# 7-port USB 2.0 hub design review

Source: https://forum.modalai.com/topic/5382/7-port-usb-2.0-hub-design-review
Category: Design Reviews and 3D Models (https://forum.modalai.com/category/39/design-reviews-and-3d-models)
Tags: pcb-review
Posted: 2026-08-17 08:23:36 UTC by saegsali
Replies: 1 · Views: 154

## saegsali · 2026-08-17 08:23:36 UTC

Hi ModalAI team,

We are planning a 7-port USB 2.0 hub for VOXL 2, connected through J3, using the Microchip USB2517. We wanted to use this to connect more sensors and USB cameras to the VOXL 2 board.

I’m following the USB expansion guidance in the VOXL 2 Expansion Design Guide and wanted to ask:
- Do you have a reference schematic for a USB 2.0 hub connected to J3 that you could share?
- The guide mentions that ModalAI may review customer expansion-board designs. Once I have my schematic ready, would you be willing to review it before I proceed to PCB layout?

Thank you in advance!

## Reply by Vinny (ModalAI staff) · 2026-08-31 18:19:40 UTC

Hi @saegsali 
yes, I can help with this. Sorry for the delay in responding here...
I will email you to enable the schematic transfer and review setup.
For your schematic, these items will ensure a speedy and seamless review:
- Searchable PDF
- All items annotated and page numbers correct
- Off page references if multi-page
- Caps and R's should have their ratings visible (voltages, power, values)
- A simple block diagram to help me understand what you are trying to do.

Thanks!