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NCF
Visitor II
October 27, 2020
Solved

STM32MP157 OTP voltage

  • October 27, 2020
  • 1 reply
  • 1166 views

Hi guys,

I'm designing a custom board with STM32MP157C using the MB1263 board as reference.

The MB1263 reference design shows the VDD_OTP pin tied to VDD, which is 3V3 for that particular board.

My custom board uses VDD = 1V8 instead of 3V3.

Should I tie the VDD_OTP to 3V3 or 1V8?

I could not find any reference on VDD_OTP recommended voltage.

Thank you in advance.

    This topic has been closed for replies.
    Best answer by PatrickF

    VDD_OTP does not exist in product documentation, board schematics were done on a very first engineering sample silicon where this pin was present for test purposes.

    On final products, there is no VDD_OTP pin, OTP programming voltage is internally tied to VDD. The former VDD_OTP pin you can see on some schematics is now a VDD pin in product datasheet.

    So, no worries, OTP could be programmed with either VDD = 1.8 or 3.3V.

    Regards.

    1 reply

    P
    PatrickFAnswer
    Technical Moderator
    October 28, 2020

    VDD_OTP does not exist in product documentation, board schematics were done on a very first engineering sample silicon where this pin was present for test purposes.

    On final products, there is no VDD_OTP pin, OTP programming voltage is internally tied to VDD. The former VDD_OTP pin you can see on some schematics is now a VDD pin in product datasheet.

    So, no worries, OTP could be programmed with either VDD = 1.8 or 3.3V.

    Regards.

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