General Description
The HT812D0 is a single chip LOG-PCM voice synthesizer LSI with 2.8-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 (1µA Typ. for VDD=3V)
• Minimal external components
• 124 words table ROM for key functions
• Programmable silence length and end-pulse width (minimal end-pulse width is 330µs at a 6kHz sampling rate)
• 2.8-second voice capacity
• Controllable volume
• FLAG1 options:
– End-pulse output
– 3Hz flash
– 6Hz flash
– Voice output indication
– Busy output
• FLAG2 options:
– 3Hz flash
– 6Hz flash
– Busy output
• Four keys
• Key options:
– Stop key: KEY4
– Random (only for KEY1)
– Sequential (only for KEY1)
– Repeat (for all KEYs, under retriggerable condition)
– Key debounce time (for all KEYs): 700µs, 22ms, 45ms, 180ms (based on a sampling rate of approximately 6kHz)
– One shot (for all KEYs)
– Level-trigger
– Pull-high resistance (for all KEYs)
• Section options:
– Retriggerable
– Non-retriggerable
APPLICATIONs
• Toys
• Alarm clocks
• Public address system
• Alert & warning system
• Sound effect generators