November 1, 2011

Teardown: 4 Port USB Hub

Filed under: Uncategorized — engineeringtopics @ 4:26 am

This is a round USB hub that just broke after modest abuse. At the 11 o’clock position is the USB connection to the PC, and external 2.5W 5V supply connects at 1 o’clock, and then the 4 ports are at the bottom. Not much to this. You can see a 12 MHz xtal, and on the right is likely an 3.3V LDO for the USB part


Up a little closer you can see the 3.3V market. The part to the left is probably a PTC device.

The USB part is a Genesys Logic GL850G. This is pretty much self contained. And for the few years I had it, compatibility was never an issue.

Heading out to each port, you see (from left to right) a cap, another cap, a 15K resistor, an inductor, another 15K resistor, and a 0 ohm jumper. Above is an LED.

Now you know how hubs can be so cheap.


Leave a Comment »

No comments yet.

RSS feed for comments on this post. TrackBack URI

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Create a free website or blog at

%d bloggers like this: