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nRF52840 inbult RTC is there are need to provide external RTC.

Hello,

nRF52840 is having the inbulit RTC for keeping the time.

Should i need to use external RTC with coin battery for even after power off the BLE nRF52840.

PLease provide the connections for external RTC with nRF52840 Soc

Thanks 

Balu

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