nrf52832 POR

[lhsj81]

Hi,

Would I be able to get more information on the statement below from the nrf52832 datasheet? "A step increase in supply voltage of 300 mV or more, with rise time of 300 ms or less, within the valid supply range, may result in a system reset."

Any timing conditions, e.g. how long the VDD has to be in x V, prior to the step response and the RC time constant of the POR circuit (with tolerance) would be very helpful!

Thanks, Best regards, Louis

[Øyvind Karlsen]

Hi,

The sentence means that you may trigger a Power on Reset (POR) when you have a short spike in supply voltage. This means the nRF52 chip should be supplied by a stable power source, eg. a battery that can deliver enough current. If you have several chips on your PCB make sure to supply power individually, rather than one after the other.

Best regards,

Øyvind

[peter]

Hi!

I have a question related to this: e.g. if I have a supply voltage that may vary, e.g. having 2-3 volts during sleep, then when the CPU wakes up, it will enable a boost converter that lifts the voltage to 3.3 volts to match the logic level of external digital ICs. Then after it's done communicating with those ICs, it will switch the boost converter off and run on 2-3 V again. Would this scenario also potentially trigger that behavior, or is it more safe than having short-lived spikes in the supply voltage?

Thanks, Peter