TUSB211RPTREVM: schematic and PCB layout for TUSB211RPTREVM

Hi Nick,

Please accept my E2E friend request, and I can send those files over.

Thanks,

Ryan

Thanks Ryan. I got it. 
I have a few questions about the schematic.
1. Since TUSB211A can operate from 2.3V - 6.5V. Do you see any problem if TUSB211A is powered directly from Vbus (5V) instead of Vcc (3.3V) from the LDO (U2)?
2. We have a separate 3.3V on our board, will it affect TUSB211A functionality if we use it instead of the 3.3V from LDO U2 (source from Vbus). IF we use the separate 3.3V, the Redriver IC will be powered even though the host USB cable is not connected.
3. CD and ENA_HS are output pins. Each of them connected to a switch that has options to connect to VCC, NC, and GND. If the switches are switched to GND, those 2 output signals will be directly shorted to GND. Will those output pins be damaged. What is the purpose for that option?

The next 2 questions are about the data sheet of TUSB211A. Please let me know if I should create a new ticket for this.
4. The data sheet of TUSB211A states the pin type of ENA_HS can be both input and output (I/O) on page 3. I thought it is output only. Is this a typo? 
5. On page 5, session OUTPUTS CD, ENA_HS, it shows only the minimum value of the outputs. What are the typical and the maximum values of CD and ENA_HS? 

Hi Nick,

Nick Nguyen said:

1. Since TUSB211A can operate from 2.3V - 6.5V. Do you see any problem if TUSB211A is powered directly from Vbus (5V) instead of Vcc (3.3V) from the LDO (U2)?

Yes, you can power the TUSB211A from VBUS. You would just need to ensure that the TUSB211A is powered before the USB2 HS handshake takes place.

Nick Nguyen said:

2. We have a separate 3.3V on our board, will it affect TUSB211A functionality if we use it instead of the 3.3V from LDO U2 (source from Vbus). IF we use the separate 3.3V, the Redriver IC will be powered even though the host USB cable is not connected.

Using a separate 3.3V won't affect it. It may be better if powered separately, as this would ensure that the redriver is powered before the USB2 HS handshake takes place.

Nick Nguyen said:

3. CD and ENA_HS are output pins. Each of them connected to a switch that has options to connect to VCC, NC, and GND. If the switches are switched to GND, those 2 output signals will be directly shorted to GND. Will those output pins be damaged. What is the purpose for that option?

The switch for these pins really isn't necessary. Shorting them to ground won't have any effect. NC is the default setting to set it to where the LED of the EVM follows the output of these pins.

For CD and ENA_HS in a typical design, you can either leave these pins floating, or can connected to a test point for debug if needed.

Nick Nguyen said:

4. The data sheet of TUSB211A states the pin type of ENA_HS can be both input and output (I/O) on page 3. I thought it is output only. Is this a typo? 

This is leftover from the TUSB216, which uses the ENA_HS pin as an input on start-up. It purely acts as an output for the TUSB211A. Thanks for highlighting.

Nick Nguyen said:

5. On page 5, session OUTPUTS CD, ENA_HS, it shows only the minimum value of the outputs. What are the typical and the maximum values of CD and ENA_HS? 

We don't have a typical for these pins. The max should be 3.6V, though in my own testing I see it normally between 2.5 and 3V.

Thanks,

Ryan

In the data sheet, Resistor value (REQ_LVL2) is said between 3.4K and 3.96K Ohms. However, on the dev board, it's 4K Ohm. Should it still recognize EQ level 2 even though the resistor value is out of spec?

Hi Nick,

I believe it should still work, however I would recommend sticking to the values listed in the datasheet.

The device that was originally on this EVM, the TUSB211, had 4KOhm in the datasheet, hence it being used here.

Thanks,

Ryan