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TRS3122E: UART to RS232

Roy Chou1
Genius 17350 points

Part Number: TRS3122E

Hi Team,

Is the TRS3122E correct socket to achieve UART to RS232?

Do we have one channel socket can be promoted?

Regards,

Roy

  • 0
    Guru 322780 points

    The search function shows that there are indeed 1+1 transceivers:
    ti.com/interface/rs-232/products.html#286=1;1
    (The SNxxx devices are old; the MAXxxx and TRSxxx devices are identical.)

    What supply voltage, data rate, and ESD protection do you need?

  • 0
    TI__Guru 54042 points

    Hi Roy,

    The most common application using 1 channel RS-232 is UART - so the TRS3122E can be used to to convert between UART and RS-232 as long as your application needs fit into the performance range of the TRS3122E

    A couple notes to help with determining if this is the right part:

    1. The TRS3122E can be supplied by a voltage supply of 1.65V to 5.5V; ac integrated charge pump (needs external capacitors) will generate the output swing voltages for RS-232. Generally you would pick a supply that matches the controller connected to the transceiver - this is a wide VCC RS-232 device though so it covers most controllers in the 1.65V to 5.5V range. 

    2. A 1Mbps data rate can be achieved  with a capacitive loading of 500pF and 500kbps can be achieved with a capacitive loading of 1000pF - above that and the data rate could suffer. In general most of the capacitive loading is from the cabling - it is generally assumed  that RS-232 cabling is usually about 167pF/m (but check your specific cabling datasheet for more information). So essentially 1000pF would be about ~6m bus using common RS-232 cabling. So depending on data rate and max bus length (+ cable properties) needed in the application will help determine if this is the best part. 

    So if you could confirm the following for me I can also verify if this is our best part for your specific application:

    1. What is the voltage supply needed? 

    2. What is the bus length for the RS-232 portion

    3. If using cabling - do you have a part number so I can look up the datasheet? 

    4. What data rate will the UART be running at? 

    Generally speaking many UART applications are handled just fine by RS-232 - but I would like to verify the above information to see if this is the best part for this specific application. 

    Best,

    Parker Dodson