SM1125 series
NIPPON PRECISION CIRCUITS--1
NIPPON PRECISION CIRCUITS INC.
Multimelody IC for Pagers
OVERVIEW
The SM1125 series are melody ICs fabricated in
NPC's Molybdenum-gate CMOS for use in mobile
telecommunications equipment. A maximum of 16
melodies can be stored in programmable ROM.
FEATURES
s
Maximum of 16 melody selections (with up to 512
steps)
s
Level hold playback mode
s
External reference clock input versions and built-
in RC oscillator versions available, set by master-
slice option (RC oscillator versions require an
external resistor and capacitor).
s
12 selectable clock frequencies (fixed for all melo-
dies)
External clock input versions (12 frequencies)
- 32.768 kHz system: 32.768, 65.536 and
131.072 kHz
- 37.5 kHz system: 37.5, 75.0 and 150.0 kHz
- 38.4 kHz system: 38.4, 76.8 and 153.6 kHz
- 48.0 kHz system: 48.0, 96.0 and 192.0 kHz
Built-in oscillator versions (4 frequencies)
- 38.4 kHz (standard oscillator frequency)
- 32.768 kHz
- 37.5 kHz
- 48.0 kHz
s
2-pin serial data melody selection and 1-pin mel-
ody playback control
s
Power save function
External clock input versions
Clock gating in no-play modes
Built-in RC oscillator versions
Oscillator stopped in no-play modes
s
8-pin plastic VSOP package
s
Molybdenum-gate CMOS process
ORDERING INFORMATION
PINOUT
(Top View)
8-pin VSOP
PACKAGE DIMENSIONS
Unit: mm
D E V I C E
PA C K A G E
SM1125
V
1
1.
is version name.
8pin VSOP
OSC
SI
SC
ST
VSS
VDD
MTO
TEST
1
4
5
6
1125
2
3
7
8
4.4 0.2
6.4 0.3
3.1 0.3
0.65
0.22 0.1
1.15 0.05
0.5 0.2
0.575 TYP
0.15
+
0.1
-
0.05
0.12
+
M
0.10
0.1 0.05
SM1125 series
NIPPON PRECISION CIRCUITS--2
BLOCK DIAGRAM
PIN DESCRIPTION
N u m b e r
N a m e
I/O
Function
1
OSC
I
Built-in RC oscillator option: External resistor and capacitor connection pins
External clock input option: External reference clock input (gate circuit built-in)
2
SI
I
Playback control serial interface data input
3
SC
I
Playback control serial interface clock input
4
ST
I
Playback start/stop control signal input
5
TEST
I
Test input pin. Leave open or tie to VSS. (Pull-down resistance built-in)
6
MTO
O
Playback melody signal output
7
VDD
Supply pin (+)
8
VSS
Ground pin
Gate
1/2 or 1/4
SW2
Divider
1/128
Scale
Counter
Scale
ROM
Tempo Latch
Tempo Counter
Rhythm
Counter
Address
Counter
Start
Address
Latch
Main
ROM
Control
Circuit
OSC
SI
SC
ST
VSS
VDD
MTO
TEST
Multi-
Plexer
OSC
SW1
master slice
(Pull-down resistance
built-in)
SM1125 series
NIPPON PRECISION CIRCUITS--3
SPECIFICATIONS
Absolute Maximum Ratings
Recommended Operating Conditions
V
SS
= 0 V
DC Characteristics
Unless otherwise noted T
a
=
-
20 to 70
C, V
SS
= 0 V, V
DD
= 1.5 to 3.6 V
P arameter
S y m b o l
Condition
Rating
Unit
Supply voltage range
V
DD
-
VSS
-
0.3 to 5.0
V
Input voltage range
V
IN
V
SS
-
0.2 to V
DD
+ 0.2
V
Power dissipation
P
D
100
mW
Storage temperature range
T
stg
-
40 to 125
C
Soldering temperature
T
sld
255
C
Soldering time
t
sld
10
s
P arameter
S y m b o l
Condition
Rating
Unit
Supply voltage
V
DD
2.0 to 3.6
V
Operating temperature
T
opr
-
20 to 70
C
P arameter
S y m b o l
Condition
Rating
Unit
m i n
typ
m a x
Supply voltage (1)
V
DD1
External clock input option
1.5
3.0
3.6
V
Supply voltage (2)
V
DD2
Built-in RC oscillator option
2.0
3.0
3.6
V
Current consumption (1)
I
DD1
Non-playback mode, T
a
= 25
C
0.5
A
Current consumption (2)
I
DD2
External clock input option: Playback mode,
MTO pin open
25
200
A
Current consumption (3)
I
DD3
Built-in RC oscillator option: Playback mode,
MTO pin open
215
600
A
Input voltage
V
IH
ST, SI, SC and OSC (External clock input
option) pins
V
DD
-
0.2
V
DD
V
V
IL
V
SS
V
SS
+ 0.2
V
Input current (1)
I
IH1
ST, SI, SC and OSC (External clock input
option) pins, V
IH
= V
DD
, T
a
= 25
C
0.5
A
I
IL1
ST, SI, SC and OSC (External clock input
option) pins, V
IL
= 0 V, T
a
= 25
C
0.5
A
Input current (2)
I
IH2
TEST pin, V
IH
= V
DD
200
A
Open voltage
V
OPN
TEST pin
0.1
V
Output voltage
V
OH
MTO pin, I
OH
= 1 mA
V
DD
-
0.4
V
DD
V
V
OL
MTO pin, I
OL
= 1 mA
V
SS
V
SS
+ 0.4
V
Oscillator frequency
f
OSC
Built-in RC oscillator option: NPC test board
measurement, R
O
= 91 k
, C
O
= 200 pF
V
DD
= 2.0 to 3.6V
34.5
38.4
42.5
kHz
Frequency stability
f/f
Built-in RC oscillator option
0.1
%/0.1V
Oscillator start voltage
V
DOB
Built-in RC oscillator option
1.6
V
Oscillator stop voltage
V
DOS
Built-in RC oscillator option
1.6
V
SM1125 series
NIPPON PRECISION CIRCUITS--4
AC Characteristics
Unless otherwise noted T
a
=
-
20 to 70
C, V
SS
= 0 V, V
DD
= 1.5 to 3.6 V
OSC input pulse (External clock input option)
SC input pulse
SC-SI serial input pulse
P arameter
S y m b o l
Condition
Rating
Unit
m i n
typ
m a x
OSC pulse cycle
t
OSC
"OSC input pulse (External clock
input option)" timing
5.0
s
OSC HIGH-level pulsewidth
t
OWH
2.0
s
OSC LOW-level pulsewidth
t
OWL
2.0
s
OSC pulse rise time
t
Or
200
ns
OSC pulse fall time
t
Of
200
ns
SC pulse cycle
t
SC
"SC input pulse" timing
5.0
s
SC HIGH-level pulsewidth
t
SWH
2.0
s
SC LOW-level pulsewidth
t
SWL
2.0
s
SC pulse rise time
t
Sr
200
ns
SC pulse fall time
t
Sf
200
ns
SI-SC setup time
t
DS
"SC-SI serial input pulse" timing
2.0
s
SI-SC hold time
t
DH
2.0
s
V
IH
V
IL
0.5V
DD
t
Of
t
Or
OWH
t
t
OSC
t
0.1V
DD
0.9V
DD
OWL
V
IH
V
IL
OWL
0.5V
DD
t
Sf
t
Sr
SWH
t
SWL
t
SC
t
0.1V
DD
0.9V
DD
V
IH
V
IL
0.5V
DD
SC
V
IH
V
IL
0.5V
DD
SI
DS
t
DH
t
SM1125 series
NIPPON PRECISION CIRCUITS--5
FUNCTIONAL DESCRIPTION
Control Functions
Reference clock
SM1125 series devices are available in external
clock input versions and built-in RC oscillator ver-
sions, set by master-slice option. In the case of the
built-in RC oscillator option, an external resistor and
capacitor is required for the oscillator function.
SM1125 series can operate at 12 selectable reference
clock frequencies. All melodies playback at the fixed
speed set by the reference clock frequency. External
clock input versions operate at one of 12 selectable
clock frequencies, as shown in table 1. Built-in RC
oscillator versions operate at one of 4 selectable
oscillator frequencies--32.768 kHz, 37.5 kHz, 38.4
kHz (standard frequency) and 48.0 kHz.
In external clock input versions, the external refer-
ence clock input is used during playback mode only
and is otherwise ignored. If a clock signal is input
when not in playback mode (when ST is LOW), the
gate circuit switches to cutoff the external reference
clock signal from entering the device, preventing
unwanted current flow.
In built-in RC oscillator versions, the oscillator is
stopped when not in playback mode (when ST is
LOW), preventing unwanted current flow.
Table 1. Reference clock frequencies
F r e q u e n c y
s y s t e m
Selectable frequencies
32.768 kHz
32.768 kHz
65.536 kHz
131.072 kHz
37.5 kHz
37.5 kHz
75.0 kHz
150.0 kHz
38.4 kHz
38.4 kHz
76.8 kHz
153.6 kHz
48.0 kHz
48.0 kHz
96.0 kHz
192.0 kHz
Figure 1. External clock input version: Input during playback mode only
Figure 2. External clock input version: Input during non-playback mode
Figure 3. Built-in RC oscillator version
ST
OSC
ST
OSC
ST
OSC
RC
Oscillator
SM1125 series
NIPPON PRECISION CIRCUITS--6
Playback control
The ST pin controls the start of playback. While ST
is HIGH, the melody is played repeatedly, and when
ST goes LOW, playback stops. Melodies are selected
by input serial data on pins SI and SC, as shown in
table 2. The final 4 serial data bits in any input data
string form the valid selection data, and this data is
retained even after playback. If serial data is input
during playback, the data is ignored and playback
continues.
Serial data selection
Pin SC should be LOW when either a LOW-to-HIGH or HIGH-to-LOW transition occurs on pin ST.
Figure 4. Serial data input timing
SI
SC
ST
MTO
?
?
B3 B2 B1 B0
?
?
? ?
Invalid
Data
Valid
Data
Invalid
Data
Table 2. Serial data melody select
B 3
B 2
B 1
B 0
S T
M e l o d y
B 3
B 2
B 1
B 0
S T
M e l o d y
L
L
L
L
L
H
1st melody
H
L
L
L
L
H
9th melody
L
L
L
H
L
H
2nd melody
H
L
L
H
L
H
10th melody
L
L
H
L
L
H
3rd melody
H
L
H
L
L
H
11th melody
L
L
H
H
L
H
4th melody
H
L
H
H
L
H
12th melody
L
H
L
L
L
H
5th melody
H
H
L
L
L
H
13th melody
L
H
L
H
L
H
6th melody
H
H
L
H
L
H
14th melody
L
H
H
L
L
H
7th melody
H
H
H
L
L
H
15th melody
L
H
H
H
L
H
8th melody
H
H
H
H
L
H
16th melody
Melody plays repeatedly when ST is HIGH, and stops immediately when ST goes LOW.
Figure 5. Melody repetition timing
SI
SC
ST
MTO
#n1 Data
#n2 Data
#n1 Play
#n1 Play
#n1 Play
#n2 Play
SM1125 series
NIPPON PRECISION CIRCUITS--7
Playback timing diagrams
Playback start
Playback starts 128 1 OSC clock cycles after ST goes HIGH.
Playback stop
Playback stops immediately when ST goes LOW.
In external clock input versions, the IC internal clock
also stops when ST goes LOW, regardless of whether
or not there is a clock input signal on pin OSC.
In built-in RC oscillator versions, the oscillator also
stops when ST goes LOW.
Figure 6. Start timing
SI
SC
ST
MTO
MSB
LSB
Invalid
Data
Valid
Data
OSC
Internal
Clock
128 1 Clock
,,,,,,
,,,,,,
,,,,,,
Figure 7. Stop timing
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
ST
MTO
OSC
Internal
Clock
SM1125 series
NIPPON PRECISION CIRCUITS--8
Musical Specifications
Maximum program steps
The mask for the built-in ROM can be programmed
with up to a maximum of 512 steps, where each step
represents either a note (sound pitch and length) or a
rest.
Note length (including rests)
Eight rhythm values for notes and rests can be pro-
grammed. Also, 2 or more notes can be musically
tied.
Pitch and scale
SM1125 series devices perform uniform interval
length processing to reduce the error at high pitches.
This maintains the relative phase when the frequency
varies from the input value.
The pitch varies with the clock frequency, as shown
in the frequency listing in table 4.
The frequency variation from the input frequency is
the sum of the relative error, shown in the frequency
table, plus the pitch error.
(Ex) 38.4 kHz system, A4 note
Relative error: 8.99 cent
Pitch error:
-
3.58 cent
Total: +5.41 cent
Error calculation:
Table 3. Rhythm values
0
1
2
3
4
5
6
7
N o t e
R e s t
1200
log
2
Output frequency
Reference frequency
-------------------------------------------------
1200
log
10
Output frequency
Reference frequency
-------------------------------------------------
log
10
2
---------------------------------------------------------------
=
3986.3
log
10
Output frequency
Reference frequency
-------------------------------------------------
3986.3
log
10
441.379
440.000
-------------------
5.41 cent
SM1125 series
NIPPON PRECISION CIRCUITS--9
(Note) A4 is the following note.
Table 4. Frequency range
N u m b e r
F r e q u e n c y
divider
Relative
error
(cent)
32.768 kHz
s y s t e m
37.5 kHz system
38.4 kHz system
48 kHz system
Pitch
F r e q u e n c y
(Hz)
Pitch
F r e q u e n c y
(Hz)
Pitch
F r e q u e n c y
(Hz)
Pitch
F r e q u e n c y
(Hz)
1
247
2.49
C3
132.664
D#3
151.822
D#3
155.466
G3
194.332
2
233
3.50
C#3
140.635
E3
160.944
E3
164.807
G#3
206.009
3
220
2.89
D3
148.945
F3
170.455
F3
174.545
A3
218.182
4
208
0.00
D#3
157.538
F#3
180.288
F#3
184.615
A#3
230.769
5
196
2.88
E3
167.184
G3
191.327
G3
195.918
B3
244.898
6
185
2.87
F3
177.124
G#3
202.703
G#3
207.568
C4
259.459
7
175
-
0.93
F#3
187.246
A3
214.286
A3
219.429
C#4
274.286
8
165
0.94
G3
198.594
A#3
227.273
A#3
232.727
D4
290.909
9
156
-
1.96
G#3
210.051
B3
240.385
B3
246.154
D#4
307.692
10
147
0.93
A3
222.912
C4
255.102
C4
261.224
E4
326.531
11
139
-
2.21
A#3
235.741
C#4
269.784
C#4
276.259
F4
345.324
12
131
0.42
B3
250.137
D4
286.260
D4
293.130
F#4
366.412
13
124
-
4.50
C4
264.258
D#4
302.419
D#4
309.677
G4
387.097
14
117
-
3.91
C#4
280.068
E4
320.513
E4
328.205
G#4
410.256
15
110
2.89
D4
297.891
F4
340.909
F4
349.091
A4
436.364
16
104
0.00
D#4
315.077
F#4
360.577
F#4
369.231
A#4
461.538
17
98
2.88
E4
334.367
G4
382.653
G4
391.837
B4
489.796
18
93
-
6.46
F4
352.344
G#4
403.226
G#4
412.903
C5
516.129
19
87
8.99
F#4
376.644
A4
431.034
A4
441.379
C#5
551.724
20
83
-
9.52
G4
394.795
A#4
451.807
A#4
462.651
D5
578.313
21
78
-
1.96
G#4
420.103
B4
480.769
B4
492.308
D#5
615.385
22
74
-
10.81
A4
442.811
C5
506.757
C5
518.919
E5
648.649
23
69
10.29
A#4
474.899
C#5
543.478
C#5
556.522
F5
695.652
24
66
-
12.74
B4
496.485
D5
568.182
D5
581.818
F#5
727.273
25
62
-
4.50
C5
528.516
D#5
604.839
D#5
619.355
G5
774.194
26
58
10.95
C#5
564.966
E5
646.552
E5
662.069
G#5
827.586
27
55
2.89
D5
595.782
F5
681.818
F5
698.182
A5
872.727
28
52
0.00
D#5
630.154
F#5
721.154
F#5
738.462
A#5
923.077
29
49
2.88
E5
668.735
G5
765.306
G5
783.673
B5
979.592
30
46
12.26
F5
712.348
G#5
815.217
G#5
834.783
C6
1043.478
31
44
-
10.79
F#5
744.727
A5
852.273
A5
872.727
C#6
1090.909
32
41
11.47
G5
799.220
A#5
914.634
A#5
936.585
D6
1170.732
33
39
-
1.96
G#5
840.205
B5
961.538
B5
984.615
D#6
1230.769
34
37
-
10.81
A5
885.622
C6
1013.514
C6
1037.838
E6
1297.297
35
35
-
14.62
A#5
936.229
C#6
1071.429
C#6
1097.143
F6
1371.429
36
33
-
12.74
B5
992.970
D6
1136.364
D6
1163.636
F#6
1454.545
37
31
-
4.50
C6
1057.032
D#6
1209.677
D#6
1238.710
G6
1548.387
38
29
10.95
C#6
1129.931
E6
1293.103
E6
1324.138
G#6
1655.172
39
28
-
28.30
D6
1170.286
F6
1339.286
F6
1371.429
A6
1714.286
40
26
0.00
D#6
1260.308
F#6
1442.308
F#6
1476.923
A#6
1846.154
41
25
-
32.09
E6
1310.720
G6
1500.000
G6
1536.000
B6
1920.000
42
23
12.26
F6
1424.696
G#6
1630.435
G#6
1669.565
C7
2086.957
43
22
-
10.79
F#6
1489.455
A6
1704.545
A6
1745.455
C#7
2181.818
44
21
-
30.25
G6
1560.381
A#6
1785.714
A#6
1828.571
D7
2285.714
+21.84 cent pitch
error
-
44.64 cent pitch
error
-
3.58 cent pitch
error
-
17.26 cent pitch
error
A4 (440Hz)
Pitch
R e ference
frequency
C3
130.8128
C#3
138.5913
D3
146.8325
D#3
155.5635
E3
164.8138
F3
174.6143
F#3
184.9973
G3
195.9978
G#3
207.6525
A3
220.0000
A#3
233.0820
B3
246.9418
C4
261.6255
C#4
277.1825
D4
293.6650
D#4
311.1270
E4
329.6275
F4
349.2285
F#4
369.9945
G4
391.9955
G#4
415.3050
A4
440.0000
A#4
466.1640
B4
493.8835
C5
523.2510
C#5
554.3650
D5
587.3300
D#5
622.2540
E5
659.2550
F5
698.4570
F#5
739.9890
G5
783.9910
G#5
830.6100
A5
880.0000
A#5
932.3280
B5
987.7670
C6
1046.5020
C#6
1108.7300
D6
1174.6600
D#6
1244.5080
E6
1318.5100
F6
1396.9140
F#6
1479.9780
G6
1567.9820
G#6
1661.2200
A6
1760.0000
A#6
1864.6560
B6
1975.5340
C7
2093.0040
C#7
2217.4600
D7
2349.3200
SM1125 series
NIPPON PRECISION CIRCUITS--10
Tempo
There are 29 tempos that can be selected for each melody. The tempo varies with the clock frequency.
Quarter note (
) length = 1536
tempo counter frequency divider clock frequency
(Ex. 1) Tempo code = 1F (divider = 32), clock frequency = 32.768 kHz (32.768 kHz system)
1536
32 32768 = 1.5 (seconds)
(Ex. 2) Tempo code = 18 (divider = 25), CLK frequency = 153.6 kHz (38.4 kHz system)
1536
25 38400 = 1.0 (seconds)
Table 5. Tempo range
R O M
32.768 kHz system
37.5 kHz system
38.4 kHz system
48 kHz system
C o d e
F r e q u e n c y
divider
Te m p o
=
Te m p o
=
Te m p o
=
Te m p o
=
03
4
Prestissimo
320.0
Prestissimo
366.2
Prestissimo
375.0
Prestissimo
468.8
04
5
256.0
293.0
300.0
375.0
05
6
213.3
244.1
250.0
312.5
06
7
Presto
182.9
209.3
214.3
267.9
07
8
Allegro
160.0
Presto
183.1
Presto
187.5
234.4
08
9
142.2
Allegro
162.8
Allegro
166.7
208.3
09
10
128.0
146.5
150.0
Presto
187.5
0A
11
Moderato
116.4
133.2
136.4
170.5
0B
12
106.7
122.1
125.0
Allegro
156.3
0C
13
Andante
98.5
Moderato
112.7
Moderato
115.4
144.2
0D
14
91.4
Andante
104.6
107.1
133.9
0E
15
85.3
97.7
Andante
100.0
125.0
0F
16
80.0
91.6
93.8
Moderato
117.2
10
17
Adagio
75.3
86.2
88.2
110.3
11
18
71.1
81.4
83.3
Andante
104.2
12
19
67.4
77.1
78.9
98.7
13
20
Larghetto
64.0
Adagio
73.2
Adagio
75.0
93.8
14
21
61.0
69.8
71.4
89.3
15
22
Largo
58.2
66.6
68.2
85.2
16
23
55.7
Larghetto
63.7
Larghetto
65.2
81.5
17
24
53.3
61.0
62.5
78.1
18
25
51.2
Largo
58.6
60.0
Adagio
75.0
19
26
49.2
56.3
Largo
57.7
72.1
1A
27
47.4
54.3
55.6
69.4
1B
28
45.7
52.3
53.6
67.0
1C
29
44.1
50.5
51.7
Larghetto
64.7
1D
30
42.7
48.8
50.0
62.5
1E
31
41.3
47.3
48.4
60.5
1F
32
40.0
45.8
46.9
Largo
58.6
SM1125 series
NIPPON PRECISION CIRCUITS--11
TYPICAL APPLICATION
External Clock Input Versions
Built-in RC Oscillator Versions
OSC
SI
SC
ST
V
DD
VSS
MTO
TEST
1.5V to 3.6V
B
+
CONTROLLER
OSC
SI
SC
ST
V
DD
VSS
MTO
TEST
2.0 to 3.6V
B
+
R
O
CONTROLLER
C
O
SM1125 series
NIPPON PRECISION CIRCUITS--12
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: 03-3642-6661
Facsimile: 03-3642-6698
NC9628CE
1999.2
NIPPON PRECISION CIRCUITS INC.
OSCILLATOR FREQUENCY MEASUREMENT
The measurement circuit below shows a SM1125
V with built-in RC oscillator circuit and external RC oscil-
lator components capacitor C
O
and resistor R
O
.
When ST is switched to V
DD
, the oscillator starts and outputs a pulse on MTO. The output pulse is counted
using a frequency counter.
Note that the board mounting and wiring will marginally affect the output frequency, even for equivalent values for R
O
and C
O
.
OSC
SI
SC
ST
V
DD
V
SS
MTO
TEST
R
O
C
O
Switch
Frequency Counter
SM1125 V
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