2024-05-27 11:21 AM
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.
2024-05-27 11:33 AM
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