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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.
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
ORDERING INFORMATION
D e vice S M 1 1 5 5 xxx1 S S M 1 1 5 5 xxx2 S S M 1 1 5 5 xxx3 S 8-pin SOP P ackag e
PACKAGE DIMENSIONS
(Unit: mm)
+ 0. 0.15 - 0. 1 05
4.4 0.2
6.2 0.3
0.695typ 0.05 0.05 5.2 0.3 1.5 0.1 0 to 10
1.27 0.4 0.1
0.10 0.12 M
NIPPON PRECISION CIRCUITS--1
0.4 0.2
SM1155 series
PAD DESCRIPTION
Number 1 2 Name T2 T1 i/o - Test pins (must be open) Melody mode control input S M 1 1 5 5 xxx1 S 3 TG ip 1 H S M 1 1 5 5 xxx2 S S M 1 1 5 5 xxx3 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. Both pins are HIGH during the gap between musical notes. Supply. The rear surface of the chip is V D D level. Test pins (must be open) S M 1 1 5 5 xxx1S/ 2S/ 3S Level hold 1 Level hold 2 One-shot Non-play Function
1. Built-in pull-down resistor (the resistance of the pull-down resistor varies with the applied voltage, as described in the Electrical Characteristics).
SPECIFICATIONS
Absolute Maximum Ratings
P arameter Supply voltage range Input voltage range Operating temperature range Storage temperature range Symbol VDD - VSS V IN T opr T stg Condition Rating -0.3 to 5.0 V S S - 0.2 to V D D + 0.2 -20 to 80 -55 to 125 Unit V V C C
Electrical Characteristics
Ta = 25C, VSS = 0V, VDD = 1.5V
P arameter Operating voltage Current consumption 1 Current consumption 2 T G L OW -level input voltage TG HIGH-level input voltage T G L OW -level input current TG HIGH-level input current O U T, O U T LOW -level output current O U T, O U T HIGH-level output current Internal oscillator frequency 1. Measurement circuit Symbol VDD ID D 1 ID D 2 V IL V IH IIL IIH IO L IO H fO S C V IL = 0.4V V IH = 1.5V V O L = 0.75V V O H = 0.75V f0 = 50kHz Non-play mode Melody modes: O U T, O U T open Condition Rating min 1.2 - - - V D D - 0.2 1.4 1.4 2.0 2.0 -20 2. Measurement circuit typ 1.5 0.01 25 - - 3.0 3.0 - - - max 3.6 0.3 50 V S S + 0.2 - 6.0 6.0 - - +20 Unit V A A V V A A mA mA %
A
VDD
A
VDD
1.5V
VSS
1.5V
TG
VSS
NIPPON PRECISION CIRCUITS--2
SM1155 series
FUNCTIONAL DESCRIPTION
Melody Modes
When TG goes HIGH (VDD), melody play starts. Level hold 1 (SM1155xxx1S) When TG goes HIGH, melody play starts and continues while TG is held HIGH. When TG goes open circuit or LOW, melody play stops, even if during mid melody.
TG
OUT
1 TUNE REPEAT REPEAT
Oscillator
Pull-down resistance 135k (2-pin parallel resistance)
500k
135k
Level hold 2 (SM1155xxx2S) When TG goes HIGH, a single melody play starts. Melody play continues until the single melody ends or TG goes open circuit or LOW, whichever occurs first.
TG
OUT
1 TUNE
Oscillator
Pull-down resistance
270k
1M
270k
1M
270k
NIPPON PRECISION CIRCUITS--3
SM1155 series One-shot (SM1155xxx3S) When TG goes HIGH, a single melody play starts. Melody play continues until the melody ends, even if TG goes open circuit or LOW mid melody. However, if the TG input goes HIGH again during melody play, the melody play restarts from the beginning.
TG
OUT
1 TUNE 1 TUNE
From the begining
Oscillator
Pull-down resistance
270k 1M
270k 1M
270k 270k 1M 1M
270k
NIPPON PRECISION CIRCUITS--4
SM1155 series
Power-save Function
As shown in the preceding timing diagrams, the oscillator stops during non-play mode and the pull-down resistance value changes in response to both HIGH-level and LOW-level inputs (power-save pull-down resistor) to reduce power consumption and extend battery life. Non-play oscillator stop function When melody play ends, regardless of the state of TG, the internal oscillator stops and is placed in a standby state. In this state, the current consumption, including input pin pull-down resistor current (IIH max), does not exceed 3.3A. Power-save pull-down resistor The resistance of the TG input pull-down resistor changes in response to the input voltage. The pull-down resistance is 500k when the input is HIGH, and the pull-down resistance is 135k when the input is LOW. Furthermore, if a light-dependent resistor (CdS) cell is employed as a switch (the pull-down resistance is maximum when the CdS resistance is minimum (light) and the pull-down resistance is minimum when the CdS resistance is maximum (dark)), the combined resistance can be increased, decreasing current consumption.
Musical Specifications
Maximum program steps A maximum of 64 steps can be programmed into internal mask-programmable ROM. Each step represents either a note (sound pitch and length), a rest note, or a jump. The maximum number of jumps is 7. Note length (including rests) Eight rhythm values, from sixteenth note to half note, for notes and rests can be programmed, as shown in the following table.
Code Ty p e 0 Note Rest 1 2 3 4 5 6 7
Also, notes and rests longer than half notes and rests can be created using a tie to connect the notes. This requires 2 program steps in ROM. Tempo The tempo for the standard quarter note can be selected from the following 16 options.
Code = 0 697 1 348 2 232 3 174 4 139 5 116 6 99.4 7 87 8 77.3 9 69.6 A 63.3 B 58 C 53.5 D 49.7 E 46.4 F 43.5
Pitch and scale The SM1155 series devices support 3.5 octaves ranging from G3 to D7, from which 15 notes can be selected to form a scale.
NIPPON PRECISION CIRCUITS--5
SM1155 series
TYPICAL APPLICATION
The circuits below represent the standard connections for SM1155 series devices.
Piezoelectric buzzer OUT OUT
Piezoelectric buzzer OUT OUT
VDD
Light
VDD
TG
VSS
TG
VSS
Circuit 1
Circuit 3
Piezoelectric buzzer OUT OUT
VDD
TG
VSS
Circuit 2
NIPPON PRECISION CIRCUITS--6
SM1155 series
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with expor t controls on the distribution or dissemination of the products. Customers shall not expor t, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698
NC0011AE 2000.08
NIPPON PRECISION CIRCUITS INC.
NIPPON PRECISION CIRCUITS--7

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