Multi-Tech Systems 92U03G23720 ユーザーズマニュアル

Chapter 3 – Electrical Characteristics

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

    

GND

SIMVCC

IK

1

SIMRST

SIMCLK

SIMDATA

SIMPRES1 8

7

3

2

VCC

RST
CLK

CC4
GND

VPP

I/O
CC8

The SPI bus includes a CLK signal, an I/O signal and an EN signal complying with SPI bus standard. The
maximum speed transfer is 3.25Mb/s.

SPI_CLK

44

O

1X

SPI Serial Clock

SPI_IO

43

I/O

CMOS/1X

SPI Data

SPI_EO

42

O

1X

SPI Enable

* See “Table 3-2: Operating Conditions” in section on the 50-pin Connector Description.

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.

ROW0

39

I/O

CMOS / 1X

Row scan

ROW1

40

I/O

CMOS / 1X

Row scan

ROW2

37

I/O

CMOS / 1X

Row scan

ROW3

38

I/O

CMOS / 1X

Row scan

ROW4

35

I/O

CMOS / 1X

Row scan

COL0

36

I/O

CMOS / 1X

Column scan

COL1

33

I/O

CMOS / 1X

Column scan

COL2

34

I/O

CMOS / 1X

Column scan

COL3

31

I/O

CMOS / 1X

Column scan

COL4

32

I/O

CMOS / 1X

Column scan

* See “Table 3-2: Operating Conditions” in section on the 50-pin Connector Description.