Testing with the NRF52840 dongle and the Power Profiler Kit. I see a reading of ~5uA when sleeping without SAADC enabled.
I use this code to enable SAADC
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void saadc_init(void)
{
ret_code_t err_code;
nrf_saadc_channel_config_t saadc_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);
nrf_drv_saadc_config_t nrf_drv_saadc_config = NRF_DRV_SAADC_DEFAULT_CONFIG;
err_code = nrf_drv_saadc_init(&nrf_drv_saadc_config, saadc_callback);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_channel_init(0, &saadc_channel_config);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_buffer_convert(m_saadc_samples, SAADC_SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);
}
My power usage when sleeping is now 913uA
My final product will sleep for 2 minutes, wake by timer, read the SAADC value, advertising the value, sleeping for another 2 minutes. repeat.
My expectation is that I should uninit the SAADC before I call nrf_pwr_mgmt_run(). And then call saadc_init() when my product wakes. I'm not sure how to uninit the SAADC.
