RTS903 Datasheet, PDF (1/6 Pages) List of Unclassifed Manufacturers – DUAL-TONE MELODY GENERATOR

RTS903
DUAL-TONE MELODY GENERATOR
Features
Wide operating voltage range: 2.4V to 5.0V
Low Stand-by current
768-note ROM memory
Direct LED drive, where LED flash is programmable.
Typical oscillator frequency: 128 KHz
Built-in digital envelope
1 sequence trigger key
Audio output drives speaker directly.
Power-ON Reset; melody begins from the first note.
General Description
RTS903 is a CMOS LSI designed for toys, doorbells, music boxes, and melody clocks/timers.
It is designed to play pre-programmed melody and is capable of generating dual-tone melody
and natural sounds in piano effect. By pushing the sequence trigger key, all songs are
sequentially selected and played with an Auto -Stop function. In addition, RTS903 provides
PLED and PEN pins to drive LED and the motor. The blinking of LED is programmable to
meet different user applications.
Pin Assignment
Block Diagram
OSCI OSCO
Oscillator
Circuit
Tone
Generator
Modulator
OUT
NC
NC
OUT
PEN
PTB
TRB
NC
NC
1
16
2
15
3
14
4 _RTS90313
5
12
6
11
7
10
8
9
GND
NC
OSCO
OSCI
VDD
PLED
NC
NC
Ripple
Counter
Tempo
Generator
Rhythm
Generator
PEN PLED
ROM
Address
Counter
TRB
PTB
Control
Logic
V2.0
May/12/2002
www.msquaretech.com
Page 6 of 1
The above information is the exclusive intellectual property of M-Square Technologies Corporation and shall not be disclosed, distributed without permission from M-Square.