CYPD4226 PD function issue

[Peiwu]

Hi All:

In my design, negotiate with the PD adapter using CYPD4226 to output 15V to power the system.

During debugging, it was found that the PD adapter has already output normal voltage, but CCG4_ VBUS_ C_ CTR_ P1 remains low level and the voltage cannot pass through the MOS-FET.

Use the Logic analyzer to grab the PD negotiation on CC. It is found that the whole process is normal and "PS_RDY" has been obtained.

I am using CYPD4226-40LQXI_ Notebook -> Noboot project. 

According to the requirements, some modifications have been made. The top design is shown in a screenshot, and schematic for reference.

Please help check what the problem is. 

[ShifangZ_26]

Hello ,

VBUS_C_CTRL assert to LOW is match firmware design of CCG4 example code - noboot or example code.  From the schematic design, the NPN drive circuits is not able to enable it. 

Could you please refer below VBUS consumer path circuits for your design? 

Best Regards,

Lisa

Best Regards,

Lisa

Best Regards,

Lisa

[Peiwu · Accepted solution]

Hi:

I have modified the on/off logic in “config.h” and now the function is normal.

[Peiwu]

Hi:

I have another question.

CYPD4226 P0 configured as provider, charging the phone.

Apply 9V to ADAPTER_TO_SYS_POWER, and config two Source PDOs （5V and 9V). 

But it did not succeed. 

When I change 'ADAPTER_TO_SYS_POWER' to 5V and configure 1 Source PDO, the phone can charge normally. 

So 'ADAPTER_TO_SYS_POWER needs to be 5V first before negotiating high voltage? 

[ShifangZ_26]

Yes. Type-C PD specification require enable 5V and then go to higher voltage.

[Peiwu]

OK，Thanks