Table of Contents
Advertisement
Flashing LED Electrical Interface
The flashing LED signal is used to indicate the working mode of the MMCModem.
Flashing LED Pin Description
Signal
Flashing 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
GPIO0
GPIO4
* 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
AUXV0
* See "Operating Conditions" in section on the 50-pin Connector Description.
A/D Converter Electrical Characteristics
Parameter
Resolution
Sampling Rate
Input Signal Range
ADC Reference Accuracy
Integral Accuracy
Differential Accuracy
Input Impedance ( R )
Input Impedance ( C )
Multi-Tech Systems, Inc. MMCModem GPRS Developer's Guide (S000445D)
Pin #
I/O
I/O Type*
11
I/O
CMOS/2X
Pin #
I/O
I/O Type*
26
I/O
CMOS / 2X
7
I/O
CMOS / 2X
Pin #
I/O
I/O Type*
17
I
Analog
Min
10
90.3
0
0.5
+/- 1
+/- 1
10
Chapter 3 – Electrical Characteristics
Description
Working mode indication LED
Description
General Purpose I/O
General Purpose I/O
Description
A/D converter
Max
Unit
bits
Ksps
2.5V
Volts
%
LSB
LSB
meg-Ohms
50
pico-Farads
Default Value
0
0
20
Advertisement
Table of Contents
