S32K344 wake up condition without core power 1.5V

[supermoves]

Hello.

Is it possible for the S32K344 to receive a signal from the WKPU to wake up with the core powered off in the sFS26 PMIC?

The configuration I'm thinking of is to have both the S32K344 and FS26 in standby mode and pass the wakeup signal to the S32K344 to wake up the PMIC with the SPI CSB pin.

I was wondering if this configuration is possible.

[danielmartynek]

Hi @supermoves,

If PMC_CONFIG[LMAUTOEN] = 1 and PMC_CONFIG[LM_EN] = 0, which is the default configuration, the MCU switches between the Boot and Last mile last regulator automatically depanding on the V15 voltage level (LVD15S). So, if the V15 is below the threshold, the V15 is generated from VDD_HV_A.

If you have any question regarding FS26, post it in the Power Management community.

https://community.nxp.com/t5/Power-Management/bd-p/Power-Management

Regadrs,

Daniel

[G_sky]

Hello, do you mean that when V15 on, BOOT regulator automatically off?

[danielmartynek]

Hi @G_sky,

Once V15 voltage is above 1.425V and PMC_CONFIG[LMAUTOEN] = 1 and LMEN = 0, which is the default configuration, the regulator switches from the Boot regulator to the Lastmile regulator. And back to Boot regulator when V15 voltage drops below the threshold.

BR, Daniel