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THVD4411: The garbled code problem of the chip

Tonyx.wu
Genius 4285 points
Part Number: THVD4411


485 garbled characters. Check if there is something wrong with the mode. TERM_TX, TERM_RX, and SLR are all pulled low

Could you please help take a look at what the problem is and how to solve it

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  • 0
    TI__Genius 16502 points

    Hi Tony,

    Can you provide share a waveform of the RS-485 signal by probing the bus pins with an oscope?

    Based on the weird characters, it is possible that significant noise is present on the bus. Your MODE0 and MODE1 signals are pulled up by default which means the transceiver will be in RS-485 full duplex mode by default.

    How long is your cabling? How many other RS-485 nodes are present? What data rate are you operating at?

    I noticed you do not have termination present on the RS-485 bus pins. You can reference this termination guide: https://www.ti.com/document-viewer/lit/html/SSZTB23 

    Best,

    Ethan