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TUSB2077A: Making a multi port USB HUB, almost 28 channels

amirhossein shahshahani
Prodigy 150 points
Part Number: TUSB2077A
Other Parts Discussed in Thread: TUSB4041I, TUSB2046B

Hello,

We are planning to connect multi MCUs through Micro USB to a computer. We have tried on existing USB hub devices in the market (24 channel) and it works fine. Now, we have to design our HUB, with almost 28 USBs. I am wondering if we can make it by a 1:4 downstream USB hub (like TUSB2046) and then connect each output to the input of TUSB2077A USB hub, to make a 4*7=28 down-streamed USBs.

Our MCUs only transfer some KByte data, as USBUART transfer and receive data. They are not transmitting continuously but are plugged and unplugged many times (maybe twice a day) to download the data and charge the battery. We need the USB power less than 100mA for each USB port. So, in general, need a bigger power supply to support 28*100 mA.

I do appreciate your suggestions for IC selection and design guidelines (there are some 1:4 ICs). And, do I need to have an EEPROM memory or any serial configuration for our design?

Thank you

  • 0
    TI__Guru 64326 points

    Amirhossein,

    TUSB2046B and TUSB2077A sound like a good selection for your application. You should consider creating a self-powered hub design to in order to power the down stream ports appropriately. You can use an EEPROM in order to change the Vendor ID and Product ID with TUSB20XX. EEPROM can be used to configure attributes of down stream ports using TUSB40XX devices, if this is a desired function. Using TUSB40XX (i.e. TUSB4041I) would require more devices to achieve the same number of ports.