General Description

The HT81003 is a Mask ROM type. The HT81003 is a single-chip voice synthesizer LSI with 3-second voice capacity at 5kHz sampling rate. The chip when triggered drives a speaker through an external transistor with a PWM output. Negligible current is consumed in the standby state.

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)

• 3-sec voice capacity (based on a 5kHz 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

• 2 keys

• Key options

- Sequential/Directed

- Repeat (KEY2)

- STOP key (KEY2)

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

- One shot/Normal

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

• Section options

- Retriggerable

- Non-retriggerable

• Dice form or 16-pin DIP package

Applications

• Leisure products

• Alarm clocks

• Public address system

• Alert and warning system

• Sound effect generators