nRF51822: Read/Write WDT registers without HFCLK XOSC will increase sleep current to 700uA

RE: nRF51822: Read/Write WDT registers without HFCLK XOSC will increase sleep current to 700uA

Hung Bui — Mon, 04 Apr 2016 12:45:55 GMT

Hi,

Just a small update, the case has been forwarded to R&D and we reproduced on both nRF51 and nRF52. I noticed that if you keep the WDT running when the CPU sleeping, the current consumption remains low as expected. I guess you can use that as a workaround for now, and use an RTC or smth to feed the dog.

RE: nRF51822: Read/Write WDT registers without HFCLK XOSC will increase sleep current to 700uA

Hung Bui — Wed, 16 Mar 2016 16:01:50 GMT

Hi LittleMouse,

I have tested and confirmed the issue here. Seems that if the WDT is configured with the "Halt when CPU sleep" mode, the current will be high every second time we feed the dog (most likely 16MHz clock is kept running). I will report this issue internally and see what we can do with this.