HT9200A/B
DTMF Generators
Features
•
•
•
Operating voltage: 2.0V~5.5V
Serial mode for the HT9200A
Serial/parallel mode for the HT9200B
•
•
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Low standby current
Low total harmonic distortion
3.58MHz crystal or ceramic resonator
General Description
The HT9200A/B tone generators are designed
for
µ
C interfaces. They can be instructed by a
µ
C to generate 16 dual tones and 8 single tones
from the DTMF pin. The HT9200A provides a
serial mode whereas the HT9200B contains a
selectable serial/parallel mode interface for
various applications such as security systems,
home automation, remote control through tele-
phone lines, communication systems, etc.
Selection Table
Block Diagram
1
21st Aug ’98
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
