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PCA9306: When EN low, there is an abnormal sagging waveform on the SDA

Hale Tan
Expert 3770 points
Part Number: PCA9306

Tool/software:

Hi team,

My customer had a question about PCA9306.

The schematic is as below: the left and right both has pull up, left host (PUSH-PULL), right salve (OD), with EN low, they observed an abnormal sagging waveform on the SDA. There is also a strong correlation with the SCL of host. Is there a reasonable explanation for this? Is there a way to avoid it? Thank you!