HT2844 4-Sound Generator Features • • • • • • • Single power supply: 2.4V~3.3V Low standby current: 1µA (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 × 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 Unit: mil Pad No. X Y Pad No. X Y 1 2 3 4 5 6 7 –33.53 –33.53 –33.53 –33.53 –16.96 –7.43 2.51 27.05 18.30 10.22 –14.34 –27.04 –27.04 –27.04 8 9 10 11 12 13 14 12.45 22.40 33.62 33.62 33.62 –17.17 –24.86 –27.04 –27.04 5.72 18.38 27.05 27.05 27.05 Pin Description Pin No. Pin Name I/O Description 1 TEST2 I/O For IC test only 2 VDD — Positive power supply 3 NC — No connection 4 NC — No connection 5 OUT O Sound output 6 OUT O Sound output, out of phase to pin 5 7 VSS — Negative power supply, GND 8 TEST1 I For IC test only 9 TEST3 I/O For IC test only 10 OSC2 O Oscillator output 11 OSC1 I Oscillator input 2 11th July ’97 HT2844 Pin No. Pin Name I/O Description 12 KEY1 I KEY1 input, low active 13 KEY2 I KEY2 input, low active 14 KEY3 I KEY3 input, low active 15 KEY4 I KEY4 input, low active 16 LED O LED flash output Absolute Maximum Ratings* Supply Voltage ................................. –0.3V to 5V Storage Temperature................. –50°C to 125°C Input Voltage.................... VSS–0.3 to VDD+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. (Ta=25°C) Electrical Characteristics Symbol Parameter Test Conditions VDD Conditions Min. Typ. Max. Unit VDD Operating Voltage — — 2.4 3 3.3 V ISTB Standby Current 3V — — 1 5 µA IDD Operating Current 3V No load — 300 600 µA IOH OUT Source Current 3V VOH=2.5V –1 –2 — mA IOL OUT Sink Current 3V VOL=0.5V 1 2 — mA ILED LED Source Current 3V VOL=2.5V –1 –2 — mA FOSC Oscillator Frequency — R=220kΩ — 128 — kHz VIH “H” Input Voltage 3V — 2.4 — — V VIL “L” Input Voltage 3V — — — 0.6 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 This datasheet has been downloaded from: www.EEworld.com.cn Free Download Daily Updated Database 100% Free Datasheet Search Site 100% Free IC Replacement Search Site Convenient Electronic Dictionary Fast Search System www.EEworld.com.cn All Datasheets Cannot Be Modified Without Permission Copyright © Each Manufacturing Company