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Cout

Cout is tristate during standby.

Cout has zero current output when sound data is

zero.

Cout has full current output when sound

data is the highest. Cout has half of full current

output when sound is silence at middle data value.

Cout has half of full current output when playing

sound at appended memory-less mute.

Ico of Cout behaves two different characteristics

shown as curve 2 and curve 3.

Curve 3 is

recommended when operating at 2.5V through

5.0V. Curve 2 is recommended when operating at

5.0V through 6.0V.

The bypass Cout Resistor (named R2) is used to

bypass the audio output current from Cout. This

bypassing extra current to ground gives a way to

prevent the saturation of audio waveform amplified

by transistor. This Resistance of R2 is 470 ohm

typically. It always is not very small. Or user can

let it open if the transistor has a fair beta value.

Due to Cout depends on Vdd bias very much, this

R2 resistance needs be very carefully selected

when user supplies the voltage potential source in

poor flatness or in poor drive capability.

What the poor source means either its potential

drops as the load varies or its potential drops as its

capacity exhausted.

A transistor with beta value 150 is sufficient for

typical applications. Larger beta value get larger

sound but may have the amplified waveform

saturated.

8 ohm speaker is recommended.

The speaker

characeristics and housing impacts the loudness

very much.

When user is using variable loudness, user must

carefully calculate the bypass resistance R2 and

transistor's beta value due to that the current from

Cout may vary very much due to user's specified

loudness variance.

V1, V2

They are tristate during standby state.

These two pins can drive buzzer directly.

The

piezo buzzer used should have its resonant

frequency at the center of your sound frequency

domain or you are unable to play your sound good

by this buzzer.

For instance, you have your sound spans over

frequency from 100 Hz through 1 KHz. A buzzer

with resonant frequency at 300 Hz will play this

sound good. A buzzer with resonant frequency at

1 KHz will distort the sound very much because

that most of the energy of the playback sound is

unable to be played by this buzzer.

Signals

OS, OW, OX, OY, OZ

There are 5 output pins provided. Each pin can

perform its performance independent on other four

pins.

An output pin can be masked to perform one out of

15 features per entry. But it has restriction : a pin

can perform up to 8 features only at a mask code.

These 8 features should not have too far

relationships.

Contact our sales representatives if you want to

use diverse output performance.

Rosc

This is a pin to provide bias to activate built in

VCO circuit. A 600 K ohm resistor serial from Vdd

to this pin (named R1) can play the audio output at

6 KHz sample rate at pitch option 4.

Larger

Resistance provided at this location plays lower

sample rate. A 240 Kohm resistor plays 15 KHz

sample rate at same condition.

The Vdd bias has very less impact on the

relationship between Rosc and sample rate. To

play 6 KHz, user needs 600 K ohm at 3 Vdd and

590 K ohm at 6 Vdd. To play 15 KHz, user needs

240 K ohm at 3 Vdd and 230 K ohm at 6 Vdd.

K1, K2, K3, K4

These four pins have two ways to perform.

To cooperate with RW1, RW2, RW3 and RW4,

they form a 4 x 4 matrix in 16 cross points. The

touch of a cross point will pass signal from a RW

pin to this K pin and activates a trigger signal to

play respectively sentence.

To not cooperate with RWn, these K pins can act

as straight trigger and work standalone. A Vdd

provided to Kn can play sentence.

RW1, RW2, RW3, RW4

These four pins can cooperate with Kn pins to form

a 4 x 4 matrix in 16 cross points. The touch of a

cross point passes signal from this RW pin to K

pin(s) and activates a trigger signal to play

corresponding sentence.

The result to be played is not guaranteed when

operating at below three conditions:(1) All four

RWn signal pins tied together, (2) Any three RWn

signal pins connected together, (3) Any two RWn

signal pins connected together. The result may

even be no sound played.

PID247*** 09/96

MSS0307/S0607/S0907/S1207/S1507/S1807

MOSEL VITELIC INC.

Specifications subject to change without notice, contact your sales representatives for the most recent information.

(Preliminary)