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Digital outputs for PLC applications

Patrick Ruf
Genius 5055 points

Other Parts Discussed in Thread: SN65HVS885

Hi,

TI has integrated solutions for Programmable Logic Controller digital inputs (SN65HVS885) and for analog inputs/outputs. Do you have plans to offer integrated solutions for digital outputs as well?

Thanks and best regards,

Patrick

  • 0
    TI__Mastermind 21992 points

    Hi Patrick,

    I will check with the team and get back to you. I know this project has been on our backlog for a little while now but I do not know the current status of it. Unfortunately it is not something I have been working on.

    Thanks,

    John

  • 0 in reply to John Griffith
    TI__Mastermind 21992 points

    Hi Patrick,

    I just found out who will be responsible for the new development and have reached out to the team and asked them to follow up with you on this thread.

    Thank you for your patience,

    John

  • 0
    TI__Mastermind 21805 points

    Hi Patrick,

    I'm Matt from the Motor Driver team!

    Presently, we have devices such as the 4-channel DRV8844 (4x 1/2-H bridges) or the 4-channel DRV8803 (4x low-side drivers), and several others that can drive a 24 V output.

    What are the requirements for this digital output?

    1. Number of channels
    2. Current drive
    3. Device interface
    4. System protection features

    --Matt

  • 0 in reply to Matt Hein
    Genius 5055 points

    Hi Matt,

    Thanks for the reply.

    The requirements (wishes) would be as follow:

    - Push Pull Outputs or just high side power switch
    - 8 Channel
    - SPI interface or 8 digital inputs (3.3V and 5V tolerant)
    - Nominal 24V supply with a range 18V...36V
    - Overcurrent/Overtemperature protection
    - Short circuit protected
    - ESD protected
    - 0.5A current drive
    - Switching times in the range of 20...100us

    Just like the SN65HV885 but for general purpose digital outputs. Except for the push-pull outputs the ISOFACE device familiy from infineon would probably be the closest match today (galvanic isolation included).

    Best regards,
    Patrick

  • 0 in reply to Patrick Ruf
    TI__Prodigy 575 points

    Hi Patrick,

    I'm on the marketing side of the motor driver team in TI. As Matt suggested earlier we have a 4-channel push-pull structure device, DRV8844. It operates over a wide range of 8 to 60V. I understand that the board space of a PLC digital output module is usually pretty tight, so a small RDSON of the output stage and a thermal efficient package become very important for as little thermal dissipation as possible - and these are things you can find in DRV8844.

    By the way, have you considered low-side drivers if your DO switching speed is not very high? TI has a 8-channel low-side driver with a SPI interface which greatly reduces board space and system complexity. The part number is DRV8860, which we have designed-in in a couple of PLC customers.

    I hope this helps and let us know if you need further assistance. Thanks.

    BR,

    Zhao