hard20 pts · first answer countsfirmwarei2chardware-debugging
Largest pull-up for 400 kHz I2C
A 400 kHz I2C bus has 200 pF of capacitance. Fast-mode allows a 300 ns rise time (30% to 70%), and t_r ≈ 0.847 × R × C. What is the largest pull-up resistor you can use?
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