LISA-U1 series - System Integration Manual
3G.G2-HW-10002-3
Preliminary
System description
Page 80 of 125
Name
Description
Remarks
GPIO1
GPIO
By default, the pin is configured as Pad disabled.
Can be alternatively configured by the AT+UGPIOC command as
Output
Input
Network Status Indication
GPS Supply Enable
GSM Tx Burst Indication
GPIO2
GPIO
By default, the pin is configured to provide the GPS Supply Enable function.
Can be alternatively configured by the AT+UGPIOC command as
Output
Input
Network Status Indication
Pad disabled
GPIO3
GPIO
By default, the pin is configured as Pad disabled.
Can be alternatively configured by the AT+UGPIOC command as
Output
Input
Network Status Indication
GPS Supply Enable
GPIO4
GPIO
By default, the pin is configured as Pad disabled.
Can be alternatively configured by the AT+UGPIOC command as
Output
Input
Network Status Indication
GPS Supply Enable
GPIO5
GPIO
By default, the pin is configured to provide the SIM card detection function.
Can be alternatively configured by the AT+UGPIOC command as
Output
Input
Network Status Indication
GPS Supply Enable
Pad disabled
Table 33: GPIO pins
The GPIO pins ESD sensitivity rating is 1 kV (Human Body Model according to JESD22-A114F). Higher
protection level could be required if the lines are externally accessible on the application board. Higher
protection level can be achieved by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor
array) on the lines connected to these pins.
An application circuit for a typical GPIOs usage is described in Figure 43:
Network indication function provided by the
GPIO1
pin
GPS supply enable function provided by the
GPIO2
pin
GPS data ready function provided by the
GPIO3
pin (function supported by upcoming FW version)
GPS RTC sharing function provided by the
GPIO4
pin (function supported by upcoming FW version)
SIM card detection function provided by the
GPIO5
pin
Use transistors with at least an integrated resistor in the base pin or otherwise put a 10 k
Ω
resistor on
the board in series to the GPIO.
If the GPIO pins are not used, they can be left unconnected on the application board.
