3 Replies Latest reply on Apr 9, 2019 5:48 AM by YatheeshK_36

    cypress CY7C65215A chip hold i2c lines low

    romac_285831

      I’m having some trouble with the cypress 65215A chip. If I program it to be in I2C mode on SCB0, either master or slave, the 215A will hold the SDA and SCL lines low until a USB cable is connected between the board and a PC, and then the cypress will release these lines. You can then remove the USB connection, and the 215A still lets the I2C lines float.

       

      I have found that programming the cypress into UART mode prevents this problem – the 215A won’t hold the I2C lines (pins 28 and 29) low.

       

      Do you have any idea what’s going on?