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  1. #1

    Join Date
    Apr 2019
    Posts
    5

    How much current from Kflop I/O?

    good day,
    my need is to configure Kflop/JP6/IO26-35 as output. Anyone know how much current each pin can drive?

    thanks

  2. #2
    Junior Member
    Join Date
    May 2006
    Posts
    3499

    Re: How much current from Kflop I/O?

    Hi geppo_it,

    KFLOP IO can source/sink 16ma. But the first 8 of 10 IO on JP6 (and JP4) have 150ohm pull down termination resistors which uses most of the source current. So IO 34 and 35 can source/sink 16ma and the rest can sink 16ma but only source ~1ma.

    HTH
    TK
    http://dynomotion.com

  3. #3

    Join Date
    Apr 2019
    Posts
    5

    Re: How much current from Kflop I/O?

    Hi Tom,

    how can I use IO 26-33 then? Do I need a buffer to drive an optocoupler?

    tks

  4. #4
    Junior Member
    Join Date
    May 2006
    Posts
    3499

    Re: How much current from Kflop I/O?

    Hi geppo_it,

    What are the specs on the optocoupler? You might connect the Optocoupler + series resistor to 3.3V and have KFLOP sink to GND to turn it on. When the KFLOP output goes high it should go to at least 2.4V which means the optocoupler should see 3.3V - 2.4V = 0.9V and should turn off.
    TK
    http://dynomotion.com

  5. #5

    Join Date
    Apr 2019
    Posts
    5

    Re: How much current from Kflop I/O?

    Tom,

    do you mean a connection as in the attached figure?

  6. #6
    Junior Member
    Join Date
    May 2006
    Posts
    3499

    Re: How much current from Kflop I/O?

    Hi geppo_it,

    Correct. But by the way internal to KFLOP there is another transitor that will sink to ground when the output is driven low.
    TK
    http://dynomotion.com

  7. #7

    Join Date
    Apr 2019
    Posts
    5

    Re: How much current from Kflop I/O?

    thanks Tom,

    as always you are helpful. I haven't chosen the optocoupler yet ... any advice?

  8. #8

    Join Date
    Apr 2019
    Posts
    5

    Re: How much current from Kflop I/O?

    I forgot... i want drive a 24Vcc mini relay (Omron G2RV series)

  9. #9
    Junior Member
    Join Date
    May 2006
    Posts
    3499

    Re: How much current from Kflop I/O?

    I think the G2RV says it requires 13ma which would be hard to find an opto to drive that directly.

    Our Konnect uses a LTV-847S with a transistor follower:



    (the resistor would not be needed in your case)
    TK
    http://dynomotion.com

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