nRF9161 DK v0.9.1

Buttons and LEDs

The nRF9161 DK has four LEDs and four buttons for user interaction. By default, they are connected to the nRF9161 General-Purpose Input/Output (GPIO)s as shown in the following table.

Table 1. Button and LED connection
LED 1 P0.00
LED 2 P0.01
LED 3 P0.04
LED 4 P0.05
Button 1 P0.08
Button 2 P0.09
Button 3 P0.18/AIN5
Button 4 P0.19/AIN6

To change default nRF9161 GPIO connections, see Board control

Any LED or button can optionally be routed to an I/O expander. For more information, see I/O expander.

The buttons are active low, meaning that the input is connected to ground when the buttons are pushed. They have no external pull-up resistor, and therefore the P0.08, P0.09, P0.18, and P0.19 pins must be configured as an input with an internal pull-up resistor.

The LEDs are active high, meaning that writing a logical one (1) to the output pin illuminates the LED. The nRF9161 GPIOs control power transistors, and the LEDs are fed from a separate 3.0 V domain. Therefore, LED current is not drawn from nRF9161 GPIOs or the nRF9161 supply.

The following figures show the buttons and LEDs

Figure 1. Buttons
Figure 2. LEDs