Buttons - Ublox BMD-38 EVK User Manual

BMD-34 / 38 EVK - User guide
When the reset button is directly connected to P0.18, it can be used as a fifth user button or
as a reset button directly connected to the BMD-34 module.
Solder jumper J18 is used to connect P0.18 of the BMD-34 module to the RESET_N net (noted
as nRESET in Figure 4 below). RESET_N is connected to the interface IC and to the reset
connections on the Arduino headers.
Figure 4: Schematic – Reset

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
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