JetsonNano I2C SDA, SCL Pull-up Resister values ? 47K pull-up(R1608)

Jetson Nano

189PIN: I2C1_SCL ( +3.3V, On Module 2.2K pull-up )

191pin: I2C1_SDA ( +3.3V, On Module 2.2K pull-up )

“Is there any issue if I connect a 47K resistor as a pull-up on an open-drain output?”

R = 1 / ( (1/2.2K) + (1/4.7K) ) = 2.1K ohm

Refer to I2C bus specifications for pull up value recommendations and calculations. 47K pull up will be too weak and depends on your I2C bus trace lengths and loading/bus capacitance amongst other factors.

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.