TUSB8041: TUSB8041 support Andriod

Hi Kevin,

TUSB8041 uses generic hub drivers and does not require any special software to support different systems.  Please note that the TUB8041 does not support USB role reversal (host / device swap)  operation.

Regards,

JMMN

Hi JMMN

The problem is that our customers use this TUSB8041 to hot plug the external USB flash in the down stream port.
In the Android system, sometimes it will not be recognized.

For this question, is there any suggestion to help how to judge whether the exclusion is not a hardware problem? or is it related to the software OS?
Use USB 2.0 flash to plug can be recognized normally.

If use the USB 3.0 flash to plug it is easier to see that the device cannot be found.

thanks

Kevin

Hi Kevin,

The TUSB80xx hubs have no known issues with Android systems, this seems implementation specific.

Is the problem only with USB 3.0?  Can you confirm that the power provided to the USB 3.0 flash drives is not dropping below 5V when the devices are enumerating?  USB 3.0 device can consume over 1A during enumeration.

Regards,

JMMN

Hi JMMN,

Ok, I will ask the customer to confirm. Is the power provided USB 3.0 flash drive lower than 5V.

Use USB 2.0 flash to plug can be recognized normally..
It’s all happening in USB3.0 flash driver, tried  many brands, have Transcend, Kingston...etc.

thanks

Kevin

Hi Kevin,

Do you have any more information about the connection fail?

Port related?

Errors reported to the host?

What does the host look like for a good connection / bad connection?

Can you send a schematic?

Regards,

JMMN

Hi JMMN

Ok, I will try more information about the customer side, please wait a moment.

thanks

Kevin

HI Kevin,

I am closing the thread until the customer has a response.  Just post to reopen it.

Thanks,

JMMN

Hi JMMN,

Again more information,
1. Using CPU Qualcomm SDM450
     OS: Android 7.0
2. The USB 3.0 (including 2.0) host signal from the CPU to TI TUSB8041
  hub has 4 port USB 3.0 (including 2.0) port.
3. Symptom: Using USB1.1 & USB 2.0 flash is normal can to know the device.
    But using USB 3.0 flash, it is can not be found (Transcend 16GB, Kinston 16G, Sandisk 32GB)
  Plugging again sometimes can found or that are sometimes not found.
4. Power: 5V, confirmed, in plugging and unplugging is stable and no power down.
5. Please check the schematic diagram, or sent the complete schematic diagram to your reference.
6. If the hardware does not see the problem, is it a software problem? Or what is the situation?

thanks

Kevin

Hi Kevin,

Can you confirm if the hub remains connected to the host at both USB 2.0 and USB 3.0 speeds?  I just want to confirm the issue is with the connection from the hub to the devices.

Regards,

JMMN

Hi JMMN,

Please receive the message complete schematic.

Architecture diagram as show,

The client software RD found that the USB does not enumerate the log. Is the USB hub not sending the interrupt signal to the host?
How do you know that when the USB device is plugged in, there is indeed the signal is sent to the host?

Which signal is to be measured?

Is the schematic correct? 

Thanks

Kevin.

HI Kevin,

Does the USB 3.0 device problem happen on Port 1 as well?  The switch used on Ports 2 and 3 may be causing the connection issues, can you try hardwiring to work for one Type-C orientation and testing it?

Regards,

JMMN

Hi JMMN

I mean is USB 3.0 device problem happen on Port 1,2 & 3

They are all using USB 3.0 speed.

Thanks

Kevin

Hi Kevin,

Can the customer confirm that the 5V to the downstream devices does not drooop below 5V when the devices are attached?

Confirm that the 1.1V and 3.3V rails to the hub do not droop when USB 3.0 is enabled - there is a current jump

If all voltages are solid, there may be a routing issue that is impacting signal quality.  Can you share the layout over private message?

Regards,

JMMN

Hi JMMN,

I will re-check power rail form customer then reply to you, thanks

Kevin