topic Re: 5V supplies for FS32K148UJT0VLQT RMII Interface? in S32K

5V supplies for FS32K148UJT0VLQT RMII Interface?

peter123 — Thu, 29 Jun 2023 21:09:11 GMT

I am having FS32K148UJT0VLQT on my design. Most of my I/O interfaces are 5V, but RMII interface requires 3.3V. I wonder if I can supply 5V to FS32K148UJT0VLQT and level-shift only the RMII interface signals down to 3.3V. I assume with 5V supplies, the RMII signals will become 5V and I can simply level shift them to 3.3. But I am not sure if the FS32K148UJT0VLQT RMII circuitry can handle 5V internally. Not sure if this is a possible solution? Thanks.

Re: 5V supplies for FS32K148UJT0VLQT RMII Interface?

Robin_Shen — Fri, 30 Jun 2023 10:06:16 GMT

I think you can refer to the schematic of S32K148EVB-SCH-29644-RB, TXB0104 is used.

Best Regards,
Robin
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Re: 5V supplies for FS32K148UJT0VLQT RMII Interface?

peter123 — Fri, 30 Jun 2023 17:15:52 GMT

@Robin_Shen Thanks so much. NXP Tech Support team is impressive.