RE: nrf52832 device DEC1 pin is not in 0.9v range, but at 0.73v

Goale Jian — Tue, 15 Jan 2019 07:20:52 GMT

Hi Håkon, thanks for your infomation.

I just replaced these boards with new parts and the issue is fixed. I guess the issue is due to broken parts or bad soldering.

Regards,

Goale

RE: nrf52832 device DEC1 pin is not in 0.9v range, but at 0.73v

Håkon Alseth — Thu, 03 Jan 2019 11:54:28 GMT

Hi,

This is the digital power supply for the nRF52832, and is nom. 0.9V (can be higher in run mode), but if it is in ULP (ultra low power) mode, it will be duty cycled by the "refresh mode" in hardware. In the latter mode, the voltage is lower than in run mode.

Note that the softdevice only starts up the external 32M HFCLK if it is required (by the radio), and for power optimizing reasons; its turned off afterwards.

Do you have a 32kHz external LFCLK? If not, you have to set the LFCLK source to 32k RC oscillator in your sdk_config (define NRF_SDH_CLOCK_LF_SRC). See for instance this thread on how to configure the RC oscillator: https://devzone.nordicsemi.com/f/nordic-q-a/29792/internal-rc-slow-clock-problems-with-sdk12-and-sdk14/118193#118193

Kind regards,

Håkon