I am working on a battery operated device, and I want it to be able to last as long as possible. I am putting the MCU into idle, but it is still taking way more power than I would want it to. I would love to be able to put it into full-fledged sleep mode, but it cant wake itself up again without an external interrupt.
Is there an IC I can use that pulses once a second or once every few seconds, but doesn't need many external components and takes very little power? I would like to use that to trigger an interrupt. Thanks.