https://devzone.nordicsemi.com/f/nordic-q-a/41619/what-are-unit-of-nrf_sdh_clock_lf_rc_ctivIn file sdk_config.h, in order to configure a calibration interval of 8 seconds, what number should be used in the define NRF_SDH_CLOCK_LF_RC_CTIV? The time units are not provided.en-USTelligent Community 13Wed, 19 Dec 2018 13:38:05 GMThttps://devzone.nordicsemi.com/thread/162516?ContentTypeID=1Wed, 19 Dec 2018 13:38:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cbdd978c-e9d4-4e69-88f3-7fe025ca03abJared<p>Hi</p> <p>Chapter 19.3.9 in the product specification specifies the calibration timer interval in multiple of 0.25 seconds. From the<a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.s130.api.v2.0.0%2Fstructnrf__clock__lf__cfg__t.html"> documentation</a>: <em>&quot;Must be 0 if source is not&nbsp;<a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.1.0/group___n_r_f___c_l_o_c_k___l_f___s_r_c.html#gac5af0958064c212f19db190b8ad1e7e6">NRF_CLOCK_LF_SRC_RC</a>.For nRF52, the application must ensure calibration at least once every 8 seconds to ensure +/-500 ppm clock stability. The recommended configuration for&nbsp;<a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.1.0/group___n_r_f___c_l_o_c_k___l_f___s_r_c.html#gac5af0958064c212f19db190b8ad1e7e6">NRF_CLOCK_LF_SRC_RC</a>&nbsp;on nRF52 is rc_ctiv=16 and rc_temp_ctiv=2. This will ensure calibration at least once every 8 seconds and for temperature changes of 0.5 degrees Celsius every 4 seconds. See the Product Specification for the nRF52 device being used for more information.&quot;</em></p> <p>Best Regards<em><br /></em></p> <p>Jared&nbsp;</p><div style="clear:both;"></div>