This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
TPS2546: TPS2546 USB certification issue
Part Number: TPS2546
If a standalone battery charging device (TPS2546) is used on a downstream hub/host port with CDP mode enabled, then the USB 2.0 Hub/Host Downstream Port Test J portion of the compliance testing will fail. This occurs because the test conditions mimic the disconnected CDP state and cause the TPS2546 to increase the voltage level on DM. The standalone battery charging device is not aware that a test J packet is being sent. The failure shows up as D- line measuring ~20mV when the D+ line is driven high.
There is no Impact on end-user, the problem will only occur when the Test J mode is forced during compliance testing.
This is not a real world failure. This can be verified by forcing the TPS2546 out of the disconnected CDP state. If a Test J failure occurs on a battery charging enabled port, use a header to short DP and DM on the test fixture for 1-2 seconds and rerun the test. This forces the battery charging device out of the disconnected CDP state and allows the test to pass.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to user4773197:
Yes this method is permissible
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.