CC864-DUAL Hardware User Guide
1vv0300791 Rev 4.4 – 2011-01-26
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved.
Page 52 of 63
Pin
Signal
I/O
Function
Type
Input /
output
current
Default
State
ON_OFF
state
State
during
Reset
Alternate Function
64
TGPIO_22 I/O Configurable GPIO
CMOS
1.8V
Input
Low
Warning:
TGPIO_22 has 1.8V CMOS level tolerance to be compatible with the Telit
Unified Form Factor.
3.13.1.
Using a GPIO pin as Input
The GPIO pins, when used as input, can be connected to the digital output of another
device to report its status, provided this device has interface levels compatible with
the 2.6V CMOS levels of the GPIO.
3.13.2.
Using a GPIO pin as Output
The GPIO pins, when used as outputs, can drive 2.6V CMOS digital devices or
compatible hardware.
When set as outputs, the pins have a push-pull output and therefore the pull-up
resistor can be omitted.
3.13.3. TGPIO_06/ALARM
This pin, when configured as alarm output, is controlled by the CC864-DUAL.
It goes high when the alarm starts, and low again after receiving an alarm control AT-
command.
This output may be used to power up the module itself or the external application at
the alarm time, providing the option to program a timely system wake-up to perform
periodic actions while completely turning off either the application or the module
during sleep periods, considerably reducing power consumption.
Refer to SW User Guide or AT Commands Reference Guide for the full description of
this function.
NOTE:
During RESET this pin is at a HIGH logic level.
3.13.4. TGPIO_07/BUZZER
This pin, when configured as buzzer output, is controlled by the module.
It drives a buzzer with square waves, and permits the application to easily implement
the buzzer feature with tones (incoming call, SMS, etc.), or simply playing a tone or
melody when required by the application.
