1 Reply Latest reply on Mar 19, 2018 8:51 PM by ShifangZ_26

    CCG3PA PD Negotiation issue

      I'm having an issue using the CCG3PA Eval kit (CY4532) to charge certain devices. Under normal operating conditions, and using the latest stock Power Adapter firmware, I am unable to charge Apple Mac laptops. The issue appears to stem from a USB-C negotiation error, although I can't be certain.


      I am monitoring the voltage of the Type-C VBUS line, and (when the USB Type-C connector is plugged in) the voltage seems to endlessly cycle between 0V and 5V. While the Apple computer recognizes there IS a charger plugged in, it will not draw any power from the device (0 watts). However, if I use a USB-A to USB-C adapter connected to the USB-A port, I can charge the laptop with about 5W. It's only when using the Type-C port on the CCG3PA EVK Main Board that I cannot charge the computer.


      The CCG3PA will charge a Google Pixel 2 XL phone with no issue; monitoring the same Voltage test point, it cycles between 0V and 5V once, and then remains at a steady-state voltage of 9V.


      I am running the latest firmware (3.1.2), with the CYPD3171-24LQXQ_cla_3_1_2_1511_0_0_0_pa.cyacd firmware file.

      Does anyone have any suggestions or have seen this issue before?