General Description

The EasyVoiceTM is a single-chip voice synthesizer LSI . The chip when triggered drives a speaker directly or through an external transistor with a PWM output. Negligible current is consumed in the standby state.

The HT81XXX provides direct key or Matrix key input and 2 programmable FLAG outputs. With 2.4V~5.0V power supply, a complete synthesized voice playback system can be easily built with very few external components.

Features

? Operating voltage: 2.4V~5V

? Directly drives an external transistor

? PWM function directly driver speaker

? Low standby current (1A typ. for VDD=3V)

? Minimal external components

? 240 notes table ROM for key functions

? Programmable silence length and end-pulse width (minimal end-pulse width is 1.3ms at 8kHz sampling rate)

? Controllable volume

? FLAG1 options

- End-pulse output

- 3Hz, 3HzB flash

- 6Hz, 6HzB flash

- Busy output

- OFF

? FLAG2 options

- 3Hz flash

- 6Hz flash

- Busy output

- OFF

? 6 keys (Directed)

? 8 keys (Matrix key)

? Key options

- Sequential/Directed

- Repeat (KEY2~KEY6)

- STOP key (KEY6)

- Key debounce time: 1.2ms, 22ms, 45ms (based on a 8kHz sampling rate)

- One shot/Normal

- Pull-high resistance: 0, 50kΩo, 100kΩ, 200kΩ

? Section options

- Retriggerable

- Non-retriggerable

? Dice form or 16-pin DIP package

Applications

? Leisure products

? Alarm clocks

? Alert and warning system

? Sound effect generators