What is the uA/MHz of the ATSAMD51J19A?

[syedkarim]

What is the power consumption of the MCU when operating at ridiculously slow speeds?

What is the power consumption during sleep/hibernate modes?

[maholli]

Currently: running CircuitPython it's about 12mA average. There are hacks to clock CircuitPython way down, but I haven't had enough time to get that ready for the general public (at the moment it breaks certain stuff).

CircuitPython has sleep/deep-sleep modes but functionality hasn't be ported to the SAMD51 yet. I have an open issue trying to motivate folks to implement it: circuitpython/#4837. I wish I had the time to do it myself but it'd just take me too long atm. I'm thinking it's time to fund a bounty 😂

[maholli]

Ok I went ahead and implemented bare-bones SAMD deep sleep in circuitpython. PyCubed power consumption under various conditions are discussed in my write-up here.

I haven't merged my dynamic clock speed for the CPU into CircuitPython main (yet), but to answer your question about sleep modes:

1. everything off + deep sleep: ~4 to 8mW (<1mA at 8V from Vbatt)
   On the board I measured it's closer to 5mW
   This can be further reduced by hardware tweaking (as discussed in link above)