Multitech MMCModem MTMMC-G-F4 Instruction Manual

MMCModem™GPRS
Embedded Wireless Modem
MTMMC-G-F4
Developer's Guide

Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 2
MMCModem™GPRS Developer’s Guide
MTMMC-G-F4
PN S000445D, Version D
Copyright
This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-
Tech Systems, Inc. All rights reserved.
Copyright © 2007-2009, by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranty with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech
Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof
without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.
Revisions
Revision Date Description
A09/24/07 Initial release.
B 03/27/08 Add information for finding SMD connectors. Added directions for changing the
quad band. Changed the Power Usage data.
C06/04/08 Incorporate a new mechanical drawing. Remove the Hazardous Locations
statement.
D 06/01/09 Added a link to Multi-Tech Web site that links to the Multi-Tech Warranty
statement. Changed product ordering information. Removed fax information.
Changed the numbering on the Pin Connector drawing (bottom view). Added a
note about TXD, DTR, RTS input signals being the only 5V tolerant signals.
Warranty
For warranty information, see the Multi-Tech Web site at
http://www.multitech.com/COMPANY/Policies/warranty/
Trademarks
MMCModem is a trademark of Multi-Tech Systems, Inc. The Multi-Tech logo is a registered trademark of Multi-Tech
Systems, Inc.
Microsoft Windows is a registered trademark of Microsoft Corporation in the United States and other countries.
World Headquarters
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
Phone: [phone] or 800-328-9717
Fax: [phone]
Internet Address: http://www.multitech.com
Technical Support
Country By Email By Phone
Europe, Middle East, Africa: [email protected] (44) 118 959 7774
U.S., Canada, all others: [e-mail] 800-972-2439 or 763-717-5863

Table of Contents
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 3
Table of Contents
Chapter 1 – Product Description and Specifications..............................................................................5
Introduction...........................................................................................................................................5
AT Command Information ...................................................................................................................5
Product Ordering Information.............................................................................................................5
Safety Notices and Warnings..............................................................................................................6
Wireless Safety................................................................................................................................6
Safety Standards..............................................................................................................................6
Instructions to OEMs........................................................................................................................7
Specifications .......................................................................................................................................8
Chapter 2 – Mechanical Drawing.............................................................................................................10
Chapter 3 – Electrical Characteristics ....................................................................................................11
Introduction.........................................................................................................................................11
50-Pin Connector Interface................................................................................................................12
Power Supply Pins Electrical Interface..........................................................................................15
Serial Link Electrical Interface........................................................................................................16
ON / ~OFF Electrical Interface.......................................................................................................17
BOOT Electrical Interface ..............................................................................................................18
Reset Signal (~RST) Electrical Interface.......................................................................................19
Flashing LED Electrical Interface...................................................................................................20
General Purpose Input/Output Electrical Interface ........................................................................20
Analog to Digital Converter Electrical Interface .............................................................................20
Audio Electrical Interface ...............................................................................................................21
SIM Electrical Interface..................................................................................................................25
SPI Bus Electrical Interface ...........................................................................................................27
Keypad Electrical Interface ............................................................................................................27
Chapter 4 – Non-Electrical Interfaces.....................................................................................................28
Flashing LED.......................................................................................................................................28
SIM Interface .......................................................................................................................................28
RF Interface.........................................................................................................................................29
RF Connector.................................................................................................................................29
RF Performances...........................................................................................................................29
DTE/DCE Interface Rates...................................................................................................................29
Chapter 5 – Test Board.............................................................................................................................30
Serial Test/Demo Board Components..............................................................................................30
Serial Test/Demo Board Block Diagram...........................................................................................31
Chapter 6 – Application Considerations.................................................................................................32
Hardware and RF................................................................................................................................32
Firmware Upgrade..............................................................................................................................32
Changing the GPRS Quad Band.......................................................................................................32
Getting Started & Terminal Emulator Setup....................................................................................33

Table of Contents
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 4
Minimum Hardware Interface Required To Get Started ................................................................33
Terminal Emulator Setup ...............................................................................................................33
Appendix A – Peripheral Devices............................................................................................................34
Antenna System..................................................................................................................................34
SIM Card Holder..................................................................................................................................35
Where to Find SMD Connectors........................................................................................................36
Appendix B – Compliance Statements...................................................................................................37
Waste Electrical and Electronic Equipment Statement..................................................................37
Restriction of the Use of Hazardous Substances (RoHS)..............................................................38
Information on HS/TS Substances According to Chinese Standards ..........................................39
Information on HS/TS Substances According to Chinese Standards (in Chinese).....................40
Index...........................................................................................................................................................41

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 5
Chapter 1 – Product Description and
Specifications
Introduction
The Multi-Tech MMCModem™GPRS wireless modem offers standards-based quad-band GPRS Class
10 performance. Packaged in a compact, rugged industrial chassis, this quick-to-market communications
device allows developers to add wireless communication to products with a minimum of development time
and expense. The MMCModem GPRS wireless modem is based on industry-standard open interfaces
and can be board-to-board or board-to-cable mounted.
AT Command Information
AT commands for the MMCModem GPRS wireless modem are published in separate Reference Guides
included on the product CD and posted on the Multi-Tech web site. These include the GPRS AT
Commands and GRPS-IP Commands.
Product Ordering Information
Product Description Region
MTMMC-G-F4 GSM/GPRS 850/1900 MHz default Global
MTMMC-G-F4-ED GSM/GPRS 900/1800 MHz default Global
MTMMC-DK MTMMC-G Developer Kit Global
ED stands for the European default.
DK stands for Developer Kit. This kit allows you to plug in the MMCModem GPRS and use it for
testing, programming and resolving application issues.

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 6
Safety Notices and Warnings
Note to OEMs: The following safety statements may be used in the documentation of your final
product applications.
Wireless Safety
General Safety
The MMCModem is designed for and intended to be used in fixed locations and mobile
applications. “Fixed” means that the device is physically secured at one location. “Mobile” means
that the device can be carried and transported.
Caution: Maintain a separation distance of at least 20 cm (8 inches) is normally
maintained between the transmitter’s antenna and the body of the user or nearby
persons. The MMCModem is not designed for or intended to be used in portable
applications within 20 cm. (8 inches) of the body of the user.
RF Interference Issues
It is important to follow any special regulations regarding the use of radio equipment due in
particular to the possibility of radio frequency, RF, interference. Please follow the safety advice
given below carefully.
•Switch OFF your wireless MMCModem when in an aircraft. The use of cellular
telephones in an aircraft may endanger the operation of the aircraft, disrupt the cellular
network and is illegal. Failure to observe this instruction may lead to suspension or denial
of cellular telephone services to the offender, or legal action or both.
•Switch OFF your wireless MMCModem when around gasoline or diesel-fuel pumps and
before filling your vehicle with fuel.
•Switch OFF your wireless MMCModem in hospitals and any other place where medical
equipment may be in use.
•Respect restrictions on the use of radio equipment in fuel depots, chemical plants or
where blasting operations are in progress.
•There may be a hazard associated with the operation of your wireless MMCModem close
to inadequately protected personal medical devices such as hearing aids and
pacemakers. Consult the manufacturers of the medical device to determine if it is
adequately protected.
•Operation of your wireless MMCModem close to other electronic equipment may also
cause interference if the equipment is inadequately protected. Observe any warning
signs and manufacturers’ recommendations.
Safety Standards
THE MMCMODEM COMPLIES WITH ALL APPLICABLE RF SAFETY STANDARDS. This cellular
modem meets the standards and recommendations for the protection of public exposure to RF
electromagnetic energy established by governmental bodies and other qualified organizations, such
as the following:
•Directives of the European Community,
•Directorate General V in Matters of Radio Frequency Electromagnetic Energy

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 7
Instructions to OEMs
The Multi-Tech product manual includes specific warnings and cautions in order to ensure that OEMs
are aware of their responsibilities, with regards to RF exposure compliance, for products into which
the modem is integrated. With this guidance, the OEM will be able to incorporate into their
documentation the necessary operating conditions and warnings.
OEMs need to provide a manual with the ‘’final’’ product that clearly states the operating requirements
and conditions and that these must be observed to ensure compliance with current FCC RF exposure
requirements / MPE limits (see the “RF Exposures” section above). This will enable the OEM to
generate (and provide the end-user with) the appropriate operating instructions, warnings and
cautions, and/or markings for their product.

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 8
Specifications
The MTMMC-G-F4 meets the following specifications:
Category Description
Standards GPRS Class 10
Bandwidth Quad-band 850/900/1800/1900 MHz
Serial/Data Speed Serial interface supports DTE speeds to 115.2K
Packet data up to 85.6K bps
Coding Schemes: CS1 to CS4
Circuit-switched data up to 14.4K bps transparent and non-transparent
Baud rate from 300 to 115,200 bits/s
Data Format Asynchronous, transparent and non-transparent
Data Error Correction MNP2
Data Compression V.42bis
Dimensions 2.5” W x 1.8.” H x 0.48” D (6.4 cm x 4.6 cm x 1.2 cm)
Weight 2.8 oz. (79 g)
Operating Temperature -30° to +70° C
Storage Temperature -40° to +85° C
Humidity 20% to 90% (non-condensing)
Operating Voltage 5 VDC +/- 5% 1A
Power Requirements Typical 400mA
Maximum Peak Current 1.4A
Note: The supply does not have to provide a constant high current but must
accommodate the short current spikes.
Connectors 50-Pin Power Connector
Antenna: MMCX
SIM: Standard 3V SIM receptacle
IP Protocols Supported DNS Resolve, FTP Client, IP, IPCP, LCP, PPP Dial-out, TCP socket, UDP
socket, CHAP, PAP
Telephony Emergency calls
Full Rate, Enhanced Full Rate, Half Rate, and Adaptive Multi-Rate
Dual Tone Multi Frequency Function (DTMF)
GSM Supplementary
Services Call Forwarding
Call Barring
Multiparty
Call Waiting and Call Hold
Calling Line Identification
Advice of Charge
USSD
Closed User Group
Explicit Call Transfer
Certifications &
Approvals Certification
CE Mark
Safety Certifications
UL 60950
cUL 60950
EN 60950
AS/NZS 60950:2000
EMC Approvals
FCC Part 2, 15, 22, 24
EN 55022 and EN 55024
EN301 489-1 and EN301 489-7
Network
PTCRB
Warranty Two years

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 9
Category Description
Features Embedded TCP/IP stack
Short Message Services (SMS) Features: Text and PDU, Point-to-Point MT
& MO, SMS Cell broadcast
AT command compatible
Remote control by AT Commands.
Advanced Management Features: Phonebook management, Fixed dialing
number, Real time clock, Alarm management
Board-to-board or board-to-cable mounting
SIM Toolkit Class 2
SIM, network and service provider locks
UCS2 character set management

Chapter 2 – Mechanical Drawing
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 10
Chapter 2 – Mechanical Drawing
The MMCModem GPRS is encased as shown in the figure below. It includes an RF modem, a 50-pin
connector, a SIM holder, and an RF connector.
MMCModem GPRS Mechanical Dimensions

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 11
Chapter 3 – Electrical Characteristics
Introduction
This chapter describes the electrical characteristics of the various interfaces of the MMCModem.
•Electrical interfaces on the 50-pin general purpose connector (power and data/signaling)
Power Supply Pin and Power Supply Consumption
Serial Link
ON/OFF Interface and Power Off Procedure
Boot
Reset Signal
Flashing LED
General Purpose I/O
Analog-to-Digital Converter
Audio (Microphone Inputs and Speaker Outputs)
SIM Interface
SPI Bus
Keypad Interface

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 12
50-Pin Connector Interface
Pin Numbering – Top View
Pin Numbering – Bottom View

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 13
50-Pin Connector Description
Pin # Name IN/OUT I/O Type Description Comment
1 GND GROUND High current
2 GND GROUND High current
3 +5V Supply High current
4 +5V Supply High current
5 CT109/DCD O CMOS/2X Data Carrier Detect
6 GND GROUND High current
7 GPI04 I/O CMOS/2X General Purpose I/O
8 SPK2N O Analog Speaker 2 negative output
9 CT125/RI O CMOS/2X Ring Indicator
10 SPK2P O Analog Speaker 2 positive output
11 Flashing LED O CMOS/2X Working mode indication LED Driven by modem
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 Analog Microphone 2 negative input
19 ~RST I Reset active low Open Collector
20 MIC1P I Analog Microphone 1 positive input
21 GND I Ground
22 MIC1N I Analog Microphone 1 negative input
23 BOOT I BOOT Open Collector
24 GND GROUND High Current
25 CT103/TX I Transmit Data
26 GPIO0 I/O CMOS/2X General Purpose I/O
27 CT107/DSR O 1X Data Set Ready
28 CT104/RX O 1X Receive Data
29 CT108-2/DTR I Data Terminal Ready
30 CT105/RTS I Request to Send
31 COL3 I/O 1X Keypad column
32 COL4 I/O 1X Keypad column
33 COL1 I/O 1X Keypad column
34 COL2 I/O 1X Keypad 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 SIM card supply 3V mode
6mA max.
48 SIMPRES I SIM card detect Connected to SIM
connector pin 8. Pin 4
of SIM connector must
be pulled down to
GND with 1 K-Ohm*
49 SIMDATA I/O 3X I/O for SIM interface 3V mode
50 No functionality
*See SIM socket diagram in SIM interface section

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 14
50-Pin Operating Conditions
Parameter I/O Type Min Max Condition
Vinput low CMOS -0.5V 0.8V
Vinput high
CMOS 2.1V 3.0V
Serial Inputs 2.1V 5.0V*
Voutput low 1X 0.2V IOL = -1mA
2X 0.2V IOL = -2mA
3X 0.2V IOL = -3mA
Voutput high 1X 2.6V IOH = 1mA
2X 2.6V IOH = 2mA
3X 2.6V IOH = 3mA
*Note: TXD, DTR, RTS serial input signals are 5V tolerant (these signals are the only 5V
tolerant signals)

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 15
Power Supply Pins Electrical Interface
The main power supply is provided through a double connection. These connections are
respectively pins 3 and 4 for the +5V and the pins 1 and 2 for the ground (GND). The pins 6,
21, and 24 are also ground connection in order to produce a proper ground plane.
A 5V +/-5% - 1.3A power is strictly required to supply the modem. However, the power supply
does not have to constantly deliver 1.3A current at 5V.
This power supply is internally regulated to a nominal value VBATT.
Note: TXD, DTR, RTS input signals are 5V tolerant (these signals are the only 5V
tolerant signals)
Power Supply Pin Description
Pin # 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 High Current
21 GND Ground High Current
24 GND Ground High Current
Power Consumption of the Power Supply Electrical Interface
Power Consumption in E-GSM900 & GSM850 @ 25 degrees C – Class 5
Conditions INOM IMAX
+5V During TX bursts @2W 1.2 A 1.3 A
+5V Average @ 2W 250 mA 320 mA
+5V Average @ ).5W 180 mA 200 mA
+5V Average idle mode 15 mA 25 mA
Power Consumption in GSM1800 & 1900 MHz @ 25 degrees C – Class 5
Conditions INOM IMAX
+5V During TX bursts @1W 1.1 A 1.2 A
+5V Average @1W 210 mA 235 mA
+5V Average @ 0.25W 165 mA 185 mA
+5V Average idle mode 15 mA 25 mA
Power Consumption in E-GSM/GPRS 900 MHz & GSM/GRPS 850 MHz Mode – Class 10
Conditions INOM IMAX
+5V During TX bursts @ 2W 1.2 A 1.3 A
+5V Average @ 2W 420 mA 470 mA
+5V Average @ 0.5W 280 mA 320 mA
+5V Average idle mode 15 mA 25 mA
Power Consumption in GSM/GRPS 1800 MHz & GSM/GRPS 1900 MHz – Class 10
Conditions INOM IMAX
+5V During TX bursts @ 1W 1.1 A peak 1.2 A peak
+5V Average @ 1W 350 mA 400 mA
+5V Average @ .25W 180 mA 210 mA
+5V Average idle mode 15 mA 25 mA

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 16
Serial Link Electrical Interface
A serial link interface is available complying with V24 protocol signaling but not with V28
(electrical interface) due to a 2.8 Volts interface. TX, RTS and DTR can be either 5V or 3V.
Data signals are Hi = Mark. Controls signals are Hi = Off.
The signals are Tx data (CT103/TX), Rx data (CT104/RX), Request To Send (CT105/RTS),
Clear To Send (CT106/CTS), Data Terminal Ready (CT108-2/DTR), Data Carrier Detect
(CT109/DCD), Ring Indicator (CT125/RI), and Data Set Ready (CT107/DSR).
Serial Link Pin Description
Signal Pin # 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 send
CT107 / DSR 27 O 1X Data set ready
CT108-2 / DTR 29 I CMOS Data terminal ready
CT109 / DCD 5 O CMOS / 2X Data carrier detect
CT125 / RI 9 O CMOS / 2X Ring indicator
* See “Operating Conditions” in the section on the 50-pin Connector Description.
Level Shifter Application for the Serial Link
Modem TerminalLevel Shifter
Vcc
RI
DCD
RX
CTS
DSR
DTR
TX
RTS
Vcc
28
25
1
3
24
23
22
19
17
16
21
20
18
13
C1+
C1-
C2+
T1IN
T2IN
T3IN
T4IN
T5IN
R1OUTB
R2OUT
R3OUT
R4OUT
ON
C2-
T1OUT
T2OUT
T3OUT
T4OUT
T5OUT
R1IN
R2IN
R3IN
ERROR
OFF
27
2
26
4
5
6
7
10
12
8
9
11
15
14
S_RI
S_DCD
S_RX
S_CTS
S_DSR
S_DTR
S_TX
S_RTS
Vcc
Vcc
GND
Vcc
GND
MAX 3238
*This application noteisvalid for Vcc> 3.0Volt (seeMAX 3238 specifications)
Auto shut down mode is not used in this example.
Level Shifter Application Diagram for Serial Link

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 17
ON / ~OFF Electrical Interface
This input is used to switch the MMCModem ON or OFF. 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 maintained to VCC during a minimum time of 1 second. When powered off, the
shutdown current is roughly 60 microamperes.
ON / OFF Pin Description
Signal Pin # I/O I/O Type Description
ON / ~OFF 15 I CMOS Modem Power ON/OFF
Power OFF Procedure
In order to power OFF the MMCModem, switch it OFF both via software (AT+CPOF; see AT
Command Manual for more details) and via hardware line.
Power-Off Procedure 1
Power-Off Procedure 2

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 18
BOOT Electrical Interface
This input is used to switch the MMCModem into download mode (backup procedure).
The internal boot procedure is started when this pin is low during the power ON of the
modem.
In normal mode, this pin has to be left open.
If used, this input has to be driven by an open collector or an open drain.
Boot Procedure
BOOT : Pin 23
Switch BOOT
If Switch Boot = 1, Boot pin 23 = 0, to download mode
If Switch Boot = 0, Boot pin 23 = 1, to normal mode
Boot Procedure Diagram
BOOT Pin Description
Signal Pin # I/O I/O Type* Description
BOOT 23 I CMOS SW downloading
* See “Operating Conditions” in section on the 50-pin Connector Description.

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 19
Reset Signal (~RST) Electrical Interface
This signal is used to force a reset of the MMCModem. It has to be used by providing low
level during approximately 2ms. This signal has to be considered as an emergency reset
only. A reset procedure is already driven by an internal hardware during the power-up
sequence.
This signal can also be used to provide a reset to an external device. If no external reset is
necessary this input can be left open. If used (emergency reset), it has to be driven by an
open collector or an open drain. See below an example of application diagram.
Reset Signal Pin Reset : Pin 19
Switch Reset
If switch Reset = 1, Reset pin 19 = 0
If switch Reset = 0, Reset pin 19 = 1
Reset Signal Pin Procedure Diagram
Reset Signal Pin Description
Signal Pin # I/O I/O Type* Description
~RST 19 I/O Modem reset
* See “Operating Conditions” in section on the 50-pin Connector Description.
Reset Signal Electrical Characteristics
Parameter Min Max Unit
Input Impedance ( R ) 4.7 kilo-ohms
Input Impedance ( C ) 10 nanofarads
Reset Signal Operating Conditions
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

Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 20
Flashing LED Electrical Interface
The flashing LED signal is used to indicate the working mode of the MMCModem.
Flashing LED Pin Description
Signal Pin # I/O I/O Type* Description
Flashing LED 11 I/O CMOS/2X Working mode indication LED
* See “Operating Conditions” in section on the 50-pin Connector Description.
General Purpose Input/Output Electrical Interface
The MMCModem provides two General Purpose I/O connections. They can be used to
control any external device.
General Purpose I/O Pin Description
Signal Pin # I/O I/O Type* Description Default Value
GPIO0 26 I/O CMOS / 2X General Purpose I/O 0
GPIO4 7 I/O CMOS / 2X General Purpose I/O 0
* See “Operating Conditions” in section on the 50-pin Connector Description.
All digital I/O complies with 3Volts CMOS.
You can access (write or read) the GPIO value via AT+WIOW and AT+WIOR. See AT
Command manual for more details.
Analog to Digital Converter Electrical Interface
The MMCModem has an Analog to Digital converter (ADC) input. This converter is 10 bits,
ranging from 0 to 2.5V. You can see the measurements via AT+ADC. See AT Command
manual for more details.
A/D Converter Pin Description
Signal Pin # I/O I/O Type* Description
AUXV0 17 I Analog A/D converter
* See “Operating Conditions” in section on the 50-pin Connector Description.
A/D Converter Electrical Characteristics
Parameter Min Max Unit
Resolution 10 bits
Sampling Rate 90.3 Ksps
Input Signal Range 0 2.5V Volts
ADC Reference Accuracy 0.5 %
Integral Accuracy +/- 1 LSB
Differential Accuracy +/- 1 LSB
Input Impedance ( R ) 10 meg-Ohms
Input Impedance ( C ) 50 pico-Farads