User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 85 of 124 2019-07-15
PAD
Signal
I/O
Initial Function
Alternate
Function
Type
Drive
Strength
Note
E15
GPIO_36
I/O
SPI_MISO
Configurable
GPIO
CMOS
1.8V
2-16 mA
D15
GPIO_37
I/O
SPI_MOSI
Configurable
GPIO
CMOS
1.8V
2-16 mA
H14
GPIO_11
I/O
SPI_CS
Configurable
GPIO
CMOS
1.8V
2-16 mA
WARNING:
GPIO’s marked with (*) should not be pulled high externally (by the carrier
board) during module power on procedure. Pulling those pads high during
module power up might lead to unwanted/non-operational boot mode.
NOTE:
LE910Cx GPIOs 1~10 can also be used as alternate I2C function. Refer to
Section 8.5.2, I2C - Inter-integrated Circuit.
8.7.1. Using a GPIO Pad as Input
GPIO pads, when used as inputs, can be connected to a digital output of another device
and report its status, provided this device has interface levels compatible with the 1.8V
CMOS levels of the GPIO.
If the digital output of the device is connected with the GPIO input, the pad has interface
levels different from the 1.8V CMOS. It can be buffered with an open collector transistor
with a 10 kΩ pull-up resistor to 1.8V.
8.7.2. Using a GPIO Pad as an interrupt / Wakeup source
GPIO pads that are used as input can also be used as an interrupt source for the
software. In general, all GPIO pads can be also used as interrupts. However, not all
GPIO’s can be used as a wakeup source of the module (wakeup from sleep).
Only the following GPIO’s can be used for waking up the system from sleep:
• GPIO1
• GPIO4
• GPIO5
• GPIO8