bu9768ak ROHM Co. Ltd., bu9768ak Datasheet - Page 3

• Manufacturer Part Number: bu9768ak
• Description: Driver Segmented Module With Input Function
• Manufacturer: ROHM Co. Ltd.

•
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Power
dissipation
Standard ICs
Power supply voltage
Input voltage
Output voltage
Output current
Storage temperature
Pin descriptions
Absolute maximum ratings (Ta = 25°C)
This is the maximum voltage which may be applied to the V
Reduced by 8.0mW (AK) or 7.5mW (AKV) for each increase in Ta of 1 C over 25 C.
41 ~ 43
46 ~ 49
50 ~ 54
Pin No.
5 ~ 40
44, 45
1 ~ 4
Parameter
55
57
58
60
61
62
63
64
BU9768AK
BU9768AKV
KO
S
1
COM
(EP
1
(S
KO
Pin name
KI
S
1
41
5
V
V
) ~ S
OSC
1
3
1
RST
Symbol
DO
I
I
I
I
CS
CK
), KO
~ S
DD
DD
DI
OUT
OUT
OUT
OUT
~ COM
~ KO
~ KI
V
V
T
V
P
OUT
1
2
DD
stg
IN
d
40
4
(1)
(2)
(3)
(4)
5
2
(EP
6
(S
3
42
4
)
V
RST, OSC, CS, CK, DI, KI
OSC, DO, KO
COM
EP
S
KO
)
DD
1
1
~ S
1
I / O
~ EP
~ KO
—
—
—
O
O
O
O
O
O
1
I
I
I
I
I
40
~ COM
4
6
Output pins for switching between segment output
and expansion pin output. Switched using control
codes P
these output set data (1 or 0).
Segment output pins. These output waveforms
correspond to serial data input from DI.
Output pins for switching between key scan output
and segment output. Switching is enabled using
control codes K
Internal reference voltage for LCD. When using in the
1 / 2 bias mode, this should be connected to V
Internal reference voltage for LCD. When using in the
1 / 2 bias mode, this should be connected to V
Reset input pin for Low Active state. Segment and
common outputs are fixed at LOW level while RST is
LOW, and all displays disappear. Data for LCD
displays is not reset. All data in the key scan buffer is
cleared.
Common output pins
Key scan output pins
Key scan input pins
Oscillator pin for segment / common alternating waveforms
Key buffer data output pin. After a key scan has been
completed, if key input existed, this changes to LOW.
Also, if the key data communications command is
input, the contents of the key buffer are output as
serial data. Since this is open drain output, it should
be used with a pull-up resistor.
Chip select input pin
Synchronous clock input pin for data transmission
Data input pin for LCD display
SS
1
Pin
—
—
3
pin.
~ KO
0
6
, EP
and P
1
1
~ EP
0
~ KI
and K
1
. When expansion pins are used,
5
4
– 0.3 ~ V
– 0.3 ~ V
Function
1
– 0.3 ~ + 7.0
.
– 55 ~ + 125
Limits
300
800
750
3
5
1
DD
DD
+ 0.3
+ 0.3
BU9768AK / BU9768AKV
mW
Unit
mA
mA
mA
V
V
V
C
A
DD2
DD1
.
.
Processing if not used
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
V
V
V
V
—
—
—
DD
SS
SS
SS
3