Multitech MMCModem MTMMC-G-F4, Developer'S Manual

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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