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LAUNCHXL-F28069M: Interface differential encoder

James Lockridge19
Genius 14487 points

Part Number: LAUNCHXL-F28069M
Other Parts Discussed in Thread: LVSERVOMTR

Hello,

I want to use a motor with a differential encoder with the F28069M LaunchPad. I have heard that differential encoders reduce noise coupling from PWM switching, so it would be more robust for my project. Can the F28069M LaunchPad accept a differential encoder? What modifications would I need to make?

  • 0
    TI__Mastermind 45606 points

    Hi James,

    The F28069M and its LaunchPad have no way of receiving differential signals (other than the USB peripheral I suppose). You would need an external receiver device to convert the differential signal back to single-ended. Do you have a PN for the motor with the differential encoder by chance? Curious to look at its output.

    The LAUNCHXL-F28069M does have two incremental encoder interfaces / headers (5V translated on board) for the device's QEP_A and QEP_B modules. However it expects single-ended inputs.

    Best,

    Kevin

  • 0 in reply to Kevin Allen18
    TI__Genius 14487 points

    Hi Kevin,

    It's a similar Teknic motor like the one used for LVSERVOMTR, but the orderable has a -D on the end instead of -K for the differential encoder.

  • 0 in reply to James Lockridge19
    TI__Genius 14487 points

    Hi Kevin,

    Thanks for your help offline. I wanted to post your response here to close the E2E thread for you.

    I think it would help you to look at the BOOSTXL-POSMGR EVM, which has on-board RS-485/422 differential transceivers. If the voltage levels from the motor’s encoder match those devices the board should be able to be used.

    Differential devices will greatly improve noise immunity and wire distance capability. Would suggest reaching out to the RS-485/422 interface team for additional details if needed.