UM3481
Bowin Microelectronics
_________________________________________________________
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
Min.
Typ.
Operating Voltage
Vdd
1.3V
1.5V
Stand-by Current
Isb
-
-
Input Voltage High
Vih
Vdd-0.3V
-
Input Voltage Low
Vil
Vss
-
Input Current High
Iih
1.5µA
3µA
Input Current Low
Iil
-
-
ENV Pin Drive Current
Ienv
-
500µA
Output Current (OP1)
Iol
-
200µA
Output Current (OP2)
Ioh
-
200µA
Max.
5V
12µA
Vdd
Vss+0.3V
6µA
0.1µA
-
1200µA
1200µA
Conditions
No load
Vih=Vdd
Vil =Vss
Venv=0.8V
Vol=0.8V
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 )
BOWIN ELECTRONIC COMPANY
1
www.bowin-ic.com.hk
BOWIN [ BOWIN ELECTRONIC CO. ]
