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NRF52840 auto refresh mode rate

During the System On mode and System off mode, I see a spike in current of 400 uA with frequency of around 8Hz. Is it due to the refresh mode or is this different. Could anyone please tell me the refresh mode frequency rate and the current consumed during this.

I have attached the system off mode current analysed using power analyser

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0 Stian Røed Hafskjold over 4 years ago

Hi

Yes, this looks like refresh mode. The frequency depends on the current being drawn on the regulator output. In system OFF mode the refresh interval is at 100-150 ms, and in system ON idle mode it's at 30-50 ms, typically.

The current consumed during refresh mode is documented here: https://infocenter.nordicsemi.com/topic/ps_nrf52840/_tmp/nrf52840/autodita/CURRENT/parameters.i_sleep.html?cp=4_0_0_4_1_0_0

Note that the numbers in the PS are typical numbers only, and there will be device to device variations.
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0 Stian Røed Hafskjold over 4 years ago

Hi

Yes, this looks like refresh mode. The frequency depends on the current being drawn on the regulator output. In system OFF mode the refresh interval is at 100-150 ms, and in system ON idle mode it's at 30-50 ms, typically.

The current consumed during refresh mode is documented here: https://infocenter.nordicsemi.com/topic/ps_nrf52840/_tmp/nrf52840/autodita/CURRENT/parameters.i_sleep.html?cp=4_0_0_4_1_0_0

Note that the numbers in the PS are typical numbers only, and there will be device to device variations.
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