sparkfun DEV-16885 Quick Start Manual page 6

SWD Programming Pins
For advanced users, we broke out the SWD programming pins. Note that this is not populated so you will need a
compatible header and compatible JTAG programmer to connect.
Jumper Pads
There are a few jumpers populated on the board:
Bypass (BYP) - By default, the BYP is left open. Adding a solder jumper bypasses the 2A resettable fuse
on the back of the board should you decide to pull more than 2A from your USB source. Proceed with
caution should you decide to bypass the jumper.
Enable (EN) - By default, the EN pin is closed. This jumper is connected to a processor board's GPIO pin.
The processor board cna control the ATP's voltage regulator. Depending on the processor, this may not be
connected.
Current Measurement (MEAS) - By default, the MEAs is closed. Cutting the jumper and soldering to the
PTH pads will allow you to insert a current meter and precisely monitor the how much current your
application is consuming.
3V3 LED - By default, the 3V3 LED is closed. Cutting this jumper will disable the LED there is 3.3V.
VIN LED - By default, the VIN LED is closed. Cutting this jumper will disable the LED whenever there is an
input voltage.