nrf52833 standby current reaches 60uA

First, NRF52833 work environment at 100 degrees celsius, standby current reaches 60uA.

Second, When the NRF52833 working in 100 degrees Celsius, what kind of processing software or hardware needs to be done.

Third, When the NRF52833 dormant, how to shielding the red signal in the frame? As is shown.

  • I try to increase the capacitance value, but has no effect on refresh rate and.

    Refresh rate should only be affected by the MCU internal capacitance?

    Under the environment of 100 degrees Celsius, standby power consumption is short of 15 ua manual, actual it is around 60 ua.

  • Did you increase C6? C6 should affect the refresh rate.

    .. and did you test this:

    "the internal leakage of the nRF52833 rises with temperature, and there is no control over this but it can be measured by testing an isolated part, crudely put swiftly heat the package of the nRF52833 alone to 100 degrees while not heating the rest of the board and components"

  • Sorry, I don't have such test equipment, can you help provide this data?

    I modified the C5 and C6 respectively, but the refresh rate remains unchanged.

  • Differences between the MCU version produced?I'm using the MCU of screen printing is N52833-QDAAA0-2117FX.

  • If changing C6 doesn't affect the frequency then we must assume the nRF52833 uses a hysteretic controller with a fixed frequency and periodic charge time fixed by Vnom+-Vhyst. This fixed frequency is presumably some RC-oscillator, the details of which we do not know. The likely cause is then the RC components which are used to determine that frequency, however the very wide range reported seems improbable.

    It is not clear what other components are on the board, or what power supply is used. Does the battery voltage vary with temperature? Testing a bare nRF52833 with no other components other than the required regulator C and R is probably the best step; preferably on a board where all other components are removed. Nordic could probably do this test but maybe you could test with your board. I only help out from time to time, if I get time I will try a local heat test but can't give a timescale.

    Also internal leakage affects the 1.3 volt internal rail, whereas external components load Vdd; we don't know what effect that has on the hysteretic frequency.

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