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CC430F6135 - RTC power while rest of chip powered down

PaulSchoenke
Genius 3290 points
Other Parts Discussed in Thread: CC430F6135, MSP430F6736

Hello:

I have designed the CC430F6135 into a new project that is battery operated.  I would like to use the on-chip RTC to save some space/cost on my project.  We need to keep the RTC going when the unit is unpowered so that the time/date remain correct.  I have a CR2032 battery on the board to power the CC430F6135's RTC during those times when the system is shut down, but I'm not sure which power pin(s) to drive with the battery. Do you have any suggestions on how to keep the RTC alive from the battery without having all the other loads on that would draw extra uA?

Any feedback or input is welcomed and appreciated!

Thanks again!

Paul

  • 0
    Guru 92251 points

    The CC430F6135 has a RTC_A module, for which the lowest power mode in which it can operate is LPM3. The CC430F6135 has only one set of DVCC supply pins used to power the digital logic in all supported power modes. Therefore, your design will have to supply battery power to the DVCC pins when the "main" supply is shut down.

    (Some other devices such as the MSP430F6736 have a RTC_C module which is powered from a separate Auxiliary Supply System)

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