CYPD3177 - Pin 24, VCCD Issue (same as 351238)

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Ysuke_eng
Level 1
Level 1
First question asked Welcome!

Hello Infineon,


I am evaluating CYPD3177-24LQXQ using our developed circuit board.

But this chip didn't work collectly.  PD connection didn't work, so we could't see expected voltage(20V) from PD charger.

Now we are checking this board, as a result, we found that this chip didn't generate 1.8V at 24pin(VCCD).

This issue is same as below question(No.351238).

https://community.infineon.com/t5/USB-EZ-PD-Type-C/CYPD3177-Pin-24-VCCD-Issue/td-p/351238

I would like to know the result about this question. And please tell me the solution.

Thanks,

 

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1 Solution
HmdRahmathulla
Moderator
Moderator
Moderator
100 solutions authored 250 sign-ins 25 likes received

Hi @Ysuke_eng ,

Thank you for posting in infineon community.

VCCD Pin Voltage is related to internal 1.8V LDO. 

Two ways to supply the 1.8V internal LDO, 

1. VBUS_IN will give supply to internal LDO which will generate 3.3V (VDDD) which is used to supply 1.8V LDO.

2. External Supply to VDDD pins to by pass the internal 3.3V LDO.

please check the following in the hardware.

HmdRahmathulla_0-1681102033899.png

 

1. check the VBUS voltage. if VBUS giving the voltage 

2. check the VDDD pin to get the output of internal 3.3V LDO, if this works fine.

3. probe the VCCD and VDDD at the same time and check the voltage transition of both and share the waveform.

kindly share me your schematic to review.

Best Regards,

Mohamed Rahmathulla

View solution in original post

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1 Reply
HmdRahmathulla
Moderator
Moderator
Moderator
100 solutions authored 250 sign-ins 25 likes received

Hi @Ysuke_eng ,

Thank you for posting in infineon community.

VCCD Pin Voltage is related to internal 1.8V LDO. 

Two ways to supply the 1.8V internal LDO, 

1. VBUS_IN will give supply to internal LDO which will generate 3.3V (VDDD) which is used to supply 1.8V LDO.

2. External Supply to VDDD pins to by pass the internal 3.3V LDO.

please check the following in the hardware.

HmdRahmathulla_0-1681102033899.png

 

1. check the VBUS voltage. if VBUS giving the voltage 

2. check the VDDD pin to get the output of internal 3.3V LDO, if this works fine.

3. probe the VCCD and VDDD at the same time and check the voltage transition of both and share the waveform.

kindly share me your schematic to review.

Best Regards,

Mohamed Rahmathulla

0 Likes