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PCA9306: There is a step at Low level

user6021663
Prodigy 40 points
Part Number: PCA9306


When the SCL1, SDA1, SCL2, and SDA2 lines are low, there is a step of about 0.7V.
What should I do to lower the Low level below 0.6V?
The pull-up resistance of I2C master side(1.8V) and slave side(3.3V) uses 10kΩ.
I hope you get a reply.
  • 0
    TI__Guru* 75871 points

    Hello,

    Can you provide a scopeshot of both sides of the device SCL1/SDA1/SDA2/SCL2?

    My initial guess is the low is from an I2C static voltage offset buffer and not the PCA9306.

    Could you also provide a schematic of the PCA9306 and a block diagram of the I2C bus?

    Thanks,

    -Bobby