TUSB4020BI: Using Upstream Power for Downstream Ports with TUSB4020BI:

Hello Brian,

Thank you for the reply. Can I use this IC without programming for just simple low rate data application with defult registers or  should I program this IC from  USB upstream port?

Best regards,

Khosro

Hi Brian,

Then I don't need to program it in this case right?

Hello Brian,

Would you please provide me layout files for the TUSB4020BPHP Evaluation Module?

Best regards,

Khosro

I only have TUSB4041  EVM file, do you still need?

Best

brian

Yes thank you, I can get some idea to place the components.

Best regards,

Khosro

Please accept my friendship request.

Best

brian

Hi Brian,

I just marked my unread notification, how can I accept friendship request?

And is it possible to provide 3.3V regarding Pin.9 (USB_VBUS)? And in this case what is recommended value for R7 and R8? 

EP-ELN-00364-70-Hub.pdf

EP-ELN-00364-70-Hub.pdf

Subject: Review Request for BUS_POWERED HUB Schematic

Hi Brian,

I have sent you the schematic for my BUS_POWERED HUB, which is designed for a simple low-speed application without a charging option. The main purpose of this hub is to transmit and receive low-speed signals.

Could you please review the schematic and provide feedback? I also have a few specific questions:

1. 3.3V Supply from Pin 9 (USB_VBUS):

   • Is it possible to connect 3.3V to USB_VBUS (Pin 9)?
   • If so, what are the recommended values for resistors R7 and R8?

2. 5V Supply after Rectifier Diodes:

   • Is it acceptable to supply 5V to Pin 9 after the rectifier diodes?
   • What voltage tolerance should this 5V supply have to ensure proper operation?

3. Placement of FL1 (Connected to Pins 26 and 27):

   • Should FL1 be placed where it is currently connected, or would it be better to position it on the input side of the isolator (ISOUSB111DWR)?

4. Capacitor Optimization:

   • Could you specify any unnecessary capacitors in the schematic to achieve a more optimal design?

Thank you for your assistance in reviewing the schematic and addressing these questions.

Best regards,

Khosro Lotfi said:

And is it possible to provide 3.3V regarding Pin.9 (USB_VBUS)? And in this case what is recommended value for R7 and R8? 

for 3.3v, divider can be 50k/10k. to get 0.5v on pin 9.

Khosro Lotfi said:

5V Supply after Rectifier Diodes:

• Is it acceptable to supply 5V to Pin 9 after the rectifier diodes?

pin 9 should be 0.5v

Khosro Lotfi said:

Placement of FL1 (Connected to Pins 26 and 27)

current location looks good.

Khosro Lotfi said:

Could you specify any unnecessary capacitors in the schematic to achieve a more optimal design?

I don't think 1nf caps are needed for 3.3v and 1.1v supply.

  I'm working on review schematic  and will be completed by tomorrow.

Best

brian

Thank you Brian :-)

If I use the HUB controller with the default register, you mentioned that it supports low-speed data transfer. Do you mean 1.5 Mbps or 12 Mbps?

It should support both 1.5Mbps and 12Mbps.

Best

brian

Here is schematic review result.

interwell_tusb4020B_sch_review.pdf

Best

brian

Hi Brian,

Thank you for reviewing my schematic, would you please send me the PCB? for sending the PCB, how can I accept your friendship request?

Sincerely,

Khosro

You  should receive email about accept friendship request.

Best

Brian

You are ok to send message , I say Hi to you with private  message.

Best

Brian

Hello Brian,

I have tried to open .BRD file in Altium 24, but I could not unfortunately open it. If you have already cadence or similar softeare, could you please convert it and send it to me?

Best regards,

Khosro

Hi Khosro:

    Let me try and see if it works.

Best

Brian

sorry, don't understand what's the meaning of your reply.

Best

Brian

Dear Brian,

I hope you're doing well.

Thank you for sending over the two sample files for the TUSB4041 EVM to help me with component placement on the PCB. However, I noticed that the file format is in .brd, which I am unable to open in Altium Designer 24.

Could you kindly convert the files to a .PCB format or another format that is compatible with Altium? It would be a great help for me to proceed with the design.

Apologies for any confusion, and thank you in advance for your assistance!

Hi Khosro:

    I'm on business travel and  will be back to office after 9/28. I  will  try to convert the files after I'm back to office.

Best

Brian