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.

FEATURES

■ 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