMVCC O S...

Страница 16: ...veloper s Guide 16 Table 3 2 Operating Conditions Parameter I O Type Min Max Condition Vinput low CMOS 0 5V 0 8V Vinput high CMOS 2 1V 3 0V 1X 0 2V IOL 1mA 2X 0 2V IOL 2mA Voutput low 3X 0 2V IOL 3mA 1X 2 6V IOH 1mA 2X 2 6V IOH 2mA Voutput high 3X 2 6V IOH 3mA Figure 3 1 50 Pin Connector ...

Страница 17: ... modem Otherwise serious dysfunctions may appear However the modem does not have to constantly deliver 1A current at 5V on this power supply This power supply is internally regulated to a nominal value VBATT Table 3 3 Power Supply Pin Description Pin Number Name Description Comment 1 GND Ground High Current 2 GND Ground High Current 3 5V Ground High Current 4 5V Ground High Current 6 GND Ground Hi...

Страница 18: ...I5 270 mA 320 mA 5V Average 1Rx 1Tx PcI8 180 mA 200 mA 5V Average idle mode 100 mA 300 mA 5V Average GPRS CI 10 3Rx 2Tx PcI5 540 mA 640 mA 5V Average GPRS CI 10 3Rx 2Tx PcI8 360 mA 400 ma 5V Average Idle mode 2 2 mA 3 Ma Power Control Level PcI5 2W typ PcI8 0 5W typ Table 3 7 Power Consumption in GSM GRPS 1800 MHz and GSM GRPS 1900 MHz Class 10 Conditions INOM IMAX 5V During TX bursts PcI0 1 3 A p...

Страница 19: ...Set Ready CT107 DSR The set of RS232 signals can be required for GSM DATA services application The 2 additional signals are Data Carrier Detect CT109 DCD and Ring Indicator CT125 RI Table 3 8 Serial Link Pin Description Signal Pin Number I O I O Type Description CT103 TX 25 I CMOS Transmit serial data CT104 RX 28 O 1X Receive serial data CT105 RTS 30 I CMOS Ready to send CT106 CTS 13 O 1X Clear to...

Страница 20: ...GND MAX 3238 This application note is valid for Vcc 3 0 Volt see MAX 3238 specifications Auto shut down mode is not used in this example Figure 3 3 Level Shifter Application Diagram for Serial Link ON OFF Interface This input is used to switch ON or OFF the ModemModule A high level signal has to be provided on the ON OFF pin to switch on the modem The level of the voltage of this signal has to be ...

Страница 21: ...ommand Manual for more details and via hardware line See the diagrams below ON OFF AT CPOF Serial Link to ModemModule OK response Serial Link from ModemModule About 500 ms ModemModule Status ___ ON OFF___ Figure 3 4 Power Off Procedure 1 ON OFF AT CPOF Serial Link to ModemModule OK response Serial Link from ModemModule ___ ON OFF___ About 500 ms ModemModule Status About 500 ms Figure 3 5 Power Off...

Страница 22: ...rmal mode Table 3 10 BOOT Pin Description Signal Pin Number I O I O Type Description BOOT 23 I CMOS SW downloading See Table 3 2 Operating Conditions in section on the 50 pin Connector Description Reset Signal RST This signal is used to force a reset of the ModemModule It has to be used by providing low level during approximately 2ms This signal has to be considered as an emergency reset only A re...

Страница 23: ...onditions Parameter Min Max Condition VT 1 1 V 1 2 V VT 1 7 V 1 9 V VOL 0 4 V IOL 50 microamperes VOH 2 0 V IOH 50 microamperes VT VT hysteresis level Flashing LED The flashing LED signal is used to indicate the working mode of the ModemModule Table 3 14 Flashing LED Pin Description Signal Pin Number I O I O Type Description Flashing LED 11 I O CMOS 2X Working mode indication LED See Table 3 2 Ope...

Страница 24: ...e GPIO value via AT WIOW and AT WIOR See AT Command manual for more details Analog to Digital Converter The ModemModule has an Analog to Digital converter ADC input This converter is a 10 bits one ranging from 0 to 2 5V You can see the measurements via AT ADC See AT Command manual for more details Table 3 17 A D Converter Pin Description Signal Pin Number I O I O Type Description AUXV0 17 I Analog...

Страница 25: ...re the standard ones for a handset design while MIC1 inputs can be connected to an external headset or a hands free kit The gain of MIC2 inputs is internally adjusted The gain can be tuned from 30dB to 51dB The connection to the microphone is direct The gain can be tuned using the AT VGR command See Appendix B Sourcing Guide for Connectors and Peripheral Devices MIC2N MIC2P C1 C1 22pF to 100 pF 33...

Страница 26: ...in of MIC1 inputs is internally adjusted The gain can be tuned from 30dB to 51dB The gain can be tuned using the AT VGR command C1 C2 R1 R2 R3 R4 Vcc analog power supply 2 8 V MIC1P MIC1N Differential Connection Figure 3 9 Microphone 1 Input R1 R4 from 100 to 330 R2 R3 usually between 1K and 3 3K as per the microphone characteristics C1 22pF to 100pF C2 47µF R1 and R4 are used as a voltage supply ...

Страница 27: ... good filtering as well as shielding in order to avoid any disturbance on the audio path SPK2P C1 Differential Connection SPK2P SPK2N Single Ended Connection Figure 3 10 Speaker 2 Output C1 from 100nF to 47µF as per the speaker characteristics and the output power Using a single ended connection also includes losing half of the output power compared to a differential connection Table 3 21 Speaker ...

Страница 28: ...ne a very good filtering as well as a shielding in order to avoid any disturbance on the audio path SPK1P C1 Differential Connection SPK1P SPK1N Single Ended Connection Figure 3 11 Speaker 1 Output C1 from 100nF to 47µF as per the speaker characteristics Using a single ended connection also includes losing half of the output power compared to a differential connection Table 3 22 Speaker 1 Output P...

Страница 29: ...st be pulled down to GND with 1 K This interface is fully compliant with GSM 11 11 recommendations concerning the SIM functionality Transient Voltage Suppressor diodes are internally added on the signals connected to the SIM socket in order to prevent any Electro Static Discharge TVS diodes with low capacitance less than 10pF are connected on SIMCLK and SIMDATA to avoid any disturbance of the risi...

Страница 30: ...TA SIMCLK VOH Source current 20mA SIMVCC 0 1V V SIMRST SIMDATA SIMCLK VOL Sink current 200mA 0 1 SIMVCC Output Voltage ISIMVCC 6mA 2 70 2 80 2 85 V SIMCLK Rise Fall Time Loaded with 30pF 50 ns SIMRST SIMDATA Rise Fall Time Loaded with 30pF 1 ms SIMCLK Frequency Loaded with 30pF 3 25 MHz Table 3 25 SIM Socket Pin Description Signal Pin Number Description Vcc 1 SIMVCC RST 2 SIMRST CLK 3 SIMCLK CC4 4...

Страница 31: ...d Interface This interface provides 10 connections 5 rows R0 to R4 and 5 columns C0 to C4 The scanning is a digital one and the de bouncing is done in the integrated modem No discrete components like R C Resistor Capacitor are needed It is possible to scan the column and rows using the AT CMER command See AT Command manual for more details Table 3 27 Keypad Interface Pin Description Signal Pin Num...

Страница 32: ...emModule LED and ModemModule Status Signal ModemModule Status OFF Download mode or switched OFF Continuously lit Switched ON not registered on the network ON Flashing Switched ON registered on the network SIM Interface The internal SIM interface of the SocketModule supports 3V SIMs only Note This interface is fully compliant with GSM 11 11 recommendations concerning the SIM functionality Five Sign...

Страница 33: ...2 dB Maximum output power DCS PCS 30 dBm 2 dB Minimum output power EGSM 5 dBm 5 dB Minimum output power DCS PCS 0 dBm 5 dB H2 level 30 dBm H3 level 30 dBm Noise in 925 935 MHz 67 dBm Noise in 935 960 MHz 79 dBm Noise in 1805 1880 MHz 71 dBm Phase error at peak power 5 RMS Frequency error 0 1 ppm max DTE DCE Interface Rates The table below indicates the anticipated modem to computer interface rates...

Страница 34: ...Chapter 5 Test Board Wireless ModemModule MTMMC G F1 and MTMMC G F2 Developer s Guide 34 Chapter 5 Test Board Serial Test Demo Board Components ...

Страница 35: ...Chapter 5 Test Board Wireless ModemModule MTMMC G F1 and MTMMC G F2 Developer s Guide 35 Serial Test Demo Board Block Diagram Block Diagram for the ModemModule GSM GPRS ...

Страница 36: ...1 13 2 15 14 4 3 M0 VIN DVCC SS M1 C1 C1 GND CLK CIN VCC RIN RST I O DDRV DATA Place C30 near pin 13 of U6 GND C17 2 2uF SIMCLK R21 0 C_GPO0 C43 2 2uF R13 100K VCC VIN GND GND C28 1uF R20 R21 R22 and R23 are used to shunt LTC1555 SIM interface from Modem Module C30 33uF R20 0 SIMVCC R23 0 SIMPRES1 GND 4 7K 10K 47K 47K U4 UMC5NT1 1 4 5 3 2 SIMDATA J2 SIM_6P 1 2 3 4 5 6 7 8 VCC RST CLK CC4 GND VPP I...

Страница 37: ...is a major issue in the choice of the antenna cable type length performances thermal resistance etc These elements could affect GSM performances such as sensitivity and emitted power The antenna should be isolated as much as possible from the digital circuitry including the interface signals MultiTech recommends shielding the terminal On terminals including the antenna a poor shielding could drama...

Страница 38: ...through the implementation of the serial link level shifter See Figure 3 3 Level Shifter Application Diagram for Serial Link Terminal Emulator Setup Here below is an example based on the Windows TM Hyperterminal application terminal emulator program Setup 1 Go to START PROGRAMS ACCESSORIES HYPERTERMINAL 2 Start the Hyperterminal software 3 Give the name of your choice click on the icon of your cho...

Страница 39: ...aneous ETSI GSM 02 07 03 40 03 41 04 08 04 10 04 11 06 10 06 11 06 12 06 31 06 32 07 01 09 07 and G 01 v4 2 1 DCS ph2 Miscellaneous ETSI GSM 02 07 03 40 03 41 04 08 04 10 04 11 06 10 06 11 06 12 06 31 06 32 07 01 09 07 and G 01 v4 2 1 You can find the documents on ETSI Contacts ETSI Secretariat F 06921 Sophia Antipolis cedex France 06921 Sophia Antipolis cedex France 06921 Sophia Antipolis cedex F...

Страница 40: ...ntipolis Cedex France Tel 33 0 4 92 94 42 00 Fax 33 0 4 93 65 47 16 Global Engineering Documents manages a collection of more than one million documents from over 460 organizations worldwide http global ihs com Phone 800 854 7179 Fax 303 792 2192 The ITU is the leading publisher of telecommunication technology regulatory and standard information with over 4 000 titles in printed form on CD ROM and...

Страница 41: ...ty standards had been tested it has been concluded that the product was fitted for use If you are concerned about exposure to RF energy there are things you can do to minimize exposure Obviously limiting the duration of your calls will reduce your exposure to RF energy In addition you can reduce RF exposure by operating your cellular modem efficiently by following the below guidelines Efficient Mo...

Страница 42: ... Children Do not allow children to play with your modem It is not a toy Children could hurt themselves or others by poking themselves or others in the eye with the antenna for example Children could damage the modem or make calls that increase your modem bills Blasting Areas To avoid interfering with blasting operations turn your unit OFF when in a blasting area or in areas posted turn off two way...

Страница 43: ... or intends to be used in portable applications within 20 cm of the body of the user and such uses are strictly prohibited To ensure that the unit complies with current FCC regulations limiting both maximum RF output power and human exposure to radio frequency radiation a separation distance of at least 20cm must be maintained between the unit s antenna and the body of the user and any nearby pers...

Страница 44: ... The unit is tested at room temperature and must be fully operative for the main RF parameters Warehouse Test Low temperature IEC 68 2 1 Under normal conditions room temperature after the test the unit must behave in full conformity with the main RF parameters Warehouse Test High temperature IEC 68 2 2 Under normal conditions room temperature after the test the unit must behave in full conformity ...

Страница 45: ...umbers 000000 to 999999 GSM 900 1900 TAC 500 100 FAC 11 Serial Number 000000 to 999999 GSM GPRS 900 1800 TAC 500161 FAC 11 Serial Numbers 000000 to 999999 GSM GPRS 900 1900 TAC 500167 FAC 11 Serial Number 000000 to 999999 CE Label The Wireless ModemModule is CE compliant which implies that the modem is in conformity with the European Community directives and it bears the CE label Carrying out test...

Страница 46: ... com Many SAMTEC products are available via SAMTEC dealers throughout the world Connector data sheets are presented later in this appendix Figure B 1 High and Low Profile Connectors SAMTEC Reference Number for High Profile Connector FLE 125 01 G DV SAMTEC Reference Number for Low Profile Connector CLP 125 02 L D Figure B 2 Flexible Flat Cable Reference Number for Flexible Flat Cable SD 25 01 N Fig...

Страница 47: ...equency RX 869 to 894 MHz 925 to 960 MHz 1805 to 1880 MHz 1930 to 990 MHz Frequency TX 824 to 849 MHz 880 to 915 MHz 1710 to 1875 MHz 1850 to 910 MHz RF Power Stand 2W at 12 5 duty cycle 2W at 12 5 duty cycle 1W at 12 5 duty cycle 1W at 12 5 duty cycle Impedance 50 ohms VSWR 2 Typical Radiated Gain 0 dBi on azimuth plane The ModemModule requires an MMCX plug to connect to an antenna Figure B 6 MMC...

Страница 48: ...eneral Commands CGMI Manufacturer Identification CGMM Request Model Identification CGMR Request Revision Identification CGSN Product Serial Number CSCS Select TE Character Set CIMI Request IMSI CCID Card Identification GCAP Capabilities List A Repeat Last Command CPOF Power Off CFUN Set Phone Functionality CPAS Phone Activity Status CMEE Report Mobile Equipment Errors CKPD Keypad Control CCLK Cloc...

Страница 49: ...hone Selection ECHO Echo Cancellation SIDET Side Tone Modification VIP Initialize Voice Parameters CSNS Single Numbering Scheme Network Service Commands CSQ Signal Quality COPS Operator Selection CREG Network Registration WOPN Read Operator Name CPOL Preferred Operator List Security Commands CPIN Enter PIN CPIN2 Enter PIN2 CPINC PIN Remaining Attempt Number CLCK Facility Lock CPWD Change Password ...

Страница 50: ...iting Supplementary Services Commands CCFC Call Forwarding CLCK Call Barring CPWD Modify SS Password CCWA Call Waiting CLIR Calling Line Identification Restriction CLIP Calling Line Identification Presentation COLP Connected Line Identification Presentation CAOC Advice Of Charge CACM Accumulated Call Meter CAMM Accumulated Call Meter Maximum CPUC Price Per Unit and Currency Table CHLD Call Related...

Страница 51: ...FCR Capability to Receive FDIS Current Sessions Parameters FDCC DCE Capabilities Parameters FLID Local ID String FPHCTO Page Transfer Timeout Parameter V24 V25 Commands IPR Fixed DTE Rate ICF DTE DCE Character Framing IFC DTE DCE Local Flow Control C Set DCD Signal D Set DTR Signal S Set DSR Signal O Back to Online Mode Q Result Code Suppression V DCE Response Format Z Default Configuration W Save...

Страница 52: ...onverters Measurements CMER Mobile Equipment Event Reporting WLPR Read Language Preference WLPW Write Language Preference WIOR Read GPIO Value WIOW Write GPIO Value WAC Abort Command WTONE Play Tone WDTMF Play DTMF Tone WDWL MultiTech Downloading WVR MultiTech Voice Rate WDR Data Rate WHWV Hardware Version WDOP Date Of Production WSVG MultiTech Select Voice Gain WSTR MultiTech Status Request WSCAN...

Страница 53: ...mity EN Enable ETSI European Telecommunications Standards Institute FAC Final Assembly Code FR Full Rate FTA Full Type Approval GND Ground GPIO General Purpose Input Output GPRS General Packet Radio Service GSM Global System for Mobile Communication HR Half Rate IMEI International Mobile Equipment Identity MO Mobile Originated MT Mobile Terminated OEM Original Equipment Manufacturer PDA Personal D...

Страница 54: ... 8 9 13 19 38 46 Data Carrier Detect 19 53 dB 12 33 53 DCS 12 33 39 44 digital 7 24 31 37 DTE DCE Interface Rates 33 dual band 5 E EFR 6 8 53 Electrical Characteristics 13 EMC protection 37 emergency calls 8 ESD protection 37 ETSI 33 39 44 53 Explicit Call Transfer 7 F fax 5 7 fixed dialing number 8 FR 6 8 53 G gain 25 26 43 general purpose 13 15 GND 14 15 17 29 30 38 53 GPIO 24 52 53 GPRS 1 5 6 7...

Страница 55: ... 5 7 8 10 13 33 37 41 42 43 44 47 RST 14 22 23 30 S serial link 7 19 37 38 signal 20 22 23 29 31 32 SIM5 6 7 10 13 15 29 30 31 32 36 37 39 45 47 51 53 SIM Toolkit 7 51 SIMCLK 15 29 30 32 SIMDATA 15 29 30 32 SIMPRES 15 SIMRST 15 29 30 32 SIMVCC 15 29 30 32 SMS 5 6 8 49 53 socket 6 15 29 speaker 25 27 28 37 Specifications technical 10 SPI 15 31 SPK1N 14 28 SPK1P 14 28 T Technical specifications 10 t...

Страница 56: ... Boot Procedure 22 Figure 3 7 Reset Procedure 22 Figure 3 8 Microphone 2 Input 25 Figure 3 9 Microphone 1 Input 26 Figure 3 10 Speaker 2 Output 27 Figure 3 11 Speaker 1 Output 28 Figure 3 12 SIM Socket 31 Figure 3 13 SIM Schematic 36 Figure 4 1 ModemModule Test SM Card Layout Error Bookmark not defined Figure 4 2 ModemModule Test SM Board Block Diagram Error Bookmark not defined Figure B 1 High an...

Страница 57: ...ditions 23 Table 3 14 Flashing LED Pin Description 23 Table 3 15 LED and ModemModule Status 23 Table 3 16 General Purpose I O Pin Description 24 Table 3 17 A D Converter Pin Description 24 Table 3 18 A D Converter Electrical Characteristics 24 Table 3 19 Microphone 2 Input Pin Description 25 Table 3 20 Microphone 1 Input Pin Description 26 Table 3 21 Speaker 2 Output Pin Description 27 Table 3 22 ...

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