Datasheet SM1125 Datasheet (NPC)

SM1125 series

NIPPON PRECISION CIRCUITS INC.

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

■

Maximum of 16 melody selections (with up to 512
steps)

■

Level hold playback mode

■

External reference clock input versions and built­in RC oscillator versions available, set by master­slice option (RC oscillator versions require an
external resistor and capacitor).

■

12 selectable clock frequencies (fixed for all melo­dies)

• 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

■

2-pin serial data melody selection and 1-pin mel­ody playback control

■

Power save function

• External clock input versions
Clock gating in no-play modes

• Built-in RC oscillator versions
Oscillator stopped in no-play modes

■

8-pin plastic VSOP package

■

Molybdenum-gate CMOS process

Multimelody IC for Pagers

PINOUT

8-pin VSOP

PACKAGE DIMENSIONS

Unit: mm

OSC

SI
SC
ST

(Top View)

0.575 TYP

0.65

1
2
3
4

0.10

0.22 0.1

1125××

3.1 0.3

6.4 0.3

4.4 0.2

1.15 0.05

0.1 0.05

+

0.12

0.15

8
7
6
5

+ 0.1

− 0.05

M

VSS
VDD
MTO
TEST

0.5 0.2

ORDERING INFORMATION

DEVICE PACKAGE

SM1125 ×× V

1. ×× is v ersion name.

1

8pin VSOP

NIPPON PRECISION CIRCUITS—1

BLOCK DIAGRAM

SM1125 series

OSC

SI

SC

ST

PIN DESCRIPTION

OSC

Gate

Divider

Control

Circuit

Tempo Latch

Tempo Counter

master slice

SW1

1/128

Rhythm
Counter

1/2 or 1/4

Scale

Counter

Scale

ROM

Main

ROM

Multi-

Plexer

Address

Counter

Address

Latch

SW2

VSS

VDD

MTO

TEST

(Pull-down resistance
built-in)

Start

Number Name I/O Function

1 OSC I

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

Built-in RC oscillator option: External resistor and capacitor connection pins
External clock input option: External reference clock input (gate circuit b uilt-in)

NIPPON PRECISION CIRCUITS—2

−

−

−

−

°

°

−

° C

−

SPECIFICATIONS

Absolute Maximum Ratings

Parameter Symbol Condition Rating Unit

Supply voltage range V
Input voltage range V
Power dissipation P
Storage temperature range T
Soldering temperature T
Soldering time t

Recommended Operating Conditions

V

= 0 V

SS

DD

VSS

IN

D

stg

sld

sld

−

SM1125 series

∆

0.3 to 5.0 V

V

SS

0.2 to V

+ 0.2 V

DD

100 mW

40 to 125

255

C
C

10 s

Parameter Symbol Condition Rating Unit

Supply voltage V
Operating temperature T

DD

opr

DC Characteristics

Unless otherwise noted T

Parameter Symbol Condition

Supply voltage (1) V
Supply voltage (2) V
Current consumption (1) I

Current consumption (2) I

Current consumption (3) I

Input voltage

Input current (1)

Input current (2) I
Open voltage V

Output voltage

Oscillator frequency f

Frequency stability
Oscillator start voltage V
Oscillator stop voltage V

= − 20 to 70 ° C, V

a

External clock input option 1.5 3.0 3.6 V

DD1

Built-in RC oscillator option 2.0 3.0 3.6 V

DD2

Non-playback mode, T

DD1

External clock input option: Playback mode,

DD2

MTO pin open
Built-in RC oscillator option: Playback mode,

DD3

MTO pin open

V

IH

ST, SI, SC and OSC (External clock input
option) pins

V

IL

ST, SI, SC and OSC (External clock input

I

IH1

option) pins, V
ST, SI, SC and OSC (External clock input

I

IL1

option) pins, V
TEST pin, V

IH2

TEST pin – – 0.1 V

OPN

V

MTO pin, I

OH

V

MTO pin, I

OL

Built-in RC oscillator option: NPC test board
measurement, R

OSC

V

= 2.0 to 3.6V

DD

f/f Built-in RC oscillator option – 0.1 – %/0.1V

Built-in RC oscillator option – – 1.6 V

DOB

Built-in RC oscillator option – – 1.6 V

DOS

= 0 V, V

SS

= 25 ° C – – 0.5 µA

a

= V

, T

IH

DD

a

= 0 V , T

= 25 ° C

IL

a

= V

IH

DD

= 1 mA V

OH

= 1 mA V

OL

= 91 k Ω , C

O

= 25 ° C

O

DD

= 200 pF

= 1.5 to 3.6 V

2.0 to 3.6 V
20 to 70

Rating

min typ max

– 25 200 µ A

– 215 600 µA

V

0.2 – V

DD

V

SS

–V

DD

+ 0.2 V

SS

– – 0.5 µA

– – 0.5 µA

– – 200 µA

0.4 – V

DD

SS

–V

DD

+ 0.4 V

SS

34.5 38.4 42.5 k Hz

Unit

V

V

NIPPON PRECISION CIRCUITS—3

AC Characteristics

SM1125 series

Unless otherwise noted T

= − 20 to 70 ° C, V

a

= 0 V, V

SS

Parameter Symbol Condition

OSC pulse cycle t
OSC HIGH-level pulsewidth t
OSC LOW-level pulse width t
OSC pulse rise time t
OSC pulse fall time t
SC pulse cycle t
SC HIGH-level pulsewidth t
SC L OW-level pulsewidth t
SC pulse rise time t
SC pulse fall time t
SI-SC setup time t
SI-SC hold time t

OSC

OWH

OWL

Or

Of

SC

SWH

SWL

Sr

Sf

DS

DH

“OSC input pulse (External clock
input option)” timing

“SC input pulse” timing

“SC-SI serial input pulse” timing

OSC input pulse (External clock input option)

tt

OWH

t

OSC

OWL

= 1.5 to 3.6 V

DD

t

Of

Rating

min typ m ax

5.0 – – µs

2.0 – – µs

2.0 – – µs
– – 200 ns
– – 200 ns

5.0 – – µs

2.0 – – µs

2.0 – – µs
– – 200 ns
– – 200 ns

2.0 – – µs

2.0 – – µs

V

0.9VDD

0.1VDD

t

Or

IH

0.5VDD
V

IL

Unit

SC input pulse

t

SWH

SC-SI serial input pulse

SC

SI

V

IH

IH

0.5VDD
V

IL

0.9VDD

0.1VDD

t

SWL

t

SC

OWL

t

Sf

t

Sr

V

0.5VDD
V

IL

t

DS

t

DH

V

IH

0.5VDD
V

IL

NIPPON PRECISION CIRCUITS—4

FUNCTIONAL DESCRIPTION

Control Functions

Reference clock

SM1125 series

SM1125 series devices are available in external
clock input versions and built-in RC oscillator ver­sions, 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.

Table 1. Reference clock frequencies

Frequency

system

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

Selectable frequencies

In external clock input versions, the external refer­ence 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.

OSC

OSC

ST

OSC

Figure 1. External clock input version: Input during playback mode only

ST

Figure 2. External clock input version: Input during non-playback mode

ST

RC Oscillator

Figure 3. Built-in RC oscillator version

NIPPON PRECISION CIRCUITS—5

Playback control

SM1125 series

→

→

→

→

→

→

→

→

→

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

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.

table 2. The final 4 serial data bits in any input data

SC

ST

MTO

Invalid

SI

Valid
Data

Data

B3 B2 B1 B0

? ?

Pin SC should be LOW when either a LOW-to-HIGH or HIGH-to-LOW transition occurs on pin ST.

Invalid

Data

?? ? ?

Figure 4. Serial data input timing

Serial data selection

Table 2. Serial data melody select

B3 B2 B1 B0 ST Melody B3 B2 B1 B0 ST Melody

LLLLL
LLLHL
LLHLL
LLHHL
LHLLL
LHLHL
LHHLL
LHHHL

SI

#n1 Data #n2 Data

H 1st melody H L L L L → H 9th melody
H 2nd melody H L L H L → H 10th melody
H 3rd melody H L H L L → H 11th melody
H 4th melody H L H H L → H 12th melody
H 5th melody H H L L L → H 13th melody
H 6th melody H H L H L → H 14th melody
H 7th melody H H H L L → H 15th melody
H 8th melody HHHHL

SC

ST

MTO

Melody plays repeatedly when ST is HIGH, and stops immediately when ST goes LOW.

#n1 Play

#n1 Play

#n1 Play #n2 Play

Figure 5. Melody repetition timing

H 16th melody

NIPPON PRECISION CIRCUITS—6

SM1125 series

,

,

Playback timing diagrams

Playback start

Playback starts 128 ± 1 OSC clock cycles after ST goes HIGH.

Invalid

Data

SI

Valid

Data

MSB LSB

SC

ST

OSC

Internal

Clock

MTO

Figure 6. Start timing

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.

128 1 Clock

,,,,

In built-in RC oscillator versions, the oscillator also
stops when ST goes LOW.

ST

OSC

Internal

Clock

MTO

,,,,,,,,,,,,,,,

Figure 7. Stop timing

NIPPON PRECISION CIRCUITS—7

Musical Specifications

SM1125 series

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.

Table 3. Rhythm values

01234567

Note

Rest

xee .q eq . q h

Å ä ä . . g ä g . g

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.

Error calculation:

Output frequency

1200 log

-------------------------------------------------

2

Reference frequency

×

=

1200

Note length (including rests)

Eight rhythm values for notes and rests can be pro­grammed. Also, 2 or more notes can be musically
tied.

! !
! !

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

Output frequency

-------------------------------------------------

log

10

Reference frequency

--------------------------------------------------------------­log

10

×

2

3986.3 log

3986.3 log

≈

5.41 cent

Output frequency

-------------------------------------------------

10

Reference frequency

441.379

-------------------

10

440.000

×≈

×≈

NIPPON PRECISION CIRCUITS—8

SM1125 series

Table 4. Frequency range

Number

(Note) A4 is the following note.

Frequency

divider

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 F 3 170.455 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 F 3 177.124 G#3 202.703 G #3 207.568 C4 259.459
7 175
8 165 0.94 G3 198.594 A#3 227.273 A#3 232.727 D4 290.909

9 156
10 147 0.93 A3 222.912 C4 255.102 C4 261.224 E4 326.531
11 139
12 131 0.42 B3 250.137 D4 286.260 D4 293.130 F#4 366.412
13 124
14 117
15 110 2.89 D4 297.891 F4 340.909 F4 349.091 A 4 436.364
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 G 4 382.653 G4 391.837 B4 489.796
18 93
19 87 8.99 F#4 376.644 A4 431.034 A4 441.379 C#5 551.724
20 83
21 78
22 74
23 69 10.29 A#4 474.899 C#5 543.478 C#5 556.522 F5 695.652
24 66
25 62
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 A 5 872.727
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 G 5 765.306 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
32 41 11.47 G5 799.220 A#5 914.634 A#5 936.585 D6 1170.732
33 39
34 37
35 35
36 33
37 31
38 29 10.95 C#6 1129.931 E 6 1293.103 E6 1324.138 G#6 1655.172
39 28
40 26 0.00 D#6 1260.308 F#6 1442.308 F# 6 1476.923 A#6 1846.154
41 25
42 23 12.26 F6 1424.696 G#6 1630.435 G#6 1669.565 C7 2086.957
43 22
44 21

ú

&

===

Relative

error

(cent)

0.93 F#3 187.246 A3 214.286 A3 219.429 C#4 274.286

1.96 G#3 210.051 B3 240.385 B3 246.154 D#4 307.692

2.21 A#3 235.741 C#4 269.784 C#4 276.259 F4 345.324

4.50 C4 264.258 D#4 302.419 D#4 309.677 G 4 387.097

3.91 C #4 280.068 E4 320.513 E4 328.205 G #4 410.256

6.46 F4 352.344 G#4 403.226 G#4 412.903 C5 516.129

9.52 G4 394.795 A#4 451.807 A#4 462.651 D5 578.313

1.96 G#4 420.103 B4 480.769 B4 492.308 D#5 615.385

10.81 A4 442.811 C5 506.757 C5 518.919 E5 648.649

12.74 B4 496.485 D5 568.182 D5 581.818 F#5 727.273

4.50 C5 528.516 D#5 604.839 D#5 619.355 G 5 774.194

10.79 F#5 744.727 A5 852.273 A5 872.727 C#6 1090.909

1.96 G#5 840.205 B5 961.538 B5 984.615 D#6 1230.769

10.81 A5 885.622 C6 1013.514 C6 1037.838 E6 1297.297

14.62 A#5 936.229 C #6 1071.429 C#6 1097.143 F6 1371.429

12.74 B5 992.970 D6 1136.364 D6 1163.636 F#6 1454.545

4.50 C6 1057.032 D#6 1209.677 D#6 1238.710 G6 1548.387

28.30 D 6 1170.286 F6 1339.286 F6 1371.429 A 6 1714.286

32.09 E6 1310.720 G6 1500.000 G6 1536.000 B6 1920.000

10.79 F#6 1489.455 A6 1704.545 A6 1745.455 C # 7 2181.818

30.25 G6 1560.381 A#6 1785.714 A#6 1828.571 D7 2285.714

A4 (440Hz)

32.768 kHz
system

Frequency

Pitch

(Hz)

+21.84 cent pitch

error

37.5 kHz system 38.4 kHz system 48 kHz system
Frequency

Pitch

44.64 cent pitch
error

(Hz)

Pitch

−

−

−

−

3.58 cent pitch

Frequency

(Hz)

−

−

−

−

−

−

−

−

−

error

Pitch

−

−

−

−

−

−

−

17.26 cent pitch

−

−

error

Frequency

(Hz)

−

−

Reference

Pitch

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

NIPPON PRECISION CIRCUITS—9

SM1125 series

Tempo

There are 29 tempos that can be selected for each melody. The tempo varies with the clock frequency.

Table 5. Tempo range

RO M 32.768 kHz system 37.5 kHz system 38.4 kHz system 48 kHz system

Code

03 4
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
08 9 142.2
09 10 128.0 146.5 150.0
0A 11

0B 12 106.7 122.1 125.0
0C 13
0D 14 91.4

0E 15 85.3 97.7

0F 16 80.0 91.6 93.8

10 17

11 18 71.1 81.4 83.3

12 19 67.4 77.1 78.9 98.7

13 20

14 21 61.0 69.8 71.4 89.3

15 22

16 23 55.7

17 24 53.3 61.0 62.5 78.1

18 25 51.2

19 26 49.2 56.3

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
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

Frequency

divider

Tempo

Prestissimo

Allegro

Moderato

Andante

Adagio

Larghetto

Largo

= Tempo

320.0

Prestissimo

160.0 Presto 183.1 Presto 187.5 234.4

Allegro

116.4 133.2 136.4 170.5

98.5 Moderato 112.7

Andante

75.3 86.2 88.2 110.3

64.0
Adagio

58.2 66.6 68.2 85.2

Larghetto

Largo

= Tempo

366.2

Prestissimo

162.8

Allegro

Moderato

104.6 107.1 133.9

Andante

73.2
Adagio

63.7

Larghetto

58.6 60.0

Largo

= Tempo

375.0

Prestissimo

166.7 208.3

Presto

115.4 144.2

100.0 125.0

75.0 93.8

65.2 81.5

57.7 72.1

Allegro

Moderato

Andante

Adagio

q

q

q

q =

Larghetto

468.8

187.5

156.3

117.2

104.2

75.0

64.7

Quarter note ( q ) 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)

NIPPON PRECISION CIRCUITS—10

TYPICAL APPLICATION

External Clock Input Versions

SM1125 series

1.5V to 3.6V
B +

CONTROLLER

Built-in RC Oscillator Versions

CONTROLLER

2.0 to 3.6V

RO

O

C

OSC
SI

SC
ST

OSC
SI

SC
ST

VSS

V

DD

MTO
TEST

VSS
VDD

MTO
TEST

B +

NIPPON PRECISION CIRCUITS—11

SM1125 series

OSCILLATOR FREQUENCY MEASUREMENT

The measurement circuit below shows a SM1125 ×× V with built-in RC oscillator circuit and external RC oscil­lator components capacitor C

When ST is switched to V
using a frequency counter.

and resistor R

O

, the oscillator starts and outputs a pulse on MTO. The output pulse is counted

DD

.

O

RO

CO

Switch

Note that the board mounting and wiring will marginally affect the output frequency, even for equivalent values for R

SM1125 V

OSC
SI
SC
ST

MTO
TEST

V

VSS

DD

Frequency Counter

and C

O

.

O

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 warr anty that such applications will be suitab le 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: [phone]
Facsimile: 03-3642-6698

NC9628CE 1999.2

NIPPON PRECISION CIRCUITS—12