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Adding 5V external pull up in STM32 MCU i2c port

Question asked by mohankumar Arumugam on Jul 11, 2018
Latest reply on Jul 13, 2018 by STOne -32



I am using the MCU STM32F439 in my Project. We are using I2C which connect other slaves with 5V logical level.

But the STM32F439 says the I2C port in the STM MCU is not a "true OPEN Drain" port. Can connect an 5V external pull ups to the STM MCU's I2C Port. Will that damage the internal circuitry(like internal PMOS) even after disabling the internal pull ups?


Will the internal pullup circuits be totally disconnected if the internal pull ups in the I2C port is disabled?


Thanks in advance.


Best regards,