DTMF Tone decoder problems

[Ren]

Hi guys Help please, I constructed the circuit given in the data sheet of the cm8870pi ic, but i have a problem some times all the output on the BCD pins Q1 ~ Q4 goes high when the circuit energize. why is that and how to solve it or is it that the output is inverted? ….thanks…

[AJISH ALFRED]

Hi Ren,

please post your circuit here so that we can help you

[Ren]

Well Ajish thas for the help, but I got my decoder up and running, and my h-bridge and motor going, now is the hard part I’m trying to interface the pic16f690 (demo board chip ) to and 16×2 LCD to show the status of each device.

[AJISH ALFRED]

Keep up the good work Ren, all the best

[Author]

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