User's Manual

LISA-U1/LISA-H1 series - System Integration Manual
3G.G2-HW-10002-2 Advance Information System description
Page 75 of 116
Name
Description
Remarks
GPIO1
GPIO
By default, any function is disabled and the internal active pull-down is enabled.
Can be alternatively configured by the AT+UGPIOC command
 to provide the Output function
 to provide the Input function
 to provide the Network Status Indication function
 to provide the GPS Supply Enable function
 to provide the GSM Tx Burst Indication function
GPIO2
GPIO
By default, the pin is configured to provide the GPS Supply Enable function.
Can be alternatively configured by the AT+UGPIOC command
 to provide the Output function
 to provide the Input function
 to provide the Network Status Indication function
 to disable any function and enable the internal active pull-down
GPIO3
GPIO
By default, the pin is configured to provide the GPS Data Ready function.
Can be alternatively configured by the AT+UGPIOC command
 to provide the Output function
 to provide the Input function
 to provide the Network Status Indication function
 to provide the GPS Supply Enable function
 to disable any function and enable the internal active pull-down
GPIO4
GPIO
By default, the pin is configured to provide the GPS Aiding Synch function.
Can be alternatively configured by the AT+UGPIOC command
 to provide the Output function
 to provide the Input function
 to provide the Network Status Indication function
 to provide the GPS Supply Enable function
 to disable any function and enable the internal active pull-down
GPIO5
GPIO
By default, the pin is configured to provide the SIM card detection function.
Can be alternatively configured by the AT+UGPIOC command
 to provide the Output function
 to provide the Input function
 to provide the Network Status Indication function
 to provide the GPS Supply Enable function
 to disable any function and enable the internal active pull-down
Table 32: GPIO pins
The GPIO pins ESD rating is 1 kV (contact discharge). A higher protection level could be required if the
lines are externally accessible on the application board. A higher protection level can be achieved
mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor array) on the lines connected to
these pins.
An application circuit for a typical GPIO usage (GPS supply enable, GPS aiding synch, GPS data ready, SIM card
detection, Network indication) is described in Figure 43.
Use transistors with at least an integrated resistor in the base pin or otherwise put a 10 kΩ resistor on
the board in series to the GPIO.