The TPS2511 Dedicated Charging Port Controller IC is failing BC1.2 testing. Our USB Charger was sent for test to TUV Hong Kong and it fails some of the test criteria. Looks to be timing issues within the IC.
During BC1.2 Tests -- The following tests failed:
DCP Handshaking Test
Primary Detection Test (Step 5)
Result: 1.559V
Limit: 0.5V to 0.7V
Secondary Detection (Step 10)
Result: 2.108V
Limit: 0.5V to 0.7V
Inspecting the Handshaking on the CRO it seems the change time is too slow -- it needs to be close to 21mS to comply with BC1.2 Specification
DCP Resistance and Capacitance Tests
Checking Resistance Between D+ and D- (Step 6)
Result: 2.976V
Limit: <1.05V
This testing was carried out at TUV Hong Kong on automated test equipment - we can send the test data from the lab on request.
We would appreciate a swift response to this issue as it is holding up completion of product qualification / release. Emails were already sent with schematics, bc1.2 testing specification and our internal testing.
Its very disappointing to be referred to this public forum for assistance. We tried the formal channel on the website and had this response:
Thank you for contacting Texas Instruments. Your request has been received and Service Request number SR#1-1435600105 has been assigned to your inquiry.
I am sorry , i haven't related test equiepment to validate this issue .
I suggest you put this question on our E2E forum for detail reply.sorry for any influence so caused.
http://e2e.ti.com/
Thank you.
Best Regards,
Service Request number for the inquiry was: Sr#1-1435600105
Look forward to hearing from someone that can help.