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