2013-8-23 10:12 6885 1 11 分类: PCB 文集: DIY

I have bought USB hubs from different shops. If the brands of the hubs are not popular or well-known, the quality may not be good enough.

1. The conductivity of the cables may not be high enough to drive bus-powered hard disks
2. The hub could not be powered externally.
3. In some cases, the hub could be like the one I bought from Taobao:

Fig. "Hi, I am a USB 2.0 Hi-speed Hub!"

Fig. "Ha, I have no 'heart'!"

The above hub does not have any hub controller IC. With connecting all D- and D+, the only use is to share power... Oh no!

So, to avoid buying bad quality hubs, we could design and make our own ones!

This is an Altium PCB project for a USB2.0 Hi-speed hub. What not USB3.0? The reason is that the controller and sockets are much more expensive than 2.0, and for daily use, USB2.0 is fast enough

For saving cost and reduced size, GL520G with SSOP28 package has been chosen.
However, some functions like Individual power mode and even power enable function are NOT available in this package.
If we are going to design a more advanced hub, GL850G in LQFP48 would be a better choice.

schematic prints.jpg
Fig. The schematic of the GL850G USB Hub

The PCB was a 2-layer board which was drawn in a semi-circular shape...

Fig. The Hub's PCB layout

Fig. The completed product with the GL850G hub controller

Fig. Using ChipGenius, the information of the controller could be obtained

There were several special features:
1. Can be powered externally by 5V power supply (5.5x2.1 Connector)
2. All solid state capacitors
3. LED indicator (power and standby)
4. Over-current protection (by PTCC)

3D printer was used to print out a plastic casing for the hub.
(For testing, a very thin casing, only one layer, was made)


Fig. With 3D printer printed casing

External supply was needed when plugging in some high-current devices (like charging cellphones and hard disks) to the hub.

Fig. A 5V 2A power supply with 5.5x2.1 Jack

Of course there is room for improvement in the design :D
But for my own use, it is good enough :D

Attachment: Alitum project for the hub


文章评论 10条评论)


billzhu_345737527 2016-2-16 14:38


mariohk321_586285434 2013-8-27 21:52


mariohk321_586285434 2013-8-27 21:49


tritek 2013-8-24 13:45


billzhu_345737527 2013-8-24 09:01

3D打印机? 打印外壳?!!!!! 这才是亮点

mariohk321_586285434 2013-8-23 19:51


1031768836_515249346 2013-8-23 10:35


mariohk321_586285434 2013-8-21 23:14


chen_zs2012_704941858 2013-8-20 23:54

qindaodz_720978399 2013-8-20 17:02

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