Tests on Y-cables

DING Changchang archang at canaan-creative.com
Tue Jan 6 08:39:43 UTC 2015

Hi, Werner

I have tested two Y-cables Xiangfu bought:


They both have the ID pin connected to GND in USB Micro B port as the 
OTG host.

The first one should meet all the needs:
Works fine when connecting usb keyboard/mouse/disk on the OTG slave (the 
standard USB A female)
The power branch does deliver power to both slave and host, only failing 
in charging a Nexus5. But it can charge a Nexus4 and power up a RaspberryPi.

One problem is that the power branch has a Micro B female and is not 
long enough. But we can connect it with a Micro B male to Standard A 
male cable which is very easy to get:

The second one has a chip inside.
It cannot work properly when all three ends are in use.

Another cable Xiangfu ordered should arrive in a few days. I will test 
it later.

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