APLUS APl840N Datasheet

1

32 to 40 SEC INSTANT VOICE ROM

FEATURES

* Voice length at

- 8 KHz sampling is 32 seconds

- 6 KHz sampling is 40 seconds
* Silence compression to save memory
* Eight trigger pins,TG1 to TG8 for 32 sections
* SBT pin play-all or sequential play-all
* 15 ms debounce time suitable for CDS
* IRP interrupt pin stops playback at once
* STP stop pulse generated at end of playback
* BUSY signal for CPU control
* Two LEDs flash at 3 Hz internal
* 3.0V to 6V single power supply operation
* Low standby current (<5 uA at 3V)
* Auto-power down
* Built-in oscillator, D/A converter, EPROM
* ADPCM data compression
* Optional pop noise elimination function
*C

OUT pin drives speaker with a transistor

* Development tools support
*V

OUT1 and VOUT2 drives buzzer directly

* Sampling rate determined by external resistor
* Holdable and unholdable triggering option
* Industrial temperature available

GENERAL DESCRIPTION

API840N is a high-quality voice synthesizer with a capacity
of 32 to 40 seconds. A proprietary ADPCM algorithm is
used. The audio message is stored in a 1024-Kbit on-chip
EPROM.

The API840N eliminates the need of complicated circuitry
in voice playback (Figure 1) but still achieves high voice
quality. Sounds such as human speech, animal sounds,
musical sounds, and even special sound effects can be
synthesized. Devices can be cascaded to achieve longer
voice duration (Figure 3). Two devices can be configured
in parallel (Figure 4) in order to achieve signal mixing
without an external mixer allowing speeches to be mixed
with background music synthesis from two different chips.

The instant programming nature of the API840N allows a
very short production turnaround time. There are no NRE
charges that are usually required with conventional voice
ROMs. Users now can apply a voice synthesis function as
an additional feature to their products even when production
volume is relatively small. It is also ideal for trial or
engineering prototyping. As a result, the initial investment
is minimal and the risk in the product development phase
is reduced.

The API840N provides a wide voltage operating range
from 3.0V to 6.0V. A pair of PWM output pins, V

OUT1 and

VOUT2 provide direct drive to a buzzer (Figure 2). Voice
quality from a buzzer is comparable to speaker output and
power consumption is much lower.

A current output pin, COUT, enables the device to drive a
speaker with a low cost NPN transistor. No complex
filtering or amplifier circuit is needed. An automatic ramp
up/down function eliminates the undesired noise at the
end of playback.

Up to 32 sections are accessible through TG1 to TG8.The
SBT trigger pin can be programmed to playback all 32
sections or sequentially from section 1 to 32. An interrupt
pin (IRP) and stop pulse (STP) or BUSY signals provide
handshaking with microprocessors or other API840N
devices. All trigger pins give 15 ms debounce time and is
ideal for CDS applications as in Figure 6. Two LED drivers
are available, flashing on and off at approximately 3Hz
intervals (Figure 5). The internal voltage compensation
oscillator requires only one external resistor. Different
sampling frequencies are determined by the external
oscillator resistor value.

JUNE 1999

APLUS API840N

2

Programmable Options

The API840N provides different control functions for user
specified applications. They include:

* Non-sequential or Sequential Play-all
* Unholdable or Holdable trigger
* STOP or BUSY signal selection
* Automatic ramp-up/ramp-down or no ramp-up/ramp-down

OSCILLATOR

OSC

CLOCK

GENERATOR

CONTROL

LOGIC

TG1

TG8

SBT

IRP

LED

DRIVER

LED2
LED1

STP

POP NOISE

REDUCTION

ADDRESS

SEQUENCER

VOICE

EPROM

ADPCM

DECODER

BUZZER
BUFFER

D/A

C

OUT

V

OUT1

V

OUT2

GND

Vcc

BLOCK DIAGRAM

OPERATING RANGE

Range Ambient Temp. Vcc

Commercial 0°C to +70°C 3.0V to 6.0V
Industrial -40 °C to +85°C 3.0V to 6.0V

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Parameter Value Unit

VTERM Terminal Voltage with Respect to GND -0.5 to +7.0 V
TBIAS Temperature Under Bias -40 to +85 °C
TSTG Storage Temperature -55 to +125 °C

Notes:

1. Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at these or any other conditions above
those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.

Silence Compression

If a particular sound sequence includes periods of silence,
the API840N will automatically compress the silence to
save memory space. This compression will not affect
playback of the sound sequence.

APLUS API840N

3

SECTION TRIGGERING

TG1 TG2 TG3 TG4 TG5 TG6 TG7 TG8 Section

HIGH NC NC NC NC NC NC NC 1

NC HIGH NC NC NC NC NC NC 2
NC NC HIGH NC NC NC NC NC 3
NC NC NC HIGH NC NC NC NC 4
NC NC NC NC HIGH NC NC NC 5
NC NC NC NC NC HIGH NC NC 6
NC NC NC NC NC NC HIGH NC 7
NC NC NC NC NC NC NC HIGH 8

HIGH HIGH NC NC NC NC NC NC 9

NC HIGH HIGH NC NC NC NC NC 10
NC NC HIGH HIGH NC NC NC NC 11
NC NC NC HIGH HIGH NC NC NC 12
NC NC NC NC HIGH HIGH NC NC 13
NC NC NC NC NC HIGH HIGH NC 14

NC NC NC NC NC NC HIGH HIGH 15
HIGH NC NC NC NC NC NC HIGH 16
HIGH HIGH HIGH NC NC NC NC NC 17

NC HIGH HIGH HIGH NC NC NC NC 18

NC NC HIGH HIGH HIGH NC NC NC 19

NC NC NC HIGH HIGH HIGH NC NC 20

NC NC NC NC HIGH HIGH HIGH NC 21

NC NC NC NC NC HIGH HIGH HIGH 22
HIGH NC NC NC NC NC HIGH HIGH 23
HIGH HIGH NC NC NC NC NC HIGH 24
HIGH HIGH HIGH HIGH NC NC NC NC 25

NC HIGH HIGH HIGH HIGH NC NC NC 26

NC NC HIGH HIGH HIGH HIGH NC NC 27

NC NC NC HIGH HIGH HIGH HIGH NC 28

NC NC NC NC HIGH HIGH HIGH HIGH 29
HIGH NC NC NC NC HIGH HIGH HIGH 30
HIGH HIGH NC NC NC NC HIGH HIGH 31
HIGH HIGH HIGH NC NC NC NC HIGH 32

APLUS API840N