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Using the internal RCOSC_LF as the sleep clock has a net effect on the device current consumption as compared to board designs that utilize an external 32 kHz crystal oscillator. The difference in current consumption varies depending on the configured role of the device. For peripheral (slave) devices in a Bluetooth Low Energy connection, the current consumption will be higher when using the RCOSC_LF as compared to using an external 32 kHz crystal; however, the increase in current consumption is dependent on a number of factors. This increase is due to:
• Performing the calibration at a certain interval
• The extended receive window due to the maximum allowed sleep clock accuracy (± 500 ppm, vs.
typically ± 40 ppm with a 32 kHz crystal).
