HT812D0

HT812D0 2.8 Second LOG-PCM Speech 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 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. The HT812D0 provides four key inputs and two programmable FLAG outputs. With a 2.4V~5.0V power supply, a complete synthesized voice...