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SM1155 Datasheet Melody Lsis

Manufacturer: Nippon Precision Circuits Inc

Overview: SM1155 series NIPPON PRECISION CIRCUITS INC. Melody LSIs OVERVIEW The SM1155 series are CMOS melody LSIs that, together with a battery and piezoelectric buzzer, operate in one of 3 melody modes determined by bonding options. They also feature an oscillator stop function in nonplay mode and a variable pull-down resistance function that responds to input levels in order to reduce power consumption, reduce cost, and extend battery life, making them ideal in a wide range of applications including the hold sound for telephones and toys.

General Description

Number 1 2 Name T2 T1 i/o – Test pins (must be open) Melody mode control input S M 1 1 5 5 ×××1 S 3 TG ip 1 H S M 1 1 5 5 ×××2 S S M 1 1 5 5 ×××3 S L/open 4 5 6 7 8 VSS OUT OUT VDD TC – o – – Ground Piezoelectric speaker driver outputs.

Both pins are LOW in non-play mode.

OUT is LOW and O U T is HIGH during output for a musical rest note.

Key Features

  • I I I I I I I I I I Requires few external components 1.2 to 3.6V wide operating voltage range Low power consumption 3 melody modes (bonding option) Oscillator stop function in non-play mode Power saving pull-down resistor built-in RC oscillator circuit Power-ON initialization function Wide pitch dynamic range (G3 to D7) 8-pin SOP package PINOUT (Top view) T2 T1 TG VSS 1 8 TC VDD OUT OUT 55 2 3 4 7 6 5.

SM1155 Distributor

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