User's Manual

Chapter 3 – Electrical Characteristics
Wireless ModemModule MTMMC-C Developer's Guide 8
Chapter 3 – Electrical Characteristics
Introduction
This chapter describes the ModemModule’s electrical interfaces. These are:
· 50-pin connector (power and data/signaling)
· RF interface
50-Pin Connector Interfaces
Pin # Name I/O 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 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 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 Pull up with
100K-ohm
when not used
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