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MSP430F552x + TPS3620-33 = RTC data retention?

Arturo Gurrola
Prodigy 50 points
Other Parts Discussed in Thread: MSP430F5529

Hi TI forums,

 

I am designing an application using MSP430F5529, for this application I need the RTC running all the time (backed up).

So I was looking into the TPS3620-33 for the battery backup system, and I see that it has a reset feature (of course, it's a voltage supervisor).

As I understand, when the IC switches from the main VDD (because of low power) to the bakcup battery, it resets the MCU; my question is: Will this reset also get rid of my RTC data?

 

Thanks in advance.

  • 0
    TI__Mastermind 26380 points

    Hello,

    I assume the MSP430 is reset by pulling the RST line low?

    Yes, this form of reset causes a POR which will re-initialize the RTC registers.

    If the device underwent a PUC however (for ex. due to WDT timeout) then the RTC registers are retained.

    One option I would suggest is looking into using the F66xx family of 430's. This family has devices with upto 256K of flash and integrated USB.

    The device also comes with a built-in option for a backup battery and allows the RTC to continue running on the backup source.

    The device is set to sample in May so let me know if you need more details.

    Regards,

    Priya

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