i.Mx93 BBSM

[NishantChorge]

For In RTC/BBSM mode, is there an automatic power switchover mechanism?

For example:

a) When the main VCC is available, does the RTC use power from the main supply?

b) When the processor VCC is removed, does the RTC automatically switch to the backup battery   

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The explicit claims about automatic glitch-free battery switchover and no external ORing are not verified by the documentation I found

[yipingwang]

unfortunately, imx93 doesn't have this feature, the RTC uses BBSM_1V8 as the power supply, that means you may need to an external LDO to replace the internal LDO1 (BBSM) of PMIC(PCA9451), then the power will switch between 5V and 3V battery automatically.

BBSM_1V8.png