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General Purpose Input/Output
The WISMO228 provides up to three General Purpose I/Os. They are used to control any external
device such as an LCD or a Keyboard backlight.
These GPIOs offer the possibility to read the pin state whatever their direction may be.
Pin Description
The following table provides the pin description of the GPIOs.
Pin #
Signal
16
GPIO3
19
GPIO5
24
GPIO1
When GPIO5 is used as a general purpose output, it is necessary to have an external pull up resistor
connected to a 2.8V source. The resistance value will depend on the current drain required by the
application.
Note:
GPIO2 is dedicated for WISMO_READY and is not open as GPIO for customer use.
GPIO4 is dedicated for TX burst indication and is not open as GPIO for customer use.
WA_DEV_W228_PTS_002
Table 15. GPIO Pin Descriptions
I/O
I/O Type
I/O
2V8
Pull up
I/O
2V8
Pull down
I/O
2V8
Pull up
Rev 001
Product Technical Specification &
Customer Design Guidelines
Reset State
Page 52 of 108
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