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  CP210x USB Compliance Test

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Author Topic:   CP210x USB Compliance Test
Ed Thompson
New Member 		posted June 23, 2010 03:26 PM     Click Here to See the Profile for Ed Thompson   Click Here to Email Ed Thompson     Edit/Delete Message
Has anyone successfully completed USB compliance testing with a CP21x-based product since the "Dead Battery Test" (see below) was added? I see a 17mA (fail) current draw with the CP2102EK evaluation board.

http://compliance.usb.org/index.asp?UpdateFile=Battery Charging&Format=Standard

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Tsuneo
Member 		posted June 24, 2010 12:14 AM     Click Here to See the Profile for Tsuneo   Click Here to Email Tsuneo     Edit/Delete Message
It's strange.

I plugged in / out my CP2102EK repeatedly 10 times.
I saw 0.5 mA 4 times, 16-19 mA (varying) 6 times.
The LED on the board didn't light in both cases.
In both cases, the boards work without any error, when it connected to PC.
I tested CP2103EK, too, and got similar result.
Seems 16-19 mA shows unstable state.

My CP2102/3EKs are old one. SiLabs may change device revision.
Ask to SiLabs tech support, if they have fixed this problem on recent revision or not.

Tsuneo

[This message has been edited by Tsuneo (edited June 24, 2010).]

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Ed Thompson
New Member 		posted June 24, 2010 08:36 AM     Click Here to See the Profile for Ed Thompson   Click Here to Email Ed Thompson     Edit/Delete Message
Hello Tsuneo,

Thanks for you response.

I get the same results with a new CP2102EK board and my own board. In this "unstable" state, SUSPEND and /SUSPEND pins are active as they should be, but the CP2102 draws too much current to pass the USB compliance Hub Suspend Current test.

I reported this to SiLabs tech support several weeks ago and await a solution.

Ed

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Ed Thompson
New Member 		posted August 09, 2010 04:04 PM     Click Here to See the Profile for Ed Thompson   Click Here to Email Ed Thompson     Edit/Delete Message
Looks like new CP2102 firware fixed the USB compliance curren draw before reset problem...Ed

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