HT2844

( DataSheet : www.DataSheet4U.com ) 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 www.DataSheet4U.com www.DataSheet4U.com 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 o...