TUSB214-Q1: Please review the schematic, and have some question.

Hi Chase,

Schematic looks good.

1. Please double-check that the test fixture is connected to TUSB214-Q1 before enable the source to send the TEST_PACKET. You can refer to the test procedure from the app note (High Speed Signal Quality Test Modes - SLLA593). It might be helpful to see testing section on this app note (TUSB2XX Implementation Guide - SLLA392)

2. In non I2C mode, the SDA pin must be floating or connected to ground. Please see below TUSB214 schematic checklist.

3. Are you asking the wire is pre-channel or post-channel? Please refer to below eye diagram bench setup for the length. 

Best,

Josh

Dear Josh,

Thank you for your support.

for the answer 3, They use teflon wire instead of 2m USB A-B cable.

and Should we use sma to sma cable to check eye diagram?

Best regards,

Chase

Dear Josh,

Thank you for your support.

My customer still cannot check the effect of TUSB214.

Can you guess the reason of not working? What can we do for the next step?

Best regards,

Chase

Dear Josh,

Please let me know if there are any updates about the issue above. Thanks.

Best regards,

Chase

Hi Chase,

I apologize I didn't know your question was posted and missed the response.

Please below the comments of the following customer's question from another thread. Note that it would be appreciated if you could tell the customer to ask any questions on this thread to track the issue.

TUSB214 failed to check operation. --> I want a quick answer

--> ECU to TUSB214 : USB Eye-Pattern test ==> Signal No Change..

Removed Tusb216 from Tusb216 board and used TUSB214 (use TUSB214 VCC: 3.3V)

If the customer followed the test fixture procedure, now we can approach the device internally. Since the eye diagram shows no change even boost level changed, it means the device is not working properly. As the customer said that they placed TUSB214-Q1 on TUSB216 EVM, I would ask if the customer checked the pin compatibility. Note that their operation is not 100% identical. Please refer to this thread regarding the compatibility. Let me know if you have any further questions.

Best,

Josh

Dear Josh,

Thank you for your support.

I checked with my customer yesterday, and we confirmed DC boost and AC boost anyway.

here is my additional question;

in the process of test, we should followed the steps below.

1. check usb communication disabled. (no data on D+ and D-)

1. apply 3.3V to TUSB214. (including reset)

2. enable usb communication.

if we apply 3.3V after USB communication is started, TUSB214 does now work at all. Is it right process?

I am asking it because TUSB216 does not affect the sequence. (applying VDD first or enable USB communication, do not matter.)

Best regards,

Chase