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PDF SM1350AAQM Data sheet ( Hoja de datos )
| Número de pieza | SM1350AAQM | |
| Descripción | High Tone Quality Melody IC | |
| Fabricantes | NPC | |
| Logotipo |  |
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SM1350AAQM
High Tone Quality Melody IC
OVERVIEW
The SM1350AAQM is single-chip high tone quality melody IC, fabricated using NPC’s Molybdenum-gate CMOS
process. Melodies are selected in serial or binary (parallel) mode, 6 programmable melodies are stored, and the high
tone quality melody is output by how to specify the user. It is making this IC ideal for mechanical clocks and similar
applications where high tone quality output is demanded.
FEATURES
■ Basic Functions
• 4.0MHz oscillator frequency
• Power-save function
- Oscillator stopped when no output
- S0 to S3, MODE, LH pull-up resistors open
• A-class output
• Chattering prevention circuit (STN, STOP, S0 to S3)
• 10-bit D/A converter current-summing
■ Sound Generator Functions
• DWS (dual wave synthesis) sound generators
• 4 simultaneous sounds for 4 tones
■ Melody Functions
• 6 programmable melodies
• Level hold/one-shot melody modes
• Serial/binary (parallel) select modes
■ Control Signal Outputs
• BUSYN signal : LOW during melody output
• CT signal : pulse output synchronizing with selected
notes or rests
PINOUT
(Top view)
VDD
S0
S1
S2
S3
MODE
LH
STOP
STN
BUSYN
CT
ICN
1
12
24 XT
XTN
TO
T3N
T2N
T1N
ENDN
EBUSYIN
SP
SPN
VOL
13 VSS
PACKAGE DIMENSIONS
(Unit : mm)
■ 2.4 to 5.5V supply voltage
■ Molybdenum-gate CMOS
■ Package : 24-pin SSOP
ORDERING INFOMATION
Device
SM1350AAQM
Package
24 pin SSOP
SEIKO NPC CORPORATION - 1
1 page  
SM1350AAQM
DC Characteristics
Ta=25C,VDD=3.0V or 5.0V,VSS=0V,fO=4.0MHz unless otherwise noted.
Parameter
Pin Name Symbol
Condition
Rating
Unit
MIN TYP MAX
Minimum operating supply voltage*1
Maximum operating supply voltage*1
VDD,VSS
VDD,VSS
VMIN
VMAX
2.4 V
5.5 V
Standby current consumption
Operating current consumption
VDD
VDD
ISTBY
IDD
No melody output
BUSYN,CT,TO,
SP,SPN,ENDN,
open
VDD=3.0V
VDD=5.0V
1.0 µA
3.5
mA
9.5
HIGH-level input voltage
LOW-level input voltage
HIGH-level input current
LOW-level input current
HIGH-level output current1
LOW-level output current1
S0～S3,MODE,
LH,STOP,STN,
ICN,EBUSYIN
VIH
VIL
S0～S3,MODE,
LH,STOP,STN,
ICN,EBUSYIN
IIH
IIL
BUSYN,CT,TO
IOH1
IOL1
VDD-0.3
VDD
V
VIH=VDD
VIL=VSS
VDD=3.0V
VDD=5.0V
VDD=3.0V
VDD=5.0V
VOH1=VDD-0.7
VOL1=VSS+0.7
VSS
2.0
2.0
VSS+0.3 V
1
µA
1
10 20
µA
30 50
mA
mA
HIGH-level output current2
LOW-level output current2
ENDN
IOH2
IOL2
VOH2=VDD-0.7
VOL2=VSS+0.7
3.0
3.0
mA
mA
Output current3*2
SP,SPN
IOH3
VOH3=VSS+0.7
VDD=3.0V
VDD=5.0V
4.0
mA
7.7
*1. Supply voltage ratings shown are with oscillator running and all functions operating normally.
*2. Output current when 20kΩ volume control resistor is connected to VOL, and all D/A converter bits ON, measured using the
following circuit.
VDD
SP,SPN
A
VDD VOL
20kΩ
0.7V
VSS
SEIKO NPC CORPORATION - 5
5 Page 
SM1350AAQM
The melody selection in serial mode is controlled by S0 and S1 as shown in the following table. The states of S0 and S1
are read in immediately after startup and the change of S0 and S1 during melody output is invalid.
S1
LOW
HIGH
HIGH
STN
S0 Melody counter
- Increments when melody output stops
LOW
No increment
HIGH
Increments when melody output starts
Stable 1. S0, S1 resistor and melody counter
S1
S0
Selection Counter
#N
#N+1
#N+2
#N+2
Melody Output
(SP pin)
#N
#N+1
#N+2
#N+2
Figure 10. S0, S1 melody output control timing
STOP pin
One-shot output mode stops when STOP goes from HIGH to LOW. The STOP input is ignored in level hold output
mode and is also ignored in one-shot mode when STN is LOW. Note that even when STOP is LOW, STN has higher
priority.
CT pin
A pulse in sync with selected notes or rests is output on CT. 16.4ms pulse is output when a note or rest occurs for which
the corresponding CT data in score ROM is set to 1.
q e e q.
eq
CT DATA 1
10 1
10
CT
Figure 11. CT pulse mode output
Fast Damping
When melody output stops, the D/A converter output amplitude dose not fall to zero instantaneously, instead the output
converges to zero within a maximum of 8.2ms to prevent noise being generated. Also, when one-shot melody output
mode is retriggered, melody output restarts after the fast damping interval. When melody out is stopped by ICN input, it
instantaneously becomes 0 level.
STOP
Melody Output
(SP pin)
Figure 12. Fast damping timing
8.2msec
SEIKO NPC CORPORATION - 11
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