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USB EZ-PD™ Type-C Forum Discussions

OlEr_1999891
Level 5
Level 5
50 replies posted 25 replies posted 25 sign-ins

Hi!

We have created a couple of different dongle-type devices using CYPD3123 / CYPD3125 where a Windows-machine communicates via USB 2.0 FS to the CCG3 via USB HID and it has worked well. However, in our latest design, the Windows machines didn't discover the USB device. Worked on different Linux devices, e.g. RPI. We tried to manually add some resistors to the D+/D- lines and then it worked on Windows.

So question is: When using the built-in USB FS device in CCG3, should there be serial resistors between the plug and IC on D+/D-? And if yes, what value?

Cheers

Olof

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ShifangZ_26
Moderator
Moderator
Moderator
10 likes given 250 sign-ins 1000 replies posted

Hi Olof,

1. It shall no need a serial resistors between the plug and IC on D+/D-.

2. If a serial resistors can resolve your issue, which is means the layout on D+ and D- trace should be take a look the impedance matching with 90 Ohm.

Best Regards,

Lisa

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1 Reply
ShifangZ_26
Moderator
Moderator
Moderator
10 likes given 250 sign-ins 1000 replies posted

Hi Olof,

1. It shall no need a serial resistors between the plug and IC on D+/D-.

2. If a serial resistors can resolve your issue, which is means the layout on D+ and D- trace should be take a look the impedance matching with 90 Ohm.

Best Regards,

Lisa

0 Likes