CF1156 series
NIPPON PRECISION CIRCUITS INC.--1
Melody LSIs
OVERVIEW
The CF1156 series are CMOS melody LSIs with built-in LED driver that, together with a battery and piezo-
electric buzzer, operate in one of 3 melody modes determined by input level or bonding options. They also fea-
ture 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 greeting cards and toys.
FEATURES
I
LED direct drive
I
Requires few external components
I
2.0 to 3.6V wide operating voltage range
I
Low power consumption
I
3 melody modes (bonding option)
I
Oscillator stop function in non-play mode
I
Power saving pull-down resistor built-in
I
RC oscillator circuit
I
Power-ON initialization function
I
2 V
SS
pad connections
I
Wide pitch dynamic range (G
3
to D
7
)
I
Chip form
PAD LAYOUT and COORDINATES
(Unit:
m)
ORDERING INFORMATION
Chip size: 1.23
1.23mm
Chip thickness: 300 30m
T1, T2, TC, and TO bonding is not required.
VDD
(0,0)
(1230,1230)
1
HA1156
2
3
4
5
6
7
8
9
10
11
LO
BO
TC
T2
T1
VSS TO OSH
LH
VSS
Number
Pad
X
Y
1
BO
930
1075
2
LO
529
1075
3
VDD
155
1075
4
TC
155
887
5
T2
155
608
6
T1
155
420
7
VSS
223
155
8
TO
486
155
9
OSH
750
155
10
LH
1041
155
11
VSS
1075
420
Device
Package
CF1156
Chip form
CF1156 series
NIPPON PRECISION CIRCUITS INC.--2
PAD DESCRIPTION
SPECIFICATIONS
Absolute Maximum Ratings
Electrical Characteristics
T
a
= 25
C, V
SS
= 0V, V
DD
= 3.0V
Name
Function
OSH, LH
Melody mode control inputs. Built-in pull-down resistors mean LOW-level signals are obtained when inputs are open circuit. The
resistance of the pull-down resistor varies with the applied voltage, as described in the Electrical Characteristics.
LO
LED drive output, HIGH level during non-play mode.
BO
Piezoelectric speaker driver output. LOW level output during non-play mode and during musical rest notes. HIGH level output
during gaps between melody notes.
VDD
Supply. The rear surface of the chip is V
DD
level.
VSS
Ground
T1, T2, TC
Test inputs. Pull-down resistor built-in.
TO
Test output. The oscillator frequency (typ. 50kHz) is output for monitoring purposes.
Parameter
Symbol
Condition
Rating
Unit
Supply voltage range
V
DD
-
V
SS
-
0.3 to 5.0
V
Input voltage range
V
IN
V
SS
-
0.2 to V
DD
+ 0.2
V
Operating temperature range
T
opr
-
20 to 80
C
Storage temperature range
T
stg
-
65 to 150
C
Parameter
Symbol
Condition
Rating
Unit
min
typ
max
Operating voltage
V
DD
2.0
3.0
3.6
V
Current consumption
1
1. Measurement circuit
I
DD1
Non-play mode
0.01
0.6
A
Current consumption
2
I
DD2
Melody modes: BO, LO open
100
200
A
LH, OSH LOW-level input voltage
V
IL
V
SS
+ 0.2
V
LH, OSH HIGH-level input voltage
V
IH
V
DD
0.2
V
LH, OSH LOW-level input current
I
IL
V
IL
= 0.8V
0.7
9.0
18
A
LH, OSH HIGH-level input current
I
IH
V
IH
= 3.0V
0.7
9.0
18
A
BO LOW-level output current
I
OL1
V
OL
= 1.0V
4.0
mA
BO HIGH-level output current
I
OH1
V
OH
= 2.0V
4.0
mA
LO LOW-level output current
I
OL2
V
OL
= 1.0V
10
mA
LO HIGH-level output current
I
OH2
V
OH
= 2.0V
8
mA
TO oscillator frequency
f
OSC
35
50
65
kHz
TO oscillator start voltage
V
DOB
2.0
V
TO oscillator stop voltage
V
DOS
2.0
V
VDD
VSS
A
3.0V
2. Measurement circuit
VDD
LH
VSS
A
3.0V
CF1156 series
NIPPON PRECISION CIRCUITS INC.--3
FUNCTIONAL DESCRIPTION
LED Indicator
The LED flashes during melody play mode only, at intervals representing a 1/8 musical note length.
Melody Modes
The CF1156 series melody mode is determined by the bonding options and levels on the mode control inputs
OSH and LH. When either OSH or LH or both go HIGH (V
DD
), the corresponding melody mode is selected as
shown in the following table.
Level hold 1
When both OSH and LH go HIGH, melody play starts and continues while both are held HIGH. When both
inputs go open circuit or LOW, melody play stops, even if during mid melody.
Note that both OSH and LH inputs should be switched simultaneously using a single switch. If there is timing
difference between the two inputs, then LH has priority.
OSH
LH
Melody mode
HIGH
HIGH
Level hold 1
LOW
HIGH
Level hold 2
HIGH
LOW
One-shot
LOW
LOW
Non-play
= 1 cycle
BO
LED flash
LED flash interval
LO
Play
Non-play
V
DD
Active:LOW
V
SS
The LED flashes at intervals equal to a 1/8 musical note,
regardless of the melody note length being output.
Note:
1 TUNE
Oscillator
REPEAT
REPEAT
BO
LH
OSH
150k
45k
45k
Pull-down resistance
(2-pin parallel resistance)
CF1156 series
NIPPON PRECISION CIRCUITS INC.--4
Level hold 2
When LH goes HIGH, a single melody play starts. Melody play continues until the single melody ends or LH
goes open circuit or LOW, whichever occurs first.
One-shot
When OSH goes HIGH, a single melody play starts. Melody play continues until the melody ends, even if OSH
goes open circuit or LOW mid melody. However, if the OSH input goes HIGH again during melody play, the
melody play restarts from the beginning.
1 TUNE
Oscillator
BO
LH
300k
90k
Pull-down resistance
90k
300k
90k
1 TUNE
Oscillator
BO
OSH
300k
90k
Pull-down resistance
90k
300k
90k
1 TUNE
90k
90k
From the begining
300k
300k
CF1156 series
NIPPON PRECISION CIRCUITS INC.--5
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 either LH or OSH, 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
IH
max), does not exceed 18.6A.
Power-save pull-down resistor
The resistance of the OSH and LH input pull-down resistor changes in response to the input voltage. The pull-
down resistance is 300k
when the input is HIGH, and the pull-down resistance is 90k
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.
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.
Pitch and scale
The CF1156 series devices support 3.5 octaves ranging from G
3
to D
7
, from which 15 notes can be selected to
form a scale.
Type
Code
0
1
2
3
4
5
6
7
Note
Rest
Code
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
=
697
348
232
174
139
116
99.4
87
77.3
69.6
63.3
58
53.5
49.7
46.4
43.5
CF1156 series
NIPPON PRECISION CIRCUITS INC.--6
TYPICAL APPLICATION
The circuits below represent the standard connections for CF1156 series devices.
Note 1: There are 2 V
SS
pads, and either pad can be used.
Note 2: Circuit 1 is for one-shot mode, circuit 2 for level hold 1/2 modes, and circuit 3 for CdS connection.
The bonding options for the above circuits is shown in the following table.
Circuit 1
Circuit 2
LO
VSS
VDD
BO
OSH
LH
VSS
LO
VSS
VDD
BO
OSH
LH
VSS
Circuit 3
LO
VSS
VDD
BO
OSH
LH
VSS
Light
CdS
OSH
LH
Melody mode
Yes
Yes
Level hold 1
Yes
Level hold 2
Yes
One-shot
CF1156 series
NIPPON PRECISION CIRCUITS INC.--7
NC0002BE
2001.06
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
Telephone: +81-3-3642-6661
Facsimile: +81-3-3642-6698
http://www.npc.co.jp/
Email: sales
@
npc.co.jp
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