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unable to program when powered with coin cell

consulting99

I am using my custom board , it is usually powered with a dc supply and I can program it easily. My chip is NRF52811. 

When powered with a Cr2032 the segger studio says id code not detected.

Is there any documented minimum requirement for input supply during programming ? 

Voltage measured at coin cell terminal 'when connected ' was 3.0+ volts, it is a new cell.

  • +1

    Measure again when programming.

    If a CR2032 is not absolutely fresh from the package, it usually drops too much down when programming via SWD.

    Input currrent is a few mA, since programming/debugging disables sleep. That is close to short circuit current on a CR2032.

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