
Chapter 3 – Electrical Characteristics
Wireless ModemModule MTMMC-G-F1 and MTMMC-G-F2 Developer’s Guide
24
General Purpose Input/Output
The ModemModule provides two General Purpose I/O connections. They can be used to control any external
device.
Table 3-16 : General Purpose I/O Pin Description
Signal
Pin Number
I/O
I/O Type*
Description
Default Value
GPIO0
26
I/O
CMOS / 2X
General Purpose I/O
0
GPIO4
7
I/O
CMOS / 2X
General Purpose I/O
0
* See “Table 3-2: 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
The ModemModule has an Analog to Digital converter (ADC) input. This converter is a 10 bits one, ranging from
0 to 2.5V. You can see the measurements via AT+ADC. See AT Command manual for more details.
Table 3-17: A/D Converter Pin Description
Signal
Pin Number
I/O
I/O Type*
Description
AUXV0
17
I
Analog
A/D converter
* See “Table 3-2: Operating Conditions” in section on the 50-pin Connector Description.
Table 3-18: A/D Converter Electrical Characteristics
Parameter
Min
Max
Unit
Resolution
10
bits
Sampling Rate
90.3
Ksps
Input Signal Range
0
2.5V
Volts
ADC Reference Accuracy
0.5
%
Integral Accuracy
+/- 1
LSB
Differential Accuracy
+/- 1
LSB
Input Impedance ( R )
10
mega-
Ohms
Input Impedance ( C )
50
pico-
Farads