RE: Use NRF_CLOCK_LFCLKSRC_RC_250_PPM_250MS_CALIBRATION

Ron — Thu, 16 Jul 2020 10:45:45 GMT

Hey,

Where can I see the calibration frequency effect on current consumption?

Thanks!

RE: Use NRF_CLOCK_LFCLKSRC_RC_250_PPM_250MS_CALIBRATION

Håkon Alseth — Mon, 15 Aug 2016 07:46:18 GMT

Hi,

If you change this line:

nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

To this:

// see nrf_sdm.h for more details
nrf_clock_lf_cfg_t clock_lf_cfg = 
{
    .source = NRF_CLOCK_LF_SRC_RC,
    .rc_ctiv = 16, // Interval in 0.25 s, 16 * 0.25 = 4 sec
    .rc_temp_ctiv = 2, // Check temperature every .rc_ctiv, but calibrate every .rc_temp_ctiv 
    .xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_250_PPM,
};

This configuration will set RC oscillator, and check for temperature delta every 4 second, and calibrate the RC every 8 second.

Cheers, Håkon