UM3481
Bowin Microelectronics
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UM3481A Multi-Instrument Melody Generator
Features
• Powered by a 1.5V battery
• Low standby current
• 512-note memory, up to 16 songs
• 8 playing modes by user setting
• One built-in RC oscillator
• 8 beats selectable
• 3 timbres - piano, organ, and mandolin
• 5 tempos available through mask setting
• 14 tones selectable
• On-chip envelope modulator and pre-amplifier
General Description
The UM3481 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
Vdd
Isb
Min.
Typ.
1.5V
Max.
5V
Conditions
No load
Operating Voltage
Stand-by Current
Input Voltage High
Input Voltage Low
Input Current High
Input Current Low
ENV Pin Drive Current
Output Current (OP1)
Output Current (OP2)
1.3V
-
-
12µA
Vdd
Vss+0.3V
Vih
Vil
Vdd-0.3V
Vss
-
-
Iih
Vih=Vdd
Vil =Vss
1.5µA
-
3µA
6µA
0.1µA
-
Iil
-
-
-
-
Ienv
Iol
Venv=0.8V
Vol=0.8V
Voh=0.7V
500µA
200µA
200µA
1200µA
1200µA
Ioh
Playing modes
Mode
CE
0
SL LP
AS
X
0
Program
Standby
0
1
2
3
4
5
6
7
8
X
0
0
0
0
X
0
0
1
1
0
0
1
1
1
First melody→...→Last melody→Stop
1
↑
↑
1
First melody→...→Last melody→Repeat from first melody
Start from the present melody→Stop
Repeat the present melody
0
1
1
0
↑
Change to the next melody→...→Last melody→Stop
Next melody→...→Last melody→Repeat from first melody
Change to the next melody→Stop
1
1
↑
↑
↑
1
0
1
1
Change to the next melody→Repeat the same melody
( ↑ means a low to high voltage level transaction )
BOWIN ELECTRONIC COMPANY
1
www.bowin-ic.com.hk