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IZ8057 Folha de dados(PDF) 3 Page - List of Unclassifed Manufacturers |
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IZ8057 Folha de dados(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 7 page IZ8057 Korzhenevskogo 12, Minsk, 220064, Republic of Belarus Fax: +375 (17) 278 28 22, Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61, 277 69 16 E-mail: belms@belms.belpak.minsk.by URL: www.bms.by FUNCTIONAL DESCRIPTION Oscillator Circuit The oscillation frequency is used as a time base for tone and tempo generators, the accuracy of which affects the quality of which affects the quality of the melody generator. Tempo Generator There are 14 tempos available in this embodiment: 82, 88, 95, 103, 112, 123, 137, 154, 176, 205, 246, 308, 410 and 615 notes per minute. Tone Generator The tone generator is a programmed divider. The tone frequencies are created by dividing the oscillator frequencies with M, where M is an integer from 32 to 127. There are 27 tones selectable in this embodiment, including end code. Rhythm Generator The rhythm generator is also a programmed divider and is used to generate the beat for each tone. In this embodiment, 15 beats are available as follows: 1/4, 1/2, 3/4, 1, 5/4, 3/2, 7/4, 2, 9/4, 5/2, 11/4, 13/4, 7/2 and 15/4. ROM The mask ROM stores the tempo, tone and rhythm data. The ROM sends these data to respective generators so as to control the tempo of each song, the tone codes and the rhythm codes. LED Blinking The blinking of the light emitting diode (LED) is matched with rhythm of the melody. Envelope Circuit The envelope circuit made the melody and accompanement output MTO decreases exponentially. Pre-Amplifier The Pre-Amplifier together with external P-N-P and N-P-N transistors works as audio- amplifier. In application modulated tone signal MTO should be connect to the input MI1 of the pre-amplifier through capacitor. Feedback resistor must be connected to obtain the proper bias for the pre-amplifier stage. In the standby state the pre-amplifier is disabled, and OP1 is pulled up to VSS ; OP2 is pulled down to VCC. The Output Buffer The Output Buffer amplifies signal from input MI2 and establishes two output signals BD, BDN for directly drive piezo buzzer. |
Nº de peça semelhante - IZ8057 |
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Descrição semelhante - IZ8057 |
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