HT815D0 Datasheet, PDF (1/15 Pages) Holtek Semiconductor Inc – 11.2-Second LOG-PCM Speech

HT815D0
11.2-Second LOG-PCM Speech
Features
· Operating voltage: 2.4V~5.0V
· Directly drives an external transistor
· Low standby current (1mA typ. for V_DD=3V)
· Minimal external components
· 508 words table ROM for key functions
· Programmable silence length and end-pulse
width (minimal end-pulse width is 330ms at a
6kHz sampling rate)
· 11.2-second voice capacity (based on a 6kHz
sampling rate)
· FLAG1 options
– _{End-pulse output}
– _{3HzB flash}
– _{6HzB flash}
– _{Voice output indication}
– _{Busy output}
· FLAG2 options
– _{3Hz flash}
– _{6Hz flash}
– _{Busy output}
Applications
· Leisure products
· Alarm clocks
· Public address system
General Description
The HT815D0 is a single chip LOG-PCM voice
synthesizer LSI with 11.2-second voice capacity
at 6kHz sampling rate. The chip when trig-
gered drives a speaker through an external
transistor with a current switch D/A converter
output. Negligible current will be consumed in
the standby state.
The HT815D0 provides 12 key inputs and 2 pro-
grammable FLAG outputs. With a 2.4V~5.0V
power supply, a complete synthesized voice
playback system can be easily built with very
few external components.
· Controllable volume
· 12 keys
· Key options
– _{Stop key: KEY12}
– _{Random (only for KEY1)}
– _{Sequential (only for KEY1)}
– _{Repeat (for all KEYs)}
– _{Key debounce time (for all KEYs): 700ms,}
22ms, 45ms, 180ms (based on a sampling
rate of 6kHz)
– _{One shot (for all KEYs)}
– _{Level-trigger}
– _{Pull-high resistance (for all KEYs)}
· Section options
– _{Retriggerable}
– _{Non-retriggerable}
· Dice form or 16/20/24-pin DIP,
20/24-pin SOP package
· Alert & warning system
· Sound effect generators
The customer¢s voice sources are recorded sec-
tion by section into an internal mask ROM. The
sectional playback arrangement instructions of
each key are stored in the table ROM. The key
features are also programmable. With such a
flexible structure, the HT815D0 is excellent for
versatile voice applications.
1
March 15, 2000