TECHNICAL DATA
2011, February Ver. 01
SIMPLE MELODY GENERATOR
FEATURES
• 127-note ROM memory
• 1.3V to 3.3V power supply and
low power consumption
• RC oscillator on chip
• One shot or level hold mode
•
Sound range: 4 octaves, 2
series
• Tempo: 16 kinds (presto-
largo)
• Direct piez o drive
FUNCTIONS
• Solution of automatic stop or repeat of the
melody
• Dynamic s peaker can be dr iven with external
NPN transistor
•
Two or three times repeat of melody (mask
option)
• Each note can be individually programmed to
be staccato or legato (mask option)
•
Changing the contents of melody is possible
by reprogramming the maskable ROM
• Power on reset; melody begins from the first
note
• Start from the head of melody
• Bare chip or TO-92 are available
DESCRIPTION
The BT8028 is a CMOS LSI chip which electronically plays a prearranged melod y. Selection of melod y start signal is
possible by mask option: orders specification suffix "L" indicate Level Hold Mode, and suffix "S" indicate One Shot
Mode. The Universal version (as One Shot or Level Hold Mode) is possible also (suffix "U").
ABSOLUTE MAXIMUM RATINGS (Ta = 25
o
C)
Characteristic Symbol Value Unit
DC Supply Voltage V
CC
– V
SS
-0.3 ~ 3.5 V
Input Voltage V
IN
V
SS
– 0.3 ~ V
CC
– 0.3 V
Operating Temperature T
opr
-20 ~ +65
o
C
Stor age Tem pera ture T
stg
-55 ~ +125
o
C
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those
indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(T
a
= 25
o
C, V
CC
= 1.5V ; unless o ther wise specified)
Characteristic Symbol Test Condi tion Min Typ Max Unit
Operating Volta ge V
CC
1.3 1.5 3.3 V
Supply Current Stand-by I
S
0.1 1
µA
Operating I
CC
Output open 60
Output Drive Current I
OH
V
CC
=1.3V, V
O
=0.8V 0.6 1.5 mA
Out pu t S i n k Current I
OL
V
CC
=1.3V, V
O
=0.5V 0.6 1.5 mA
Frequency Stability
∆F/F
F
OSC
(1.6V) - F
OSC
(1.3V) 12 %
F
OSC
(1.3V)
BT8028C-xx
8028C
-xxL(S)
Out
Vcc
Vss
YWW
BT8028-xx
2011, February Ver. 01
APPLICATION CIRCUITS
LEVEL HOLD
1
2
3
4
5
6
7
MT
TEST
OSC
V
SS
V
CC
BD
BDN
1.5V
or 3. 0V
+
-
K1
1
2
3
4
5
6
7
MT
TEST
OSC
V
SS
V
CC
BD
BDN
1.5V
or 3.0V
+
-
K1
ONE SHOT
1
2
3
4
5
6
7
MT
TEST
OSC
V
SS
V
CC
BD
BDN
1.5V
or 3.0V
+
-
K1
1
2
3
4
5
6
7
MT
TEST
OSC
V
SS
V
CC
BD
BDN
1.5V
or 3.0V
+
-
K1
TO-92 ONE SHOT OR LEVEL HOLD MODE CHIP FORM