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H clamp on USB Host Controller

Discussion in 'Embedded' started by aubrey, Mar 9, 2008.

  1. aubrey

    aubrey Guest

    I was reading S17998E.pdf, the datasheet for the NEC uPD720102 Host
    Controller.

    In table 2.1 it says to use an "H" clamp on a certain pin if it is
    unused.

    Does this just mean a 10K pullup or is it something more exotic?
     
    aubrey, Mar 9, 2008
    #1
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  2. aubrey

    Rich Webb Guest

    From the context in the data sheet, where the OCI pins are active low,
    it looks like they mean '"H" clamp' as in 'clamp high'.

    Not the clearest usage, certainly. My first guess (before looking at
    the data sheet) was that they may have meant an H-"shaped" clamp,
    i.e., clamp to Vcc/2 with a voltage divider. That ain't it, tho.
     
    Rich Webb, Mar 10, 2008
    #2
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