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MSS1207 Datasheet(PDF) 4 Page - Mosel Vitelic, Corp |
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MSS1207 Datasheet(HTML) 4 Page - Mosel Vitelic, Corp |
4 / 39 page 4/39 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) |
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