User's Manual

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