LE940B6 HW User Guide
Rev. 2.02
Page 84 of 111
2020-01-10
NOTE:
To avoid a back-powering effect, it is recommended to avoid having any
HIGH logic level signal applied to the digital pins of the module when it is
powered OFF or during an ON/OFF transition.
NOTE:
LE940B6 GPIOs can also be used as alternate I2C function. Refer to Section
I2C - Inter-integrated Circuit
8.6.1.
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.
8.6.2.
Using a GPIO Pad as Output
GPIO pads, when used as outputs, can drive 1.8V CMOS digital devices or compatible
hardware. When set as outputs, the pads have a push-pull output, and therefore the pull-
up resistor can be omitted.
Figure 22: GPIO Output Pad Equivalent Circuit
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