engineeringtopics

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.

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