User guide

LEDS, CONNECTORS, AND SPECIFICATIONS
■ Configure Pin 4 as either Digital Input (5V tolerant TTL/CMOS levels), Digital Output (3.3V High) or as an ADC
input (0 to 3.3V rail)
■ Pin 5, 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 contain ESD protection.
Pins 1, 2 Input Voltage
Parameter Min Max Units
Input Low-level Voltage 0.3 1.0 V
Input High-level Voltage 3.0 24 V
Pins 1,2 are digital input only.
Pins 3,4 Input Voltage
Parameter Min Max Units
Input Low-level Voltage -0.3 0.8 V
Input High-level Voltage 2.0 5.5 V
Pins 3,4 Output Voltage
Parameter Min Max Units
Output Low-level Voltage 0.0 0.4 V
Output High-level Voltage 2.9 3.3 V
Pins 3,4 Output Current
Parameter Min Max Units
Output Current - 2 mA
RS-232 9-Pin Female Connector
Pin Abbre Description In/Out
viatio
n
1 CD Carrier Detect O
2 RX Receive O
36 MultiModem
®
iCell MTCMR User Guide