General Description
The HT818D0 is a single chip LOG-PCM voice synthesizer LSI with 22.4-second voice capacity at a 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: 3.6V~5.0V
• Directly drives an external transistor
• Low standby current (1μA 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 330μs at a 6kHz sampling rate)
• 22.4-second voice capacity (based on a 6kHz sampling rate)
• Section options
- Retriggerable
- Non-retriggerable
• 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): 700μs, 22ms, 45ms, 180ms (based on a 6kHz sampling rate)
- One shot (for all KEYs)
- Level-trigger
- Pull-high resistance (for all KEYs)
• Dice form or 20/24-pin DIP/SOP package
APPLICATIONs
• Leisure products
• Alarm clocks
• Public address system
• Alert and warning system
• Sound effect generators