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HT12E & HT12D Rosc values

Choosing a appropriate value of ROSC is critical for the functioning of HT12E and HT12D pair during Muxing and DeMuxing.  The following are the value pairs that are found to be working correctly at 5V power supply for both the ICs.  Although, they support variety of voltages, it is always better to keep them at the same voltage to avoid confusion on the internal oscillator frequency.  If the data sheet is seen, it becomes apparent that the internal oscillator frequency is function of (Vdd, Rosc).

HT12E ROSC HT12D ROSC
1M 47K
1.1M 51K
750K 33K
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  1. godwinsamraj
    August 8th, 2013 at 12:50 | #1

    in encoder side voltage drop will be there so its possible to use Rosc as you mention above

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