| Introduction: |
The PCD3312C is an
inexpensive (~$3.00 in singles), 8-pin silicon gate CMOS
integrated circuit manufactured by Philips
Semiconductors. It is intended principally to provide the
dual-tone multi-frequency (DTMF) combinations required
for tone dialing systems. The various audio output
frequencies are generated from an on-chip 3.58 MHz quartz
crystal-controlled oscillator. An on-chip voltage
reference provides a constant output amplitude which is
independent of the operating supply voltage and ambient
temperature. In addition to the standard DTMF
frequencies, the PCD3312C also provides twelve standard
frequencies used in simplex modem applications and two
octaves of musical scales in steps of semitones.
In this application note, we will connect a PCD3312C
to the OOPic's
I2C Network and write a program to dial a phone number.
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I2C Application Note #2