Multitech MTCMR-H User's Guide download pdf (Page 11)

Chapter 1 – Product Description and Specifications

GPIO (General Purpose Input/Output) 6-Pin Connector

The GPIO pins are configured using Universal IP (UIP) AT Commands. Refer to the Universal IP (UIP) AT Command

Reference Guide on your MultiModem CD. The following table explains the GPIO functions:

Number

Description GPIO 6-Pin

Connector

Pin 1 DIO 0

Pin 2 DIO 1

Pin 3 DIO 2 / ADC 0

Pin 4 DIO 3 / ADC 1

Pin 5 ADC 2

Pin 6 Gnd

The GPIO pins can be configured independent of each other.

● Pin 1 can be configured as either Digital Input (5V tolerant TTL/CMOS levels) or Digital Output (3.3V High)

● Pin 2 can be configured as either Digital Input (5V tolerant TTL/CMOS levels) or Digital Output (3.3V High)

● Pin 3 can be configured as either Digital Input (5V tolerant TTL/CMOS levels) or Digital Output (3.3V High)

or as an ADC input (0 to 3.3V rail)

● Pin 4 can be configured as either Digital Input (5V tolerant TTL/CMOS levels) or Digital Output (3.3V High)

or as an ADC input (0 to 3.3V rail)

● Pin 5 is configured as an ADC input (0 to 3.3V rail)

● Pin 6 is GND and must be connected to the ground of the attached device

GPIO DC Characteristics

Pins 1-5

Paramete

Min Max Units

Input Low-level Voltage -0.3 0.8 V

Input High-level Voltage 2.0 5.5 V

Output Low-level Voltage 0.0 0.4 V

Output High-level Voltage 2.9 3.3 V

Pins 1,2,3,4

Output Current

Paramete

Min Max Units

Output Current 2 mA

Pin 5 is an ADC input only

Pins 1-5 contain ESD protection

AT Command Information

AT commands for the MultiModem iCells are published in separate Reference Guides included on the MultiModem

CD and posted on the Multi-Tech web site.

Multi-Tech Systems, Inc. MultiModem iCell Intelligent Wireless Modem User Guide 11

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Multitech MTCMR-H User's Guide Page 11