UM66TXXL series Musical IC

MELODY INTEGRATED CIRCUIT

DESCRIPTION
The   UTC   UM66TXXL   series   are   CMOS   LSI designed for using in door bell,  telephone  and toy
application.  It  is  an  on-chip  ROM  programmed  for musical     performance.     Produced     by     CMOS
technology,  the  device  results  in  very  low  power consumption.   Since   the   UTC   UM66TXXL   series
include oscillation circuits a compact melody module can   be   constructed   with   only   a   few   additional
components.

FEATURES

• 64-Note Rom memory consumption
• Dynamic speaker can be driven with external NPN transistor
• OSC resistor hold mode
• Power on reset: melody begins from the first note
• Built in level hold mode

FUNCTIONAL DESCRIPTION

OSCILLATOR CIRCUIT
The oscillator frequency is used as a time for tone and beat generators. Its accuracy affects the quality of the music.


TONE GENERATOR
Tone Frequencies are oscillator frequencies-M, where m is any even number from 64 to 256. Within a melody
14C scales can be selected including Pause code and End code. The tone generator is a programmed divider, The Range of Scales is from “C4” to “C6” and range of frequency varies from 258Hz to 23768Hz.

RHYTHM GENERATOR
The rhythm generator is also programmed dividers. It contain 15 available rhythms as
follows:1/4,1/2,3/4,1,1-1/4,1-1/2,1-/3/4,2,2-1/4,2-1/2,2-/3/4,3,3-1/4,3-1/2,3-/3/4.Four rhythms can be selected from these.

MELODY ROM
The Mask Rom can memorize 64 notes with 6 bit.4 bits are used for controlling the scale code and 2 bits are used for controlling the rhythm code.

TEMPO GENERATOR
There are 15 available tempos in the UTC UM66T series. The 15 tempos are:128,137,148,160,175,192,213, 240 , 274, 320,480,640,960,1920 J/minute.

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