4 Replies Latest reply on Feb 4, 2019 9:50 PM by SananyaM_56

    CY7C65215A holds I2C (SCB0) bus low until USB connected

    BeUh_3903566

      I am using a CY7C65215A as a USB - I2C bridge acting as the I2C master. If I power my system on without USB connected to the 215A, the 215A holds my I2C lines low.

       

      After I connect USB to the 215A, I see some activity on the I2C lines for a few seconds (driven by 215A), and then it lets go of the lines and they are pulled high. After the lines are pulled high, I can disconnect the USB from the system and the I2C lines are still inactive (pulled high).

       

      Any thoughts on why this is happening?