nRF9161 DK v0.9.1

I/O expander

The nRF9161 DK has an I/O expander that can optionally be used to interface the LEDs and buttons.

Table 1. I/O expander interface
Signal GPIO Description
SDA P0.30 I2C data line
SCL P0.31 I2C clock line
IOEXP_IRQ P0.19 Interrupt line from the I/O expander
The following table shows the I/O expander connections.
Table 2. I/O expander connections
Component I/O expander pin
LED 1 I/O_EXP_IO4
LED 2 I/O_EXP_IO5
LED 3 I/O_EXP_IO6
LED 4 I/O_EXP_IO7
Button 1 I/O_EXP_IO0
Button 2 I/O_EXP_IO1
Button 3 I/O_EXP_IO2
Button 4 I/O_EXP_IO3
The following figure shows the I/O expander connections.
Figure 1. I/O expander
I/O expander