Buttons; Leds - Ublox BMD-34 EVK Series User Manual

BMD-34 EVK - User guide

2.3 Buttons

The evaluation board has four user buttons: Button 1, Button 2, Button 3, and Button 4. All
buttons are active low; they will connect to ground when pressed. The button GPIO pins must
be configured with internal pull-up resistors for proper operation when using the user buttons.
The buttons and ESD protection can be completely removed from the circuit by breaking the
associated jumper.
Figure 5: Schematic – User buttons

2.4 LEDs

User LEDs are provided on the evaluation board - two red and two green. An RGB LED is
included as well and can be enabled by changing the position of JLED. LEDs are powered by
VIO and are active low. The GPIO should be enabled for high drive when sinking current for the
LEDs. The LEDs can be completely removed from the circuit by breaking the associated
jumper.
Figure 6: Schematic – User LEDs
UBX-19033356 - R03 Hardware description Page 9 of 20