WA_DEV_W218_PTS_002 Rev 005 Page 47 of 109
Product Technical Specification &
Customer Design Guidelines
General Purpose Input/Output
The WISMO218 provides up to 3 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
Table 13. GPIO Pin Descriptions
Signa l
Pin N umber
I/O
I/O Type
Reset Stat e
GPIO1
24
I/O
2V8
Pull up
GPIO3
16
I/O
2V8
Pull up
GPIO5
19
I/O
2V8
Pull down
GPIO2 is dedicated for WISMO_READY and is not open as GPIO purpose for customer use.
GPIO4 is dedicated for TX burst indication and is not open as GPIO purpose for customer use.
When GPIO5 is used as a general purpose output, it is n ecessary to have an external pull up resistor connecting to a 2.8V
source. Resistance value depends on the current drain required b y the application side.