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MSP-EXP432E401Y: Set up so that if main power fails it switches to a backup battery to power RTC and preserve the RTC clock

Kirushigan Parathan
Expert 1180 points
Part Number: MSP-EXP432E401Y

Hi,

I cant seem to find in the user guide how to set up the VBAT pin on the MSP to be a battery backup for the RTC. I want to be able to use the VBAT to power the RTC if/when the main power is lost. 

  • 0
    TI__Genius 12315 points

    Hello,

    This is the function of Hibernation module.

    The Hibernation module power source is supplied by VDD as long as it is within a valid range, even if VBAT > VDD. The Hibernation module also has an independent clock source to maintain a real-time clock (RTC) when the system clock is powered down. Hibernate mode can be entered through one of two ways: • The user initiates hibernation by setting the HIBREQ bit in the Hibernation Control (HIBCTL) register • Power is arbitrarily removed from VDDwhile a valid VBAT is applied.

    Please see the Hibernation module in Technical Reference Manual for  detailed configuration. An example is as below:

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