APLUS API8208A Datasheet

APLUS API8208A

ANTTILE 20 SEC INSTVERSA

VOICE ROM

FEATURES

inimum 20 second voice length at 6 KHzM •

Versatile features for playback•

ombination of voice building blocksC •

extends the duration of playback

oice data re-use saves memory spaceV•

Four trigger pins, TG1 to TG

•
SBT for sequential play-all or random play•
Holdable and unholdable, edge and level•

triggering option
15 ms debounce time suitable for CDS•

RP interrupt pin for master resetI•

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

Built-in oscillator with variable sample rate•

ingle external resistor to determine sample rateS•
Built-in D/A converter, EPROM•
ADPCM data compression provides high sound•

quality

ptional pop noise elimination functionO •

pin drives speaker with a transistorOUT•C

2 drives buzzer or speaker di-OUT and V1OUT•V

rectly
Auto-power down•

3.0V-6V single power supply operation•
Low standby current (<5 µ

4 for eight groups

A at 3V

)•

GENERAL DESCRIPTION

API8208A 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.

The API8208A 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 API8208A provides wide operating voltage range
from 3.0V to 6.0V. PWM digital amplifier output pins,
V
speaker.

speaker through a low cost NPN transistor. No complex
filtering or amplifier circuit is needed. An automatic
ramp-down function eliminates undesired noise at the end
of playback.

OUTV1 and OUT

2 provides direct drive to buzzer or

OUTA current output pin, C

, enables the device to drive a

Group of sections

The voice data memory area of the API8208A can be
subdivided into 126 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

trigger multiple groups playback in sequence.

TG1 to TG4 pins. The SBT pin can be used to

Development tools support•

11/15/99

1

APLUS API8208A

Group Configuration

Voice within each group are combinations of different
fixed memory sections of up to 126 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. Section Entry

Group 1 Sec 1 + Sec 2 + Sec 3 ……. Sec 109
Group 2 Sec 3 + Sec 2
Group 3 Sec 10 + Sec 11 + Sec 12
Group 4 Sec110 + Sec 10 + Sec 5

Group Configuration

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
API8208A 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.

Selections in Playback Frequency

This option provides four choices for each group in
frequency which implies it is possible to have four
different sampling rates in one chip or one sample rate
with a different playback 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.

Selections in Playback Mode

There are two playback modes, Sequential and Random
in the API8208A If the chip is programmed in Sequential
Mode, messages will playback in the order from Group 1
to Group 8 by triggering the SBT pin. If the chip is
programmed in Random Mode, messages will be played
back randomly by triggering the SBT pin.

Selections in Output Buffer

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 OUT2 OUT3

Programmable Options

Groups in API8208A can have independent options. They
include:

• Edge or Level trigger

• Unholdable or Holdable trigger

• Retriggerable or non-retriggerable

• Sequential or Random playback

• LED1, LED2, Busy, and Stop pulse are configurable

• Four selections in playback frequency

Selections in Triggering

The API8208A can be triggered in different ways, Edge or
Level trigger, Holdable or Unholdable, Retriggerable or
Non-retriggerable. The combinations of the triggering
options provide versatile playback.

By enabling Retrigger, the playback can be controlled in
Stop and Start mode. A trigger on any trigger pin will stop
the current message and start the next message immedi­ately.

1. LED1 Busy LED2

2. Stop LED2 LED1

3. Busy LED1 Stop

4. LED2 Stop Busy

LED1 and LED2 are complemented outputs flashing at
approximately a 3 Hz rate. Stop pulse (STOP) gives a 15
ms positive pulse at the end of the playback for each
Group with option have or do not have the Stop pulse.

Busy is active high and Section dependent but not Group
dependent. Even if same section in different group may
have different output in Busy output. For instance, BUSY
can be high for Section 4 in Group 1 but low in Group 4.
BUSY can be used as a synchronous signal. During
standby mode all three outputs must be low.

Software Support

APLUS provides dedicated software to the customer. With
this tool, the customer can compose their own messages
and configure the chip to fit into their applications very
easily.

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APLUS API8208A

BLOCK DIAGRAM

OSC

TG1
TG2
TG3

TG4

SBT

IRP

OUT1
OUT2
OUT3

OSCILLATOR

CLOCK

GENERATOR

CONTROL

LOGIC

PIN CONFIGURATIONS

300-mil PDIP

OUT1

V

OUT1

V

OUT2

GND
OUT2
OUT3

C

OUT

OSC

1
2
3
4
5
6
7
8

OUTPUT

DRIVER

16
15
14
13
12
11
10

V

CC

ADDRESS

SEQUENCER

POP NOISE

REDUCTION

VOICE

EPROM

ADPCM

DECODER

D/A

BUZZER
BUFFER

GND

C

OUT

V

OUT1

V

OUT2

PIN DESCRIPTION

OUT1 Programmable output 1
OUT2 Programmable output 2
OUT3 Programmable output 3

IRP
SBT
TG4
TG3
V

CC

TG2
TG1

9

V

PP

VOUT1
VOUT2

GND Power ground
COUT
OSC

VPP

TG1
TG2

VCC Positive power supply

TG3
TG4

SBT

IRP

Note:

1. The following pins are used to program data into the memory:
pins 4, 5, 6, 8, 9, 12, 15 and 16.

PWM audio signal output for buzzer and speaker
PWM audio signal output for buzzer and speaker

Current output from internal DAC for speaker playback
Oscillator resistor pin to control sampling frequency
Program power supply, no connect when voice playback
Trigger switch 1, internal pull low, active high
Trigger switch 2, internal pull low, active high

Trigger switch 3, internal pull low, active high
Trigger switch 4, internal pull low, active high
Sequential trigger, internal pull low, active high
Interrupt to stop playback, internal pull low, active high

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