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IS22C012
VERSATILE 10 SEC INSTANT VOICE ROM
FEATURES
• Minimum 10 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 • 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 • • • • • • • • • • •
ISSI
ADVANCE INFORMATION FEBRUARY 1999
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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
GENERAL DESCRIPTION
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Group of sections
The voice data memory area of the IS22C012 can be subdivided into 124 sections. Any combination of these sections will form an individual group for data playback. A maximum of eight groups are available with activation controlled by S1 to S4 pins. The SBT pin can be used to trigger multiple groups playback in sequence.
IS22C012 is a high quality voice synthesizer capable of varying playback duration. A proprietary ADPCM algorithm is used. The audio message is stored in a 256K bits onchip EPROM which can store up to ten seconds of voice data at 6 KHz sample rate. The IS22C012 eliminates the need of complicated circuitry in voice playback but still achieves high voice quality. Sounds such as human speech, animal sounds, musical sounds and even special sound effects can be synthesized. Versatile combinations in sections achieve longer playback duration. In addition, devices can be cascaded to achieve longer voice duration. Two devices can be configured in parallel in order to achieve signal mixing without an external mixer in which speech can be mixed with background music each from one of two different chips. The IS22C012 provides wide operating voltage range from 2.4V to 6.0V. PWM digital amplifier output pins, VOUT1 and VOUT2 provides direct drive to buzzer or speaker. A current output pin, COUT, enables the device to drive a speaker through a low cost NPN transistor. No complex filtering or amplifier circuit is needed. An automatic rampdown function eliminates undesired noise at the end of playback.
Group Configuration
Voice within each group are combinations of different fixed memory sections of up to 124 sections. These sections are the fundamental voice building blocks for arranging playback without limiting sequencing. This provides flexibility and allows data to be re-used, beneficial for applications with many repeated sounds or words. An example of group configuration is illustrated below: Group No. Group 1 Group 2 Group 3 Group 4 Section Entry Sec 1 + Sec 2 + Sec 3 ……. Sec 109 Sec 3 + Sec 2 Sec 10 + Sec 11 + Sec 12 Sec110 + Sec 10 + Sec 5
This specification contains ADVANCE INFORMATION data. ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any errors which may appear in this publication. © Copyright 1999, Integrated Silicon Solution, Inc.
Integrated Silicon Solution, Inc. — 1-800-379-4774
ADVANCE INFORMATION VP010-0B 02/24/99
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IS22C012
Group Configuration (continued)
The entry of sections for each group is truly random and without limitation. However, there is a limit in the total number of entries for eight groups, which is 992 in the IS22C012. It is acceptable to allocate all entries into only one group or distribute out to other groups. It depends on how many groups of messages are required.
ISSI
Selections in Output Buffer
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frequency. As a matter of fact, the available choices are also dependent on the pullup resistor value at the OSC pin. For example, if the fundamental frequency choice is F, it can provide choices in x1, x1-1/2, x2, x3.
Programmable Options
Groups in IS22C012 can have independent options. They include: • • • • • Edge or Level trigger Unholdable or Holdable trigger Retriggerable or non-retriggerable LED1, LED2, Busy, and Stop pulse are configurable Four selections in playback frequency
There are three independent output pins, OUT1, OUT2, and OUT3, available for several combinations of LED1, LED2, Stop Pulse, and Busy Signal for each group. The following table illustrates the four different combinations. OUT1 1. 2. 3. 4. LED1 STOP Busy LED2 OUT2 LED2 LED1 Stop Busy OUT3 Busy LED2 LED1 Stop
Selections in Triggering
The IS22C012 can be triggered in different ways, Edge or Level t.