Linux/TUSB320: TUSB320: OTG Configuration

Mrudang Shelat80

Intellectual 630 points

Part Number: TUSB320

Tool/software: Linux

Hi,

I am using TUSB320 IC in my design.

Currently, I am facing an issue of auto selection of Mode configuration (Host/Device/Dual).

Please see below schematic for your reference.

Regards,

Mrudang

over 6 years ago

0 Malik Barton57 over 6 years ago

TI__Guru 64326 points

Mrudang,

Could you give more details on your issue? What is being connected to your Type-C port? Having the PORT pin NC defines TUSB320 as a DRP which will select between DFP and UFP automatically.

0 Mrudang Shelat80 over 6 years ago in reply to Malik Barton57

Intellectual 630 points

Hi,

We have set mode DRP by using 0x0a register and PORT pin is already NC, then TUSB320 should be change mode itself but it doesn't changed. even though device is not getting detected.

we need to set DFP and UFP more explicitly using i2c to make it work as per configuration

Regards,
Mrudang

0 Malik Barton57 over 6 years ago in reply to Mrudang Shelat80

TI__Guru 64326 points

Mrudang,

What is the device you are connecting? Can you provide a simple block diagram of your test? How do you determine that TUSB320 has changed modes? If you are looking at MODE_SELECT to determine how TUSB320 has configured itself, this is incorrect. MODE_SELECT will report value programmed. Can you monitor voltage of CC lines during your test?

0 Mrudang Shelat80 over 6 years ago in reply to Malik Barton57

Intellectual 630 points

Hi Malik,

Thanks for the response.

We will get back to you on your queries on MODE_SELECT .

Please see attached image for block diagram. TUSB320 is interfacing with i.MX6D.

0 Malik Barton57 over 6 years ago in reply to Mrudang Shelat80

TI__Guru 64326 points

Mrudang,

Thank you for the diagram. I will await your reply.

0 Mrudang Shelat80 over 6 years ago in reply to Mrudang Shelat80

Intellectual 630 points

Hi,

Any update based on diagram?

0 Malik Barton57 over 6 years ago in reply to Mrudang Shelat80

TI__Guru 64326 points

Hi,

Diagram looks good but no update based on this, need more details to narrow down issue.

0 Malik Barton57 over 6 years ago in reply to Malik Barton57

TI__Guru 64326 points

Hi,

Is there any more support needed for this issue? If so please reply with any relevant details so that I can further assist you. For now I will be marking this thread as "TI Thinks Resolved". If you have resolved your issue, please post the solution to the original problem/post for others with similar issues.

0 Mrudang Shelat80 over 6 years ago in reply to Malik Barton57

Intellectual 630 points

Hi Malik,

I have traced CC1 pin voltage as below.

Table-7, CSR Registers Bit Address and Description
Rgister Address: 0x0A

DRP Mode: bits[5:4]: 11
Host: 0V
Device: 0V
Not connected: 0V

DFP Mode: bits[5:4]: 10
Host: 0V
Device: 4.5V
Not connected: 0V

Let me know your view.

Regards,
Mrudang

0 Mrudang Shelat80 over 6 years ago in reply to Mrudang Shelat80

Intellectual 630 points

Hi,

Any updates on the data which I shared?

Regards,

Mrudang

0 Mrudang Shelat80 over 6 years ago in reply to Malik Barton57

Intellectual 630 points

Hi,

I have traced CC1 pin voltage as below.

Table-7, CSR Registers Bit Address and Description
Rgister Address: 0x0A

DRP Mode: bits[5:4]: 11
Host: 0V
Device: 0V
Not connected: 0V

DFP Mode: bits[5:4]: 10
Host: 0V
Device: 4.5V
Not connected: 0V

Let me know your view.

Regards,

Mrudang

0 Malik Barton57 over 6 years ago in reply to Mrudang Shelat80

TI__Guru 64326 points

Hi Mrudang,

Sorry for the late reply. Is it possible for you to provide a waveform of the data provided? Whats are you plugging into your DRP device during this test? In the data provided above what pin are you probing? This would help as the data provided is very limited.

0 Mrudang Shelat80 over 6 years ago in reply to Malik Barton57

Intellectual 630 points

Hi,

We are not able to get waveform as we are getting High and Low only as per previous data shared with you.
We are plugging our Linux PC as a Host and our board as a device. And another stage we are keeping our board as a host and external USB device as a device.
We are probing on CC1 pin as you instructed earlier.

Our query is while keeping in DRP mode we are not getting any detection of either as a host or a device.

Regards,

Mrudang

0 Malik Barton57 over 6 years ago in reply to Mrudang Shelat80

TI__Guru 64326 points

Hi Mrudang,

Is Vbus present when testing the device?

0 Mrudang Shelat80 over 6 years ago in reply to Malik Barton57

Intellectual 630 points

Hi,

We will check and let you know.

0 Malik Barton57 over 6 years ago in reply to Mrudang Shelat80

TI__Guru 64326 points

Hi,

I will wait for your reply.

0 Brian Zhou over 6 years ago in reply to Malik Barton57

TI__Guru*** 146535 points

any update?

0 Mrudang Shelat80 over 6 years ago in reply to Brian Zhou

Intellectual 630 points

HI Malik,

Thanks for the patience.

I have checked the VBUS voltage 5V. Currently my board is in DRP mode but we do not see any HST or device related info for our device. And our device is also able to charge my other device board as well.

Provide your view.

0 Malik Barton57 over 6 years ago in reply to Mrudang Shelat80

TI__Guru 64326 points

Hi,

To clarify, your device is not able to complete role detection when connected to a USB Host or USB Device correct? Is it possible that TUSB320 is not properly enabled during test, meaning that EN_N is not meeting the following criteria below? Is the external control signal behaving as excepted?

"If controlled externally, must be held high at least for 50 ms after VDD has reached its valid voltage level."

0 Mrudang Shelat80 over 6 years ago in reply to Malik Barton57

Intellectual 630 points

Hi Malik,

Thanks for your quick support.

It looks like we are able to solve it and able to detect as a HOST or Device.

As per datasheet, I have considered below reference design.

And Our design has R447 on EN_n pin of switch, which was creating this issue. I have removed it and our problem got resolved. Please see below our schematic.

Kindly let me know if my understanding is wrong.

Awaiting for your response.

Thanks once again.

Regards,

Mrudang

0 Malik Barton57 over 6 years ago in reply to Mrudang Shelat80

TI__Guru 64326 points

Hi Mrudang,

Without seeing the rest of the schematic i can not confirm this solution but if the issue is resolved by removing the resistor this is some progress. Could you probe USB_OTG_PWR_EN and USB_OTG_EN during your testing?

0 Mrudang Shelat80 over 6 years ago in reply to Malik Barton57

Intellectual 630 points

Hi Malik,

Removing R447 helps me to get the expected result of TUSB320.

Thanks for your support and guidance.

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Linux/TUSB320: TUSB320: OTG Configuration