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

[Balu Varkala]

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

[awneil]

It's up to you to evaluate whether the inbuilt RTC meets your specific requirements and constraints!

Balu Varkala said:

PLease provide the connections for external RTC

That will depend on the RTC you choose!

Quite likely, it will be I2C - maybe plus a couple of connections for alarms, etc  ...

[Jørgen Holmefjord]

Hi,

The RTC in the nRF52 series ICs is not a Real-Time Clock and it is not intended to keep time, it is a low-power timer named Real-Time Counter. If you want to keep track of time when the chip is in system OFF mode, or power is cut, you need to add an external Real-Time Clock to your design.

Best regards,
Jørgen