SM1155 [NPC]
Melody LSIs; 旋律的LSI
| 型号： | SM1155 |
| 厂家： | 
NIPPON PRECISION CIRCUITS INC |
| 描述： | Melody LSIs |
| 文件： | 总7页 (文件大小：76K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SM1155 series
Melody LSIs
NIPPON PRECISION CIRCUITS INC.
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 non-
play 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
PINOUT
(Top view)
ꢀ 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
T2
T1
TC
1
2
3
4
8
7
6
5
ꢀ Wide pitch dynamic range (G to D )
3
7
ꢀ 8-pin SOP package
VDD
TG
OUT
OUT
ORDERING INFORMATION
De vice
Packag e
VSS
SM1155×××1S
SM1155×××2S
SM1155×××3S
8-pin SOP
PACKAGE DIMENSIONS
(Unit: mm)
0.695typ
5.2 0.3
0 to 10
1.27
0.10
0.4 0.1
M
0.12
NIPPON PRECISION CIRCUITS—1
SM1155 s eries
PAD DESCRIPTION
Nu mb e r
Na me
T2
i/o
Function
1
2
–
Test pins (must be open)
Melody mode control input
T1
SM1155×××1S
SM1155×××2S
Level hold 1
Level hold 2
One-shot
1
H
3
TG
ip
SM1155×××3S
L/open
SM1155×××1S/ 2S/ 3S
Non-play
4
5
6
7
8
VS S
OUT
OUT
VDD
TC
–
o
Ground
Piezoelectric speaker driver outputs. Both pins are LOW in non-play mode. OUT is LOW and OUT 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
level.
DD
Test pins (must be open)
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
Parameter
Supply voltage range
Symbol
Condition
Rating
Unit
V
V
−
V
−
0.3 to 5.0
DD
S S
Input voltage range
V
V
−
0.2 to V + 0.2
DD
V
IN
S S
Operating temperature range
Storage temperature range
T
−
20 to 80
°
°
C
C
opr
T
−
55 to 125
stg
Electrical Characteristics
T = 25°C, V = 0V, V = 1.5V
a
SS
DD
Rating
typ
1.5
0.01
25
–
Parameter
Symbol
Condition
Unit
min
1.2
–
ma x
3.6
0.3
50
Operating voltage
V
V
µA
µA
V
DD
1
2
Current consumption
Current consumption
I
Non-play mode
Melody modes: OUT, OUT open
DD1
I
–
DD2
TG LOW -level input voltage
TG HIGH-level input voltage
TG LOW -level input current
TG HIGH-level input current
V
–
V
+ 0.2
IL
S S
V
V
– 0.2
–
–
6.0
6.0
–
V
IH
DD
I
V
V
= 0.4V
= 1.5V
1.4
1.4
2.0
2.0
–20
3.0
3.0
–
µA
µA
mA
mA
%
IL
IL
I
IH
IH
OUT, OUT LOW -level output current
OUT, OUT HIGH-level output current
Internal oscillator frequency
I
V
= 0.75V
= 0.75V
OH
OL
OL
I
V
–
–
OH
f
f
= 50kHz
–
+20
OS C
0
2. Measurement circuit
1. Measurement circuit
VDD
A
VDD
A
1.5V
1.5V
TG
VSS
VSS
NIPPON PRECISION CIRCUITS—2
SM1155 s eries
FUNCTIONAL DESCRIPTION
Melody Modes
When TG goes HIGH (V ), melody play starts.
DD
Level hold 1 (SM1155×××1S)
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 135kΩ
500kΩ
135kΩ
(2-pin parallel resistance)
Level hold 2 (SM1155×××2S)
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
270kΩ
1MΩ
270kΩ
1MΩ
270kΩ
Pull-down resistance
NIPPON PRECISION CIRCUITS—3
SM1155 s eries
One-shot (SM1155×××3S)
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
From the begining
OUT
1 TUNE
1 TUNE
Oscillator
270kΩ 270kΩ
1MΩ 1MΩ
270kΩ
270kΩ
270kΩ
Pull-down resistance
1MΩ
1MΩ
NIPPON PRECISION CIRCUITS—4
SM1155 s eries
Power-save Function
As shown in the preceding timing diagrams, the oscillator stops during non-play mode and the pull-down resis-
tance 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 (I max), does not
IH
exceed 3.3µA.
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 500kΩ when the input is HIGH, and the pull-down resistance is 135kΩ when the input is LOW.
Furthermore, if a light-dependent resistor (CdS) cell is employed as a switch (the pull-down resistance is max-
imum 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
Type
0
ꢀ
ꢆ
1
ꢁ
ꢇ
2
3
ꢃ
ꢈ
4
5
6
7
Note
Res t
ꢁ ꢂ
ꢃ ꢄ ꢀ
ꢃ ꢂ
ꢃ ꢂ ꢂ
ꢅ
ꢇ ꢂ ꢂ
ꢈ ꢄ ꢆ
ꢈ ꢂ
ꢈ ꢂ ꢂ
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
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
ꢃ
=
697
348
232
174
139
116
99.4
87
77.3
69.6
63.3
58
53.5
49.7
46.4
43.5
Pitch and scale
The SM1155 series devices support 3.5 octaves ranging from G to D , from which 15 notes can be selected to
3
7
form a scale.
NIPPON PRECISION CIRCUITS—5
SM1155 s eries
TYPICAL APPLICATION
The circuits below represent the standard connections for SM1155 series devices.
Piezoelectric buzzer
Piezoelectric buzzer
OUT OUT
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 s eries
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 export controls on the distribution or dissemination of the products. Customers shall not export, 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
NIPPON PRECISION CIRCUITS INC.
Telephone: 03-3642-6661
Facsimile: 03-3642-6698
NC0011AE 2000.08
NIPPON PRECISION CIRCUITS—7
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