4.4 Battery Powered Board

The ATmega324PB Xplained Pro can be powered from an external battery connected directly to the target. To do this the on-board programmer/debugger has to be disconnected.

The following procedure should be followed:

  1. Remove all resistors connecting the EDBG to the target. They can be found on the backside nicely aligned and ready to be removed.
  2. Remove R105 to disconnect the target from the on board power supply.
  3. Attach an external battery to the Power header (J101). GND to J101.2 and VCC to J101.4 (usually the RED wire).
    Tip: An external debugger/programmer can be connected to the ATmega324PB JTAG header.
    Tip: To save battery power during debugging it is possible to connect a wire from the 3.3V test point (J100) to the power header J101.4, using the USB power to supply the target.
Figure 4-2.  ATmega324PB Xplained Pro Connector Overview