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Original question:

MSP430FR6989: Battery support for MSP430FR6989 RTC?

MSP430FR6989: Battery support for MSP430FR6989 RTC?

Rohit6230
Intellectual 765 points

Part Number: MSP430FR6989

Hello,

How to activate msp430fr6989 inbuilt rtc when my system fully power off. so that I can get current time whenever i turn on my system.

  • 0
    TI__Expert 7555 points
    Hello,

    Please elaborate what you mean by "system fully power off." Do you mean that you want to shut the device down into a very low power state, or do you mean that external power will be disconnected from the device? The MSP430FR6989 does not have a dedicated battery backup feature, so you will need external power applied at all times to the device for the RTC to be operational.

    Regards,
    Walter
  • 0
    Guru 26200 points

    Hello,

    RTC_C can operate in LPM3.5.
    It means that you can keep it running with battery drain at about 500 nA (in room temperatures).
    It is less than 5 mAh per year!

    In my opinion, you should change your h/w and s/w architecture.
    Don not turn off your system, just go to LPM3.5 with RTC_C as the only one peripheral running.

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