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 triggered drives a speaker through an external transistor with a current switch D/A converter output. Negligible current will be consumed in the standby state.

特性 Features

? Operating voltage: 2.4V~5.0V

? Directly drives an external transistor

? Low standby current (1A 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 330s 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

? 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): 700s, 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

Applications

? Leisure products

? Alarm clocks

? Public address system

? Alert & warning system

? Sound effect generators