MSS0271 Ver la hoja de datos (PDF) - Mosel Vitelic, Corp

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MSS0271

2.7" VOICE ROM

Mosel Vitelic, Corp 

MOSEL VITELIC INC.

Preliminary

MSS0271

Signals

SP+ and SP-

They are tristate during standby.

They are not at standby current when the data is in the

middle.

These two pins can drive buzzer or speaker, 8 ohm or

16 ohm, directly. The speaker used should have its

band width (BW) at the center of your sound frequency

domain or you are unable to play your sound good by

this speaker.

For instance, you have your sound spans over

frequency from 100 Hz through 10 KHz. A speaker with

BW meets requirement will play this sound good. A

speaker with BW narrower than requirement (either has

higher low-cut or lower high-cutoff) will distort the sound

very much because that most of the energy of the

playback sound is unable to be played by this speaker.

This pair has zero output when sound data is zero. This

pair has full output when sound data is the highest.

This pair has half of full output when sound is silence at

middle data value. This pair has half of full output when

playing sound at appended memory-less mute.

The output depends on Vdd bias very much.

Herein zero output does not mean zero potential,

neither ground.

It is recommended to select voltage source carefully

and do not supply this chip with a 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.

The speaker characeristics and housing impacts the

loudness very much.

TG

This is a high true activating signal input pin. An

internal pull low R TG is built in.

There is no schmit trigger circuit implemented.

Ramp up and Ramp down

See the explanation of Audio.

Sample Rate

All the AC parameters depend on sample rate except

three - t PUD, t P and t R. The numbers mentioned in this

data sheet are based on 6 KHz sample rate if not

specified. Higher SR has quicker LED flasher, quicker

response. Lower SR has slower LED flasher, slower

response.

Retriggerable TG

Retriggerable TG means the sound played could be

terminated immediately while further TG activated and

play the sound from the very beginning.

Holdable and retriggerable

This combination allows user controlling both the output

and the input. Its output is holdable and the input could

retrigger the former. This is an exquisite feature. It is not

provided on this single trigger voice chip.

Fix flash LED

Fix 3 Hz flash means this pin turns LED lamp on for T

LED3 and then turns it off for T LED3 alternately. Fix 6 Hz

flash means quicker, it turns on T LED6 and then turns off

T LED6.

The 3 Hz as well as 6 Hz is sample rate dependent.

When repeatedly playing a word, interesting LED flash

may happen in concatenation. The word length may not

be the multiples of T LED3 (or T LED6), a new flash cycle

will start before the last flash cycle terminates.

Dymanic Flash LED

The LED turns on whenever the sound amplitude (the

current from SPs) is over a certain threshold potential (I

LEDT). The sound potential could be measured in data

value as an alternative.

IN0 and IN1

They should be bonded to ground both regularly.

While abnormal lot (pitch shifted) is encountered,

special bonding could be done herein.

LB

This pin could be optionally masked as either high true

Busy signal or LED flasher which is turned on in sink

way by I LED. Refers to paragrahps "Mask option" and

"terms". Up to 3 types of LED flasher could be chosen.

Terms

Audio

Audio means the signal from the pin pair SP+ and SP-.

Due to a sophisticated architecture, there demands no

ramp up (or ramp down) to eliminate the pop noise at

the sound starting and ending.

Debounce time

Either Fast or Slow debounce are provided by mask

options. The Fast debounce acknowledges very short

trigger. So, the sound will play "sensitively". User should

be very carefully to choose trigger switch while "Fast

debounce" is specified.

Application Notes

Speaker

The typical application speaker is 8 ohm, 1/4 watt. Refers

to above paragraph SP+ and SP- for more description on

required speaker.

Buzzer

The recommended resonant frequency should be 1 KHz

to get the best sound response. The response BW also

should be fit to the required sound band width. Refer to

above paragraph SP+ and SP- for more description.

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

4/12

PID257*** 05/97

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