1
M348x Series
UM348x Multi-Instrument Melody Generator
_____________________________________________________________________________
Features
Powered by a 1.5V battery
8 beats selectable
Low standby current
3 timbres - piano, organ, and mandolin
512-note memory, up to 16 songs
5 tempos available through mask setting
8 playing modes by user setting
14 tones selectable
One built-in RC oscillator
On-chip envelope modulator and pre-amplifier
General Description
The M3481 series is a mask-ROM-programmed multi-instrument melody generator , implemented by
CMOS technology. It is designed to play the melody according to the previously programmed
information
and is capable of generating 16 songs with 3 instrument effects : piano, organ and mandolin. The
device
also includes a pre-amplifier which provides a simple interface to the driver circuit. The M3481 series is
intended for applications such as toys, door bells, music box, melody clock/timers and telephones.
Absolute Maximum Ratings
DC Supply Voltage .......................................... -0.3V to +5.0V
Input Voltage Range ....................................... Vss-0.3V to Vdd+0.3V
Operating Ambient Temperature .................... 0
C to +70
C
Storage Temperature ....................................... -10
C to +125
C
Electrical Characteristics
(Vss=0V, Vdd=1.5V, Ta=25
C, unless otherwise specified.)
Parameter
Symbol
Min.
Typ.
Max.
Conditions
Operating Voltage
Vdd
1.3V
1.5V
5V
Stand-by Current
Isb
-
-
12
A
No load
Input Voltage High
Vih
Vdd-0.3V
-
Vdd
Input Voltage Low
Vil
Vss
-
Vss+0.3V
Input Current High
Iih
1.5
A
3
A
6
A
Vih=Vdd
Input Current Low
Iil
-
-
0.1
A
Vil =Vss
ENV Pin Drive Current
Ienv
500
A
-
-
Venv=0.8V
Output Current (OP1)
Iol
200
A
-
1200
A
Vol=0.8V
Output Current (OP2)
Ioh
200
A
-
1200
A
Voh=0.7V
Playing modes
Mode
CE
SL
LP
AS
Program
0
0
X
X
X
Standby
1
1
0
0
0
First melody
...
Last melody
Stop
2
0
0
1
First melody
...
Last melody
Repeat from first melody
3
0
1
0
Start from the present melody
Stop
4
1
0
1
1
Repeat the present melody
5
1
0
0
Change to the next melody
...
Last melody
Stop
6
1
0
1
Next melody
...
Last melody
Repeat from first melody
7
1
1
0
Change to the next melody
Stop
8
1
1
1
Change to the next melody
Repeat the same melody
(
means a low to high voltage level transaction )
2
Song Series List (Fewer songs version provides longer duration for each song)
M3481 (8 songs)
M3482 (12 songs)
M3485 (5 songs)
Jingle Bells
American Patrol
The Hawaiian Wedding Song
Santa Claus Is Coming To Town
Rabbits
Try To Remember
Silent Night, Holy Night
Oh My Darling, Clementine
Aloha OE
Joy To The World
Butterfly
Love Story
Rudolph, The Red-nosed Reindeer
London Bridge Is Falling Down
Yesterday
We Wish You A Merry Christmas
Row, Row, Row Your Boat
O Come, All Ye Faithful
Are You Sleeping
Hark, The Herald Angels Sing
Happy Birthday
Joy Symphony
Home Sweet Home
Weigenlied
Melody On Purple Bamboo
Pin Configuration
Pin no.
Symbol
Description
1
TSP
Output flag signal of melody auto stop : In normal operation, this should be
open.
2
CE
Chip is enabled if connected to Vdd. Chip is disabled if connected to Vss.
3
LP
Only one song plays if connected to Vdd. All songs play if connected to Vss.
4
SL
A positive going edge will change to play the next song.
5
AS
The melody will repeat if connected to Vdd and will stop automatically if to Vss.
6
NC
No connection
7
ENV
Envelope circuit terminal
8
Vss
Negative power supply
9
MTO
Modulated tone signal output
10
OP1
Pre-amplifier output 1
11
OP2
Pre-amplifier output 2
12
MT1
Modulated tone signal input to the pre-amplifier.
13
NC
No connection
14
OSC2
External oscillator terminal 1
15
OSC1
External oscillator terminal 2
16
Vdd
Positive power supply
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