As you could see from the below image, the SCL signal at 400kHz is NOT a good square wave.
1) Why & how to solve it, please?
2) Also, why SCL is between 0.4V to V_DD=3.25V? Shouldn't it be 0V to V_DD=3.25V?
As you could see from the below image, the SCL signal at 400kHz is NOT a good square wave.
1) Why & how to solve it, please?
2) Also, why SCL is between 0.4V to V_DD=3.25V? Shouldn't it be 0V to V_DD=3.25V?
1. Your pullup resistance value is too high. See: electronics.stackexchange.com/.../473799
2. Where do you get these figures from? It's probably allowing for the fact that actual electronic circuits are not perfect.
1. Your pullup resistance value is too high. See: electronics.stackexchange.com/.../473799
2. Where do you get these figures from? It's probably allowing for the fact that actual electronic circuits are not perfect.
Also:
1. Your probe typically adds a 12pF capacitive load when attached, requiring stronger pull-ups.
2. Where on your circuit is your probe's ground reference attached? It seems like it has a lower voltage potential than the TWI circuit's ground reference.