I am trying to build a battery-powered application using the Feather 32u4. I need a timer to trigger every 120 seconds (although Timer1 with it's 8 second limit would suffice for the beginning), thus I tried using IDLE_MODE, which should save some power. Connecting the battery's 3V to the feather's 3V pin resulted in about 9mA power draw though, which is way to much.

Considering that the promised 0.3mA current in IDLE_MODE is still too much, what other options do I have to have a 120sec timer with ultra low sleep consumption?

  • \$\begingroup\$ The datasheet promises consumption of 0.3mA and you want it lower. Is there something I'm missing, or have you clearly, by your own definition, bought the wrong part? \$\endgroup\$
    – enhzflep
    Mar 4, 2021 at 10:53
  • 1
    \$\begingroup\$ An MSP430. It'll sleep at well under 1 uA with the timer clock running, and wake up on a timer. Smallest ones are SO-8 and MCU + crystal should be about $1. \$\endgroup\$ Mar 4, 2021 at 12:38
  • \$\begingroup\$ @enhzflep Could you please hint me at where the datasheet states that? I was not able to find it in the datasheet itself... \$\endgroup\$
    – Daniel D.
    Mar 7, 2021 at 0:16


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