USB EZ-PD™ Type-C

[Anderson_Lin]

Hi Everyone

How to solve the following problems.

TD.PD.PHY.E6 Receiver Swing Tolerance - Testing Upstream Port (trace)
FAILED	Setting Tx Amplitude to 1.2 V	UUT must respond to all 1000 BIST Data packets (996 answered)
FAILED	Setting Tx Amplitude to 1.05 V	UUT must respond to all 1000 BIST Data packets (996 answered)

TD.PD.PHY.E7 Receiver Bit Rate Tolerance - Testing Upstream Port (trace)
FAILED	Setting Tx Bit Rate to 330 kbit/s	UUT must respond to all 1000 BIST Data packets (996 answered)
FAILED	Setting Tx Bit Rate to 270 kbit/s	UUT must respond to all 1000 BIST Data packets (996 answered)

TD.PD.PHY.E8 Receiver Bit Rate Deviation Tolerance - Testing Upstream Port (trace)
FAILED	Deviating Tx Bit Rate to -0.25%	UUT must respond to all 1000 BIST Data packets (996 answered)
FAILED	Deviating Tx Bit Rate to +0.25%	UUT must respond to all 1000 BIST Data packets (996 answered)

TD.PD.PHY.E1 BIST Test Data - Testing Upstream Port (trace)
FAILED	Sending 1000 BIST Data	UUT must respond to all BIST Data packets (996 answered)

[MallikaK_22]

Hi,

>> Please provide the board schematics.

>> Kindly confirm if you used the firmware with the default configuration.

Regards,

Mallika

[Anderson_Lin]

Hi Mallika

Thanks for your reply.

Use USER FW + CY4532 EVM is ok no fail.
The picture below is the customer's PCBA

[MallikaK_22]

Hi,

Could you please provide your schematics for review.

Regards,

Mallika

[Anderson_Lin]

It is CYPD3171 schematics

[MallikaK_22]

Hi,

From the schematics, the connections of VBUS_IN_DISCHARGE and VBUS_C_MON_DISCHARGE are unclear. Could you please elaborate on it?

Regards,

Mallika

[Anderson_Lin]

Dear Sir

FYI

[MallikaK_22 · Accepted solution]

Hi,

I suspect the issue to be related to power supply domain. The schematic provided is incomplete and I cannot clearly understand the wiring of VBUS_IN_DISCHARGE and VBUS_C_MON_DISCHARGE. Please refer to Q1 HARDWARE in the KBA: https://community.cypress.com/t5/Knowledge-Base-Articles/CCG3PA-Hardware-and-Software-FAQs-KBA231523... 

Also, please ensure that the CCG3PA_GND is different from the Type-C GND. They should be kept separated.

[Anderson_Lin]

Dear Sir

Product application is sink only ,
So CCG3PA_GND and Type-C GND should be the same, right?

[MallikaK_22]

Hi,

I meant the Type-C receptacle GND line should not be directly connected to CCG3PA GND pin. Please look into the CY4532 schematics for the Type-C receptacle GND connection.

Also, look at the KBA for Rsense connection: https://community.cypress.com/t5/Knowledge-Base-Articles/Rsense-Design-Considerations-On-CCG3PA-Appl... 

For sink applications, VBUS_IN_DISCHARGE should be connected to VBUS of Type_C interface and VBUS_C_MON_DISCHARGE to VBUS source.