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.

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