User's Manual

LE940B6 Hardware User Guide
1VV0301331 Rev. 1.8 - 2017-03-15
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PAD Signal I/O Function Type Drive Strength
R18 GPIO_07 I/O Configurable GPIO CMOS 1.8V 3 mA
S19 GPIO_08 I/O Configurable GPIO CMOS 1.8V 3 mA
U19 GPIO_09 I/O Configurable GPIO CMOS 1.8V 3 mA
W19 GPIO_10 I/O Configurable GPIO CMOS 1.8V 3 mA
L18 GPIO_11 I/O Configurable GPIO CMOS 1.8V 3 mA
J18 GPIO_12 I/O Configurable GPIO CMOS 1.8V 3 mA
AN4 GPIO_20 I/O Configurable GPIO CMOS 1.8V 3 mA
H1 GPIO_21 I/O Configurable GPIO CMOS 1.8V 3 mA
K1 GPIO_22 I/O Configurable GPIO CMOS 1.8V 4 mA
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 8.3.2, 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.