GENERAL DESCRIPTION

IS22C022 is a high quality voice synthesizer capable of varying playback duration. A proprietary ADPCM algorithm is used. The audio message is stored in a 512K bits on-chip EPROM which can store up to 20 seconds of voice data at 6 KHz sample rate.

FEATURES

• Minimum 20 second voice length at 6 KHz

• Versatile features for playback

• Combination of voice building blocks extends the duration of playback

• Voice data re-use saves memory space

• Four trigger pins, S1 to S4 for eight groups

• SBT for sequential play-all or random play

• Holdable and unholdable, edge and level triggering option

• 15 ms debounce time suitable for CDS

• IRP interrupt pin for master reset

• Three programmable output pins for STP Stop Pulse, BUSY Signal, and LED

• Built-in oscillator with variable sample rate

• Single external resistor to determine sample rate

• Built-in D/A converter, EPROM

• ADPCM data compression provides high sound quality

• Optional pop noise elimination function

• COUT pin drives speaker with a transistor

• VOUT1 and VOUT2 drives buzzer or speaker directly

• Auto-power down

• 2.4V-6V single power supply operation

• Low standby current (<5 µA at 3V)

• Development tools support