Multi-Tech Systems 92U03G23720 User Manual

Chapter 3 – Electrical Characteristics

Wireless ModemModule MTMMC-G-F1 and MTMMC-G-F2 Developer’s Guide

    

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

Pull up with
100K-ohm
when not used

30

CT105/RTS

I

Request to Send

Pull up with
100K-ohm
when not used

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

GPO0

General purpose I/O

* See SIM socket diagram in SIM interface section

** GPO0 is a general purpose output for selection of external SIM, 3V or 5V.