Part Number: TPS2546EVM-064
In reply to Donovan Porter:
Thank for your quickly reply.
I tried all jumper settings, but i only get the 500mA.
Today i ask Vuzix again for the B1.2. I await a reply.
Note that the data lines are switched on even while the TPS2546 does the CDP handshake. What does it mean? The STM is set by software to SDP with 21K pull down on the D+ and D-.
In reply to Thorsten Bursche:
Thanks for the scope captures. It doesn't seem like the Vuzix is doing BC1.2 detection. Please let me know what they say.
Page 27 of the TPS2546 datasheet section 8.4.3 explains what I was saying about the internal mux being switched on even when the TPS2546 is in CDP mode.
I do not think this will be an issue. The 21k ohm the STM datasheet recommends is for detecting USB2.0 speed of the device connected.
we still waiting on an answser from Vuzix about the charging mode.....
we figured out that it depend on the usb cable...... We changed from a no name usb cable to the "Vuzix" cable and we get more than 500mA charge current. So the stand alone mode is fine.
Now we connected the customer PCB with the stm to the TPS with the Vuzix. The current is ok (we charge the Vuzix before) but no data communication.
We scope the Start Up via Enable the TPS:
Without the TPS we scope this: SDP Mode
Do you have an idear what we are doing wrong?
Awesome! Glad you guys got it working.
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