ADC power usage

[bart]

Hi,

At command, I'm sampling ADC for a short period of time. What I noticed is that the current consumption of the chip goes up 2mA, even after the sampling is stopped (also explicitly with NRF_ADC->TASKS_STOP = 1). I tried adding a NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Disabled, but that didn't change anything either.

As far as i know, the HF clock has already been started during boot.

I'm using the NRF51822, SDK 8.1, SD 130 1.0.0.

Does anyone know where this 2 mA usage might come from?

[bart]

It seems like enabling the interrupt is what fixes this, I don't really understand why it would consume more current without using interrupt though.

[Oliviertl]

Hi Bart, how did you enabled interrupt?

[bart]

Well basically with err_code = sd_nvic_EnableIRQ(ADC_IRQn); and defining ADC_IRQHandler, like in most examples (like here).