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DB15 5Volt tolerant?

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chalkhills
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I am making a touchbutton controller for a series of HD1010 interfacing via the DB15 Switch/LED connector. This port is 0/3.3v logic. Does anyone know if the inputs are 5v tolerant - i.e. can I can interface the 8 I/O lines with 5v TTL? I am aware that the lines are internally protected with a 100R series resistance. Thanks in advance.
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    RokuLyndon


    I'm checking on this. I'm not sure.
    Did you look at the gpio section of the hardware manual. It should have enough info to answer this question.
  • 0
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    RokuLyndon


    No, the gpio is not 5v tolerant.
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    chalkhills


    Ok - Thanks for that Lyndon - I'll use pull up resistors and an open collector to drive the inputs - should be ok (I think)

    Dave
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    Peer Klausen

    I have the same question in 2016 regarding the HD120 GPIO port, i have read that you use the 74541 interface chip and acording to the datasheet for that chip it is 5V tolerant.

    So the question is if I can input 5 volt on the GPIO on a HD120, now that it is 5V tolerant (if the info with the 74541 chip is correct).

    I have a 5V microcontroller setup that would be so much more easy to interface with if works.

    Regards

    Peer

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    Romeo

    >So the question is if I can input 5 volt on the GPIO on a HD120

    No you cannot do this. The ESD protection diodes will try to clamp the input signals to +3.3V plus a diode drop.  If you apply +5V there then you will burn them out.

    Regards,

    Romeo

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