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ISOM8110: Cannot use ISOM8111 in RS485 under 115200bps baud rate

Part Number: ISOM8110
Other Parts Discussed in Thread: ISOM8111, ISOM8710

Tool/software:

Hi Team,

The customer uses ISOM8111 on their RS485 isolation design.

The communication will fail while operating at high-speed baud rate (115200bps).

Please help to check and input your comments.

Thanks. 

  • Please show the schematic.

  • Hello Peter, 

    Thank you for reaching out. The ISOM811x family is an analog style opto-emulator. As a result, it does not have a high data rate when used for digital communications. From previous tests, I would recommend limiting the data through the opto-emulator to less than 100kBps. The ISOM8710 is designed to handle higher speed digital signals (up to 25MHz).

    Otherwise, I would recommend one of TI's isolated RS-485 transceivers (like ISO1452) or digital isolators used with a non-isolated transceiver (ISO7741). 

    Best,
    Andrew