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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
µA
No load
Input Voltage High
Vih
Vdd-0.3V
-
Vdd
Input Voltage Low
Vil
Vss
-
Vss+0.3V
Input Current High
Iih
1.5
µA3µA6µA
Vih=Vdd
Input Current Low
Iil
-
-
0.1
µA
Vil =Vss
ENV Pin Drive Current
Ienv
500
µA
-
-
Venv=0.8V
Output Current (OP1)
Iol
200
µA
-
1200
µA
Vol=0.8V
Output Current (OP2)
Ioh
200
µA
-
1200
µA
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 )
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