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ht2812 single sound generator pin assignment block diagram general description the ht2812 is a cmos lsi chip designed for use in sound effect products. it is equipped with tone circuit, noise circuit, and other control logic to generate different sounds including rifle gun, machine gun, booming sound, door bell, alarm etc. the customer supplied sound source can be analyzed and programmed into an inter- nal rom by changing a mask layer during de- vice fabrication. the ht2812 is suitable for various toy applications. features single power supply: 2.4v~3.3v low standby current at 3v, 1 m a (typ.) auto power-off function speaker or direct piezo application built-in envelope control circuit 1hz~8hz programmable led flash output minimum external components 1 10th july 97
pad coordinates unit: mil pad no. x y 1 C27.127 32.3 2 C27.127 C32.3 3 C10.127 C32.3 4 C2.307 C32.3 5 8.488 C32.3 6 16.138 C32.3 7 27.528 C32.3 8 27.528 C24.65 9 27.528 32.3 10 19.878 32.3 11 12.228 32.3 12 4.578 32.3 chip size : 67 72 (mil) 2 * the ic substrate should be connected to vdd in the pcb layout artwork. absolute maximum ratings* supply voltage ................................ C0.3v to 5v storage temperature................. C50 c to 125 c input voltage ................... v ss C0.3 to v dd +0.3v operating temperature .................. 0 c to 70 c *note: stresses above those listed under absolute maximum ratings may cause permanent damageto the device. these are stress ratings only. functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied and exposure to absolute maximum rating conditions for extended periods may affect device reliability. ht2812 2 10th july 97
electrical characteristics (ta=25 c) symbol parameter test conditions min. typ. max. units v dd conditions v dd operating voltage 3v 2.4 3 3.3 v i stb standby current 3v 1 5 m a i dd operating current 3v no load 300 600 ma i oh output source current 3v v oh =2.5v C1 C2 ma i ol output sink current 3v v ol =0.5v 1 2 ma i env env source current 3v v oh =2.5v C1 C2 ma i led led source current 3v v oh =2.5v C1 C2 ma f osc oscillator frequency r=330k w 64 khz v ih h input voltage 3v 2.4 v v il l input voltage 3v 0.6 v pad description pad no. pad name i/o description 1 vss negative power supply, gnd 2 out o sound output pad, out of phase to pad 3 3 out o sound output pad 4 env o sound envelope control pad 5 test3 i for ic test only 6 led o led flash output pad 7 vdd positive power supply 8key i key input pad, low active 9 osc2 o oscillator output pad 10 osc1 i oscillator input pad 11 test1 i for ic test only 12 test2 i for ic test only ht2812 3 10th july 97
timing diagram with an envelope no envelope ht2812 4 10th july 97
application circuits speaker output with an envelope ht2812 5 10th july 97
speaker output without an envelope ht2812 6 10th july 97
piezo output without an envelope ht2812 7 10th july 97
hand touch trigger ht2812 8 10th july 97
application circuit (ht2812a airplane) ht2812 9 10th july 97
application circuit (ht2812b rocket) ht2812 10 10th july 97
application circuit (ht2812c siren ii) ht2812 11 10th july 97
application circuit (ht2812d police car) ht2812 12 10th july 97
application circuit (ht2812e fire brigade) ht2812 13 10th july 97
application circuit (HT2812F siren i) ht2812 14 10th july 97
application circuit (ht2812h dialing tone) ht2812 15 10th july 97
application circuit (ht2812j chicken sound) ht2812 16 10th july 97
application circuit (ht2812k ambulance sound) ht2812 17 10th july 97

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