Not the OP, but my understanding (admittedly a few years outdated) is that an MSP430 will, in idle, with sleep states properly set up and low power modes in use, drain a coin cell battery (e.g. CR2032) over a period of years - with the current drawn around 1.5 uA in standby and 0.1uA in RAM retention idle.
That is likely even lower than the effective self discharge rate of a lithium coin cell battery. I don't believe the Arm equivalents like the Cortex M0 can deliver such low absolute current - maybe microamps, but more than an MSP430 from what I can see.
> That is likely even lower than the effective self discharge rate of a lithium coin cell battery.
That's what I've found too. Based on my measurements and calculations, Photon uses 5µA (MSP430 + motion sensor) while sleeping, while the battery's self-discharge is more like 80µA.
That's probably a good argument for using a more powerful chip though, if the battery self-discharge is that high, hah.
If that's the self discharge rate then the battery would be fully discharged after less than a year on the shelf (given its 190mAh capacity). Coin cells typically have a much longer shelf life than that. I wonder what that figure is, exactly.
That is likely even lower than the effective self discharge rate of a lithium coin cell battery. I don't believe the Arm equivalents like the Cortex M0 can deliver such low absolute current - maybe microamps, but more than an MSP430 from what I can see.
Ref - https://metebalci.com/blog/measuring-the-power-consumption-o...