TWI High Idle Current PAN 89

RE: TWI High Idle Current PAN 89

MartinBL — Wed, 04 Oct 2017 11:21:38 GMT

It should be enough to just stop the PWM.

Is it possible for you to upload your code so I can debug it here? You can do it in confidence on MyPage if your prefer that.
Do you have any tools you can use to measure and plot the current overtime? It might be useful to know if e.g. the current is idles at 400uA or if there are periodic spikes pulling up the average current.

RE: TWI High Idle Current PAN 89

Dave_couling — Mon, 02 Oct 2017 18:26:46 GMT

Should the PWM also be uninitialized?

RE: TWI High Idle Current PAN 89

Dave_couling — Mon, 02 Oct 2017 17:11:53 GMT

I am certain that the PWM module is stopped, therefore the HFCLK should also be disabled. Unless the inclusion of the TWI module keeps the HFCLK up?

RE: TWI High Idle Current PAN 89

MartinBL — Mon, 02 Oct 2017 07:26:17 GMT

The PWM requires the HF clock to be running. With all the internal voltage regulators, etc. that is needed to drive the clock this will add up to about ~400uA++, dependent on which clock source you are using. So yes, the PWM might be the source. But then it is not a bug, but a "feature".

RE: TWI High Idle Current PAN 89

Dave_couling — Sat, 30 Sep 2017 01:14:19 GMT

Could the PWM driver also influence this bug?

RE: TWI High Idle Current PAN 89

Dave_couling — Thu, 28 Sep 2017 19:07:29 GMT

Yes, the bug still persists. I am using the power management module, nrf_pwr_mgmt_run(); but not directly enabling the DCDC

RE: TWI High Idle Current PAN 89

MartinBL — Thu, 28 Sep 2017 06:57:07 GMT

How about if you only use the SAADC and TWI?

Are you using the DCDC converter?

RE: TWI High Idle Current PAN 89

Dave_couling — Wed, 27 Sep 2017 18:39:14 GMT

I've found that the SAADC module is directly affect by the TWI module. If both are initialized then the uninit() workaround on the TWI doesn't work. If I don't use SAADC it is fine however.

I had to manually unint() the SAADC module, even though i'm using SDK12.3.0 and have enabled the low_power feature.

RE: TWI High Idle Current PAN 89

MartinBL — Wed, 27 Sep 2017 09:06:36 GMT

Do you also use timers and/or SPI? The PAN is actually not limited to TWI and GPIOTE only, as I mentioned here the other day.