I2C Pull-Up Resistor Calculator

Choosing the correct I2C pull-up resistor value is critical for signal integrity. This calculator follows the NXP I2C specification to determine the valid Rp window based on bus capacitance and required rise time.

Typical: 3.3 V or 5 V
Includes trace, I/O pin, and connector capacitance. Max 400 pF (Std/Fast).
Std: ≤1000 ns | Fast: ≤300 ns | Fast-Plus: ≤120 ns

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