S32K148 RTC external power supply

[siva280386]

Hi NXP Team,

   In S32K148 Micro, we understand that the RTC module is active in all low power modes. In Our Project , we are planning to remove the power completely to the micro to reduce the overall control board power consumption. Is there possibility a possibility to provide power source to RTC module externally , to let this run still and when the MCU is powered up back, we still see the RTC timer running to know the sleep time of our control system. I remember some high end micros in NXP support different power supply pins to different modules of the micro controller , like ADC , RTC... 

   We also read that RTC registers get reset on MCU power on reset. how does this work if incase there is an external power supply support?

Thanks,
Siva

[abdullah45]

Hi @ VaneB

Please explain if there is an input pin for the VDD supply.

B.R.

[VaneB]

Hi @abdullah45 

I suggest you take a look at Hardware Design Guidelines for S32K1xx.

[VaneB]

Hi @siva280386 

The S32K1 family does not have an external power pin that allows you to keep the RTC active.

This family only has one power domain, VDD (3.3v or 5v).

B.R.

VaneB