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Internal pull down value and suggested pull up for i2C

St9
Associate

Hi i am using STM32U585 to interface with fuel gauge using i2c. I want to know the internal pull down of ST MCU and if needed what should be the external pull-up resistance value.

1 REPLY 1

I2C doesn't use a pull-down, it's an Open-Collector / Open-Drain type situation, the transistor switches to Ground

Pull up-down internally is around 40K, depending on how aggressive a rising edge you want, perhaps 2K7 externally

https://www.st.com/resource/en/datasheet/stm32u585zi.pdf

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