HT815D0 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT815D0

11.2-Second LOG-PCM Speech

Holtek Semiconductor 

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 VDD=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

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