HT812D0 - Holtek Semiconductor Inc

HT812D0 2.8 Second LOG-PCM Speech

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. W.

Features

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• 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
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• Four keys Key options:
  – Stop key: KEY4
  – Random (only for KEY1)
  – Sequential (only for .