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Interfacing a Picmicro with a TC620 temp sensor

Discussion in 'Electronic Design' started by Pj, Mar 6, 2008.

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  1. Pj

    Pj Guest

    I'm trying to run some tests with the TC620. I want to pole the high
    out, low out and control using porta pins 0,1 and 2 of a pic 16f84f.
    All I get is garbage. Mircrochip says connect to the interups. My
    question is can the 620 interface directly with the pic, or do I need
    other components between the two chips? If so, why? I have the notes
    on the TC4469 quad CMOS driver, but I want to do some simple testing
    before complicating things. Any help will be appreciated.
     
  2. Fred Bloggs

    Fred Bloggs Guest

    Looks like it has tons of drive. Maybe it's something else:
    "Care must be taken to ensure the LOW SET programming
    resistor is a smaller value than the HIGH SET programming
    resistor. Failure to do this will result in erroneous
    operation of the CONTROL output.
    Care must also be taken to ensure the LOW SET
    temperature setting is at least 5°C lower than the HIGH SET
    temperature setting. That is:
    LOW SET £ HIGH SET – 5°C"
    Looks like about the only way to screw things up , assuming you know how
    to identify pin numbers correctly...
     
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