Ublox LISA-U100, Integration Manual

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LISA-U series - System Integration Manual
UBX-13001118 - R17 Advance information System description
Page 113 of 190
Pin Module Name Description Remarks
56 LISA-U2 series 13 SPI_MOSI /
GPIO11
SPI Data Line /
GPIO
By default, the pin is configured as SPI Data Line Input:

Shift data on rising clock edge (CPHA=1)

Latch data on falling clock edge (CPHA=1)

Idle high

Internal active pull-up to V_INT enabled
Can be alternatively configured by the +UGPIOC command as

Output

Input

Pad disabled
57 LISA-U2 series 13 SPI_MISO /
GPIO12 SPI Data Line Output /
GPIO By default, the pin is configured as SPI Data Line Output:

Shift data on rising clock edge (CPHA=1)

Latch data on falling clock edge (CPHA=1)

Idle high
Can be alternatively configured by the +UGPIOC command as

Output

Input

Pad disabled
58 LISA-U2 series 13 SPI_SRDY /
GPIO13
SPI Slave Ready /
GPIO
By default, the pin is configured as SPI Slave Ready Output:

Idle low
Can be alternatively configured by the +UGPIOC command as

Output

Input

Module Status Indication

Pad disabled
59 LISA-U2 series
13 SPI_MRDY /
GPIO14
SPI Master Ready /
GPIO By default, the pin is configured as SPI Master Ready Input:

Idle low

Internal active pull-down to GND enabled
Can be alternatively configured by the +UGPIOC command as

Output

Input

Module Operating Mode Indication

Pad disabled
Table 48: 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, close to accessible points.
An application circuit for a typical GPIOs usage is described in Figure 59:

Network indication function provided by the GPIO1 pin

GNSS supply enable function provided by the
GPIO2
pin (not supported by LISA-U200-00S)

GNSS data ready function provided by the
GPIO3
pin (not supported by LISA-U200-00S)

GNSS RTC sharing function provided by the GPIO4 pin (not supported by LISA-U200-00S)

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.
Any external signal connected to GPIOs must be tri-stated when the module is in power-down mode,
when the external reset is forced low and during the module power-on sequence (at least for 3 s after the