| |
| | |

AVHzY Forum

 Forgot password?
 Register
Search
View: 1141|Reply: 2

QC2.0 test

[Copy link]

1

Threads

2

Posts

9

Credits

Newbie

Rank: 1

Credits
9

 United States

Post time: 20-04-2018 10:59:56
| Show all posts |Read mode
Edited by xbj20090320 at 20-04-2018 11:03

Hi
  I just got a CT-2,when i test it ,i found the profile couldn't meet the qc2.0 standard completely.according the qc2.0,the D+=D-=0.6 more than 1s ,the D-=0.then the HVDCP is ready to accept the request.but as the below photo,the D-level always kept at 0v. why? thank!

Capture11.PNG
Reply

Use magic Report

1

Threads

2

Posts

9

Credits

Newbie

Rank: 1

Credits
9

 United States

 Author| Post time: 20-04-2018 11:06:06
| Show all posts
Edited by xbj20090320 at 20-04-2018 11:07

the QC2.0 Standard profile looks like this.
Capture12.PNG
Reply

Use magic Report

0

Threads

24

Posts

110

Credits

Moderator

Rank: 7Rank: 7Rank: 7

Credits
110

 China

Post time: 21-04-2018 00:44:57
| Show all posts
Thanks for your feedback.

First I want to say that when CT-2 is developed, there're no much documentation, all we can do is trying to reverse-engineer how it works. Even now, I can only see a little documentation, in some datasheets of chips with HVDCP supported. I guess the HVDCP standard is still not public, your pictures seems directly released from Qualcomm.

As far as I know (Tell me if my statements went wrong), HVDCP hosts should first support DCP, which means that at the initial state, the host should SHORT D+ and D-, this means when you apply a voltage on D+, and if the charger is HVDCP supported, the same voltage should be on D-. Actually I verified this on a lot of chargers, they all have a short on D+ and D- initially. So I guess you didn't get this result on a charger which is not HVDCP supported.

Please tell me if this procedure isn't standard.
Reply

Use magic Report

You have to log in before you can reply Login | Register

Points Rules

Archive|Mobile|Dark room|AVHzY Forum

17-07-2019 11:17 GMT-8 , Processed in 0.049077 sec., 26 queries .

Powered by Discuz! X3.4

AVHzY version, Rev. 864, © 2009-2019 forum.avhzy.com

Quick Reply To Top Return to the list