TUSB1044: Please review the schematic, and have some questions.

Chase

Looking at the schematic,

1. Having Type-C receptacle on both ends is not being supported by the USB Type-C spec, you want to have a USB Type-C plug on one side and a USB Type-C receptacle on the other end.

2. There is a TUSB321AI connected to the USB3.1 Type-C Connector (HOST-Side), but TUSB321AI port is configured as DFP. If connecting to a PC, you want TUSB321AI to be UFP.

3. Who is controlling the TUSB1044 FLIP pin? I can't see it from the schematic

4. TUSB216 D1P needs to be shorted to D2P, and D1M to D2M, I don't see this from the schematic.

For the questions

TUSB1044 does not have a pin to indicate connect/disconnect event. The connect/disconnect event is handled by the CC or the PD controller. 

It also does not have a reset pin. But you can disable TUSB1044 by driving CTL0/1 to '00' state.

Thanks

David

Dear David,

Thank you for your support. and here is another question from my customer.

- my customer wants to use SCL1/CD pin of TUSB216 as connected signal like below;

: if SCL1/CD is high, USB2.0 is connected.

if SCL1/CD is low. USB2.0 is disconnected and USB3.0 is connected.

-> finally my customer wants to see SCL1/CD signal to monitor TUSB1044 is connected properly or not. (if SCL1/CD is low, TUSB1044 is working properly as USB3.0 speed.)

Please give me your opinion about it. Thanks.

Best regards,

Chase

Chase

SCL1/CD being low could also mean no USB device is being connected. TUSB1044 does not have a USB3 status pin like TUSB216.

Thanks

David

Dear David,

Thank you for your support.

You mean that SCL1/CD signal low does not mean USB3.0 connection?

cause we thought that USB is connected between host and target, and SCL1/CD is low, it means that it is not connected to USB2.0 (alternatively can say that it is connected as USB3.0)

please confirm it once again. Thanks.

best regards,

Chase

Chase

The CD pin gets asserted from an unconnected state upon detection of DP or DM pull-up resistor and gets de-asserted upon detection of disconnect. So CD pin goes low when the device is in USB3 state or disconnect state.

Thanks
David

Dear David,

Thank you for your support.

Here is another question.

As a result, my customer drew their schematic based on TUSB542EVM, and they just changed TUSB542 to TUSB1044. (and changed USB A to type C)

I think it will be working as USB3.1, just give some advice about it.

Best regards,

Chase

Chase

In this case, they should use TUSB522P for 5G or TUSB1002A for 10G.

Thanks

David

Dear David,

Thank you for your support.

Actually my customer needs 2 type C connector, that's why they decided to use TUSB1044 because its EVM has 2 USB type C connector.

(I checked that TUSB522P has 2 USB A connector, and TUSB1002A has 1 type A connector and 1 type C connector.)

please check this issue. Thanks.

Best regards,

Chase

Chase

Do you have a block diagram you can share? The TUSB1044EVM has one Type-C plug and one Type-C receptacle. I am trying to understand exactly what the customer requirement is.

Thanks

David