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TUSB1105, TUSB1106

Laura Rodriguez
Prodigy 70 points
Other Parts Discussed in Thread: TUSB1106, TUSB1105, TUSB3410, TUSBWINVCP

I have a device with UART output (TX, RX, RTS, DTS ... etc) and I want to connect to a USB 2.0 interface.

The problem is that my device works at 3.3 V and 5V USB is powered by the HOST.

Can I solve the problem by just putting a TUSB1105, TUSB1106? or I need to place a voltage regulator?

  • 0
    TI__Genius 16200 points

    Laura,

    No you cannot just use a USB Transciver, you need a USB-to-Serial converter device such as TI's TUSB3410.  We have an EVM, TUSB3410UARTPDK, that will enable your serial device to talk to a PC when used with our TUSBWINVCP software solution.

    There are two additional key application notes I would recommend:
    USB/Serial Applications Using TUSB3410 VCP Software
    TUSBWINVCP Customization Guide

    Finally, I would recommend viewing our TUSBWINVCP Implementaion Tips & Tricks Video.

  • 0 in reply to DHarmon
    Prodigy 70 points

    Dear Dan,

     

    Thank you for your quick reply. The thing is that I dont want to use the USB protocol, only the physical interface. The "Host" I had mentioned is not a Pc, is a Gateway.

    I will put in the Gate a USB receptacle, so both of items (receptacle and my plug) can communicate by UART isnt it? In this case I have to use a USB to serial converter?

     

    Thank you very much,

     

    Laura

  • 0 in reply to Laura Rodriguez
    TI__Genius 16200 points

    Laura,

    In your first post, you state "... I want to connect to a USB 2.0 interface" - now it appears you are saying it is NOT a USB interface?  What is the 5V limitation on the USB interface if it is not a true USB interface.  The connectors do not really care what is connected to their pins?

  • 0 in reply to DHarmon
    Prodigy 70 points

    Dan,

    I dont want to stablish the protocol of USB 2.0. I only need the physical interface.(the connector)

    So, the problem is, when I connect the device in the Gateway, the gateway understand the data (UARTS), and the VDD is 3.3V , but if the device is connected to a HOST, my device probably breaks down(VDD>3.3V), thats the reason I need a voltage regulator with a switch. When the VDD is higher than 3.3V, the device will not have to be ON. You understand know my problem?

    It is a difficult way to connect a device, I know, but I need this device only for ONE application, if the user connects the device in other HOST the device will not work.

     

  • 0 in reply to Laura Rodriguez
    TI__Genius 16200 points

    Laura,

    What circuitry is the USB connector "connected" to inside the Gateway.  If it is a standard USB connection then you have no choice but to convert to USB protocol.

    If it is not a standard USB connection, then I do not understand your voltage concerns?

  • 0 in reply to DHarmon
    Prodigy 70 points

    Dan,

    The gateway has a serial port (DB9) connection. I will emove this connector from the board, and I will put a USB receptacle. So, the behaviour is still serial.

     

    My device is the Plug (USB) and if I put a Serial to USB I will have ti put it in the Gate too, and I dont want to do that.


    The problem is when the user put  my device in other equipment, this behaviour can break the device, so I want ti put a restriction.(voltage regulator only, or anything else)

  • 0 in reply to Laura Rodriguez
    TI__Genius 16200 points

    Laura,

    As soon as you put a USB connector on your box, people will assume it is a USB connection and treat it as such.  What do you want to use a USB receptacle, if it is not a USB connection?  This seems like you will just cause end-user confusion and problems as you point out?

  • 0 in reply to DHarmon
    Prodigy 70 points

    You are right, but as you know now, I dont need the circuit to convert Usb to serial. I only want an actual connector.  The thing is how can I connnect it?

  • 0 in reply to Laura Rodriguez
    TI__Genius 16200 points

    I suggest you post yoour question in the power management forum, because a protocol device is not what you need, you need a power management device.

    I would specify very exactly what you are doing - replacing a DB9 connector with a USB receptacle, even though you are not actually talking USB.  I would specify whether it is a USB A type or B type receptacle.  Finally specify what the connection scenarios you are trying to protect against.

    Fundamentally, I'll be honest, I do not understand your need to switch a serial interface from the standard serial connector, DB9, to a USB connector, when you have no plans to communicate via USB.  This does not seem like the best solution to whatever problem you are actually trying to solve.