PCA9451A / imx93 battery backup for RTC

[arekkaras]

Hello,

does the PCA9451A support battery backup for NVCC_BBSM_1V8 voltage domain ?

Is there any application note/recommendation how to keep RTC running on iMX93 while there is no external 5V power supply connected to PMIC?

Regards
Arkadiusz

[arekkaras]

Hi Guoweisun,

It was my first idea, but I realised that from this input also other LDO's are powered so it doesn't seem to be best solution.

Additionally, I am using 32kHZ RTC clock from PMIC for iMX93 as well, so in order to get this clock running IMHO whole PMIC needs to be powered ?

Regards

Arkadiusz

[guoweisun]

Hi

Yes，correct！

[guoweisun]

Hi 

Do you mean that use battery as input of LDO1 to get the backup power?