multi melody generator IZ8018 1 features ? single-chip cmos construction ? 512x10 bit rom melodies ? internal envelope circuit ? low stand-by current ? single 1.5v operation ? piezo direct drive ? easy to connect with standard watch and clock lsi?s functions ? tempo: 16 kinds ? sound range: 3 octaves (g4-g7) ? serial select mode - total 7 melodies ? play one melody, auto stop ? 32768 khz extarnal clock description the IZ8018 is a cmos multi melody ic. the circuit is composed of a 512-word rom, address counter, tempo and tone generator, address control circuit, envelope signal generator, switch control circuit and tone generator. the IZ8018 has complementary outputs mo, mo for direct piezo drive. since the IZ8018 includes an envelope circuit on the output mo, it can generate good melody sound without any external component for envelope circuit. the IZ8018 can easily be connected to integral?s standard watch chips and designed especially for this target. block diagram figure 1. absolute maximum ratings (ta = 25 o c) characteristic symbol value unit supply voltage v dd - v ss -0.3 ~ 4.0 v input voltage v in v ss - 0.3 ~ v dd + 0.3 v output voltage v out v ss - 0.3 ~ v dd + 0.3 v operating temperature t a - 20 ~ + 75 o c storage temperature t stg - 55 ~ + 125 o c
multi melody generator IZ8018 2 electrical characteristics (t a = 25 o c, v dd = 1.55v, v ss = 0v, unless otherwise specified) characteristic symbol test condition min typ max unit operating voltage v dd 1.25 1.55 3.3 v supply current (stand-by) i dd without load 0.1 0.5 a input high voltage v ih 1.25 v input low voltage v il 0.3 v input current i ih v in =1.55v 0.2 1 10 a i il v in = 0v 0.2 0.05 a i oh v oh = 1.0v mo 100 output current mo 200 a i ol v ol = 0.5v mo 100 mo 200 a rd 1 v oh = 0.7v t 1 17 rd 2 v oh = 0.7v t 2 30 rd 3 v oh = 0.7v t 3 50 output resistor of mo rd 4 v oh = 0.7v t 4 75 k ? rd 5 v oh = 0.7v t 5 110 rd 6 v oh = 0.7v t 6 170 rd 7 v oh = 0.7v t 7 260 rd 8 v oh = 0.7v t 8 450 switch chattering time i ch f = 32768 hz 62.5 ms melody operation the bt8018 can repeat one of any 7 melodies consequently. ? on-hour and confirmation chime the IZ8018 has a 0.75 sec timer circuit to prevent the melody starting by chime sounds of the watch chip and by confirmation chime of chronograph or by signal below 0.75 sec. ? melody start the signals to start the melody are ac or dc signals which are over 0.75 sec after the first signal is given to bdin. the signal under 0.75 sec will put the IZ8018 in standby mode. ? melody stop the melody does not stop until it plays to the end of the melody even if alarm signal is stopped. though the alarm signal is longer that the melody signal the melody does not repeat. if the melody is needs to be stopped midway it can be done by pushing either s 1 or s 2 . melody sound
multi melody generator IZ8018 3 the musical interval of the melody is 400-1500 hz with signal of 50% duty. the standard length of one melody is about 20 s ec. envelope function the IZ8018 has an envelope circuit on the output mo for high tone quality without any external components. the output curr ent will decrease exponentially as show in fig.2. the transistor for amplification would be npn type and has proper h fe in order to keep this waveform. figure 2. application circuit
multi melody generator IZ8018 4 figure 3. pad layout note: pads 2, 3, 4, 5, 11, 12 are 80 ? 80 ? m and provided for wafer?s testing only. in normal operation they should be kept open. figure 4. pad location ( unit: ? m ) pad no. pad name x y description pad no. pad name x y description 1 gnd -735 -710 0v power supply 8 s1 560 -710 start & stop input 2 -572 -710 test 9 v cc 745 -710 power supply 3 -438 -710 test 10 osc in 715 715 oscillator input 4 -302 -710 test 11 440 715 test 5 -170 -710 test 12 300 715 test 6 bdin 50 -710 trigger signal input 13 mo -515 715 direct piezo driver IZ8018 iz5190b IZ8018
multi melody generator IZ8018 5 7 s2 255 -710 start & stop input 14 mo -715 715 env melody output/ direct pieso driver * pins s 1 , s 2 pulled down to v ss by internal resistors. song list no. IZ8018 1 home sweet home 2 oh! susanna 3 whispering hope 4 dreaming of home and mother 5 oh! my darling clementine 6 beautiful dreamer 7 red river valley
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