Impact of immediate power cut off to nrf5340-QKAA

[EstherL]

What is the impact of the power cut off immediately to the chip during boot up or update firmware?

1. Will the power drop immediately to ground? 

2. Does the power cut off immediately have risk of firmware corruption?

3. Any proven method or countermeasure to prevent chip to corrupt? What is the recovery method if chip corrupted?

4. What is the delay time required before system completely cut off?

[Priyanka]

Hi Esther,

1. Will the power drop immediately to ground? 

This will depend on your power supply circuit in the system, because the Nordic chips don't directly control the power supply. 

2. Does the power cut off immediately have risk of firmware corruption?

Yes, that could be a possible scenario. And then you might need to erase and re-flash in case of firmware corruption.

3. Any proven method or countermeasure to prevent chip to corrupt? What is the recovery method if chip corrupted?

You could try to ensure that the power supply is not interrupted during critical operations like boot up or firmware update. Recovery, as mentioned earlier, would be to erase and re-flash the firmware. Another method would also be with the help of bootloader. Please take a look at this.

4. What is the delay time required before system completely cut off?

That would again, as mentioned earlier, depend on the power supply circuit, it's discharge characteristics etc. Please also take a look at the System OFF mode.

Regards,

Priyanka