nRF52832 module dead once being mounted on custom PCB

RE: nRF52832 module dead once being mounted on custom PCB

ketiljo — Wed, 16 Mar 2022 11:46:09 GMT

If you tested with the DCDC enabled before you mounted the module and the DCDC inductor was missing or not correct, this will happen as the DCDC can't supply the device if it's not working. If the DCDC wasn't enabled, it should work with the internal LDO.

RE: nRF52832 module dead once being mounted on custom PCB

Avadacadabara — Wed, 16 Mar 2022 07:42:13 GMT

Solved, we mounted inductors to enable the DCDC and it can be detected by JLINK.

But only this module has such restriction.

RE: nRF52832 module dead once being mounted on custom PCB

Avadacadabara — Tue, 15 Mar 2022 01:32:53 GMT

Vcc of all modules are connected to the same bus, but only this module fails to work. We did measure supply pins(those "TXDB" pads) but no short detected. Do we have to test other Vcc that haven't been lead out from module since they might have different behavior?

C23,C24 are 100nF based on reference circuit but we left the L5,6,11,12 empty. DEC4 cap seems already integrated in module but not quite sure the value. Do I need to adjust cap on DEC1 and DEC4 if we don't intend to turn on DCDC converter?

We tried to left the whole PCB empty and solder only this module and its peripherals, it's still dead...

Thanks

RE: nRF52832 module dead once being mounted on custom PCB

ketiljo — Mon, 14 Mar 2022 15:44:24 GMT

I'd suspect a short somewhere. Have you measured all supply voltage pins? If your DEC1 pin is same as the DEC4 pin on the nRF52832, the caps to ground, C23 and C24, mist be 1 µF each for the DCDC converter to work.