On a stm32f429I discovery board, which are the voltage of the SDA and SCL pin in I2C communication? May I connect it to a I2C device with 3.3 V. Thanks.

Hicss.2033 · ‎2019-12-05

Tesla DeLorean · ‎2019-12-05

Voltage likely closer to 3V, buys should work on 3.3V I2C device.

You could probably measure the voltage on pins also.

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Hicss.2033 · ‎2019-12-05

Thanks for the fast answer,. I don't understant the meaning of "buys". Can you explain better?

Besides, I need of external pull-up resistors (I'm new of the matter)?