18F4420 and 1-Wire

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  1. - 23rd March 2015, 18:13 #1
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    Default Re: 18F4420 and 1-Wire

    Quote Originally Posted by Dave View Post
    4K7 seems to be a bit on the high side, I have always used 2k2 for my pullups. Maybe a reason?
    a very good reason is the cable length between the probe and the PCB ....

    Alain
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  2. - 23rd March 2015, 19:41 #2
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    Default Re: 18F4420 and 1-Wire

    I haven't tested with long wires yet:
    http://www.picbasic.co.uk/forum/showthread.php?t=17282
    but 4K7 worked at 115,200 at 64MHz in preliminary tests.

    (Diagram in post #1 is not updated, only 2 resistors used)

    Robert
  3. - 24th March 2015, 12:50 #3
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    Default Re: 18F4420 and 1-Wire

    115,200.... What?
    Dave Purola,
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  4. - 24th March 2015, 13:09 #4
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    Default Re: 18F4420 and 1-Wire

    Actually the main reason for lower value resistors is when there are several devices on the bus. If you are just using one device, 4.7 K is fine and wastes less current.
    Robert, you must have posted on the wrong thread? No RS-232 in this discussion...
  5. - 24th March 2015, 13:28 #5
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    Default Re: 18F4420 and 1-Wire

    Quote Originally Posted by Dave View Post
    115,200.... What?
    Oops. Overly medicated apparently. LOL
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