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NCF
NCF
Associate
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

PatrickF
PatrickFBest answer
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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