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TSS721A: MBUS and TSS721A

GARETH OU
Guru 12185 points

Part Number: TSS721A
Other Parts Discussed in Thread: TSS521

Hi

The customer wants to make a circuit from RS232 (422,485) to MBUS Master, can you provide relevant technical information first (there is already a TSS721A spec), is there a reference schematic?

  • 0
    TI__Guru 74492 points

    Gareth,

    We don't have an exact reference design for this. I've notified engineers who can help address this question, please allow some time as it is a holiday week in the US.

    Regards,

    Eric Hackett 

  • 0
    TI__Mastermind 26836 points

    Gareth,

    Unfortunately the TSS721A and TSS521 serve as meter-bus slave devices. These are the only MBUS solutions that TI offers.

    We do have a reference design (TIDM-FRAM-WATERMETER) that shows this operating as a slave device, but we wouldn't have anything prepared that exhibits bridging between MBUS and RS-232/RS-485.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    Guru 12185 points

    Hi Danny

    The customer wants to convert the MBUS from the system via RS232 or 485 via TSS721, is this OK?

    Please also provide assistance in providing similar application schematic

    Thanks

  • 0 in reply to GARETH OU
    TI__Mastermind 26836 points

    Gareth,

    Sorry if there was any confusion from our prior posts, but unfortunately we don't have any application schematic for this type of use case with RS-xxx.

    There are some typical application diagrams in the TSS721A data sheet that show how it can interact with a microcontroller. From your drawing, I don't see why an RS-232 or similar transceiver would be needed here. Additionally, you'd need to keep in mind that RS-232 is a full-duplex communication protocol, while the TSS721A operates as a half-duplex device.

    Best,

    Danny