topic Re: S32K344 V15_MCU in S32K

S32K344 V15_MCU

luyq — Thu, 14 Oct 2021 08:31:21 GMT

Hello,

I want to ask what is the function of V15_MCU power supply? Because I cut off the V15_MCU power supply, the board works normally, no abnormality was found.

Looking forward to your reply!

Re: S32K344 V15_MCU

danielmartynek — Thu, 14 Oct 2021 08:43:37 GMT

Hello @luyq,

It is explained in the RM.

The internal V11 domain can be powered by the Boot regulator (from VDD_HW_A) or by the Last Mile regulator (from V15).

Regards,

Daniel

Re: S32K344 V15_MCU

luyq — Thu, 14 Oct 2021 09:04:34 GMT

Hello,

Well, I also saw this explanation, but I still don’t know the specific role of this V15.

Re: S32K344 V15_MCU

danielmartynek — Thu, 14 Oct 2021 09:31:24 GMT

It is a high-current input for the core and logic supply.

Please refer to the datasheet.

Table 15. Low speed RUN mode supply currents shows power consumption with and without the last mile regulator in low-speed modes.

Table 16 and Table 17 show the consumption in high-speed modes.

In other words, the V15 (last mile regulator) must be enabled if PLL is used.

Regards,

Daniel

Re: S32K344 V15_MCU

luyq — Thu, 14 Oct 2021 10:43:16 GMT

Thank you very much for your patient answers. My data sheet may not be up-to-date and there is no relevant description. Can you send me the latest data sheet? Thank you very much!

Re: S32K344 V15_MCU

danielmartynek — Thu, 14 Oct 2021 10:47:33 GMT

All the latest S32K3 documentation is available on DocStore.

Please download it officially from there.

BR, Daniel