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| HT2844 4-Sound Generator Features * * * Single power supply: 2.4V~3.3V Low standby current: 1A (Typ.) at VDD= 3V Auto power-off function * * * * Eight different sound sections Speaker or direct piezo application LED flash drive output Minimal external components General Description The HT2844 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 various sounds including rifle fire, machine gun, booming, door bell, Alarm, and so forth. Customer's supplied sound source can be analyzed and programmed into an internal ROM by changing a mask layer during device fabrication. The HT2844 is suitable for various toy applications. Pin Assignment Pad Assignment Chip size: 81 x 67 (mil)2 * The IC substrate should be connected to VDD in the PCB layout artwork. 1 11th July '97 HT2844 Block Diagram Pad Coordinates Pad No. 1 2 3 4 5 6 7 Unit: mil X -33.53 -33.53 -33.53 -33.53 -16.96 -7.43 2.51 Y 27.05 18.30 10.22 -14.34 -27.04 -27.04 -27.04 Pad No. 8 9 10 11 12 13 14 X 12.45 22.40 33.62 33.62 33.62 -17.17 -24.86 Y -27.04 -27.04 5.72 18.38 27.05 27.05 27.05 Pin Description Pin No. 1 2 3 4 5 6 7 8 9 10 11 Pin Name TEST2 VDD NC NC OUT OUT VSS TEST1 TEST3 OSC2 OSC1 I/O I/O -- -- -- O O -- I I/O O I For IC test only Positive power supply No connection No connection Sound output Description Sound output, out of phase to pin 5 Negative power supply, GND For IC test only For IC test only Oscillator output Oscillator input 2 11th July '97 HT2844 Pin No. 12 13 14 15 16 Pin Name KEY1 KEY2 KEY3 KEY4 LED I/O I I I I O KEY1 input, low active KEY2 input, low active KEY3 input, low active KEY4 input, low active LED flash output Description Absolute Maximum Ratings* Supply Voltage ................................. -0.3V to 5V Input Voltage.................... VSS-0.3 to VDD+0.3V Storage Temperature................. -50C to 125C Operating Temperature................... 0C to 70C *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. Electrical Characteristics Symbol VDD ISTB IDD IOH IOL ILED FOSC VIH VIL (Ta=25C) Parameter Operating Voltage Standby Current Operating Current OUT Source Current OUT Sink Current LED Source Current Oscillator Frequency "H" Input Voltage "L" Input Voltage Test Conditions VDD -- 3V 3V 3V 3V 3V -- 3V 3V Min. 2.4 -- -- -1 1 -1 -- 2.4 -- Typ. 3 1 300 -2 2 -2 128 -- -- Max. 3.3 5 600 -- -- -- -- -- 0.6 Unit V A A Conditions -- -- No load VOH=2.5V VOL=0.5V VOL=2.5V R=220k -- -- mA mA mA kHz V V 3 11th July '97 HT2844 Timing Diagram 4 11th July '97 HT2844 Application Circuits (HT2844 -- Four Toy Gun Sounds) * Speaker application 5 11th July '97 HT2844 * Piezo application 6 11th July '97 HT2844 Application Circuits (HT2844C -- Four Animal Sounds) * Speaker application 7 11th July '97 HT2844 * Piezo application 8 11th July '97 HT2844 Application Circuits (HT2844M -- Four Helicopter Sounds) * Speaker application 9 11th July '97 HT2844 * Piezo application 10 11th July '97 HT2844 Application Circuits (HT2844N -- Four Racing Car Sounds) * Speaker application 11 11th July '97 HT2844 * Piezo application 12 11th July '97 HT2844 Application Circuits (HT2844P -- Four Jet aircraft Sounds) * Speaker application 13 11th July '97 HT2844 * Piezo application 14 11th July '97 HT2844 Application Circuits (HT2844S -- Four Morning Call Sounds) * Speaker application 15 11th July '97 HT2844 * Piezo application 16 11th July '97 HT2844 Application Circuits (HT2844T -- Four Alarm Sounds) * Speaker application 17 11th July '97 HT2844 * Piezo application 18 11th July '97 |
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