temperature and current consumption

RE: temperature and current consumption

Hung Bui — Tue, 10 Jan 2017 10:17:13 GMT

Did you set the pin to output or input ? We need to clarify it was the issue with the GPIO pin. When in input mode, I don't think the pin would cause any current draw except if you enable GPIOTE PIN interrupt, but the current consumption should be nearly 1mA as the 16MHz will be kept running.

In your tests, how many chips have this problem and how many doesn't have ? Could you send the schematic, layout and a photo of the test board(s) ?

Could you reproduce the issue on a Nordic Development Kit ?

RE: temperature and current consumption

hunterliuyi — Tue, 10 Jan 2017 00:43:41 GMT

Hi,Hung Bui , We have located the problem probably, before we have a GPIO setting to NOPULL and it have been disconnected from anything,so it was floating, if we didnt set that GPIO, it seems the current came back to normal. However,some chips dont have this problem ,I am not sure why, and I am also curious that why the current is related to the temperature. Thanks a lot.

RE: temperature and current consumption

Hung Bui — Mon, 09 Jan 2017 13:04:43 GMT

Hi Hunter,

You may want to provide some more detail about your board, schematic, layout.

50-100uA was with the nRF51 in deep sleep mode ? It's pretty high if it's just the nRF51 in sleep mode. Usually it should be 3uA or less. So I suspect something else is drawing current and the parasitic current consumption is changed when you touch the board with a finger.