We are using the 32a4u in a new project. We noticed that the board uses 26mA. Using the JTAG ICE, we can see that this is made up of:
- 6mA for the analog circuitry (when Xmega is in reset or erased mode)
- 9mA for the DAC
- 11mA when running at 16MHz
We used the PLLDIV bit to drop the frequency to 8MHz and it noiw draws 23mA which is better.
The question is why does the DAC draw so much current and is there anyway to reduce this. We have turned on the Low power bit for the DAC but this only dropped the current drain by 0.3mA. The PRP power reduction registers make minimal difference to the current drain.