nrf52 consumes quite lot of power

RE: nrf52 consumes quite lot of power

Ole Bauck — Fri, 29 Jul 2016 12:35:21 GMT

Then you are also measuring the current of the debug/interface chip, LEDs and other chips on the board. To measure the power consumption only for the nRF52 chip you have to measure over the P22 header, see here for more information.

RE: nrf52 consumes quite lot of power

Matts — Fri, 29 Jul 2016 12:28:12 GMT

And yes, I'm using the v1.1 PCA10040 HW.

RE: nrf52 consumes quite lot of power

Matts — Fri, 29 Jul 2016 12:27:31 GMT

No, from USB. I originally had it in USB hub that showed the consumption, but our HW dude had a usb cable just for this.

RE: nrf52 consumes quite lot of power

Ole Bauck — Fri, 29 Jul 2016 12:20:19 GMT

4.3 - 5mA is too high to be the HFCLK alone (this is about 400-450uA). CPU run current should also be higher than this (~7mA).

You are measuring over "P22: nRF Current Measurement" header next to the usb connector right. Are you using the latest nRF52 DK, PCA10040 V1.1.0?

RE: nrf52 consumes quite lot of power

Keton — Fri, 29 Jul 2016 11:14:29 GMT

TWI is high power consumption peripheral due to its dependence on HFCLK. Please make sure that you disable TWI hadrware when you are not using it. Also I'd suggest going trough your code and checking what hardware has been enabled on init. I.e. it's common mistake to initialize UART and leave it running.