Datasheet
Standard LCD Segment Drivers
BU9795Axxx Series
MAX 140 segments (SEG35×COM4)
●Key
Specifications
■
Supply Voltage Range:
+2.5V to +5.5V
■
Operating Temperature Range:
-40°C to +85°C
■
Max Segments:
BU9795AKV
140 Segments
BU9795AFV
108 Segments
BU9795AGUW
124 Segments
BU9795AKS2
140 Segments
■
Display Duty:
1/4
■
Bias:
1/2, 1/3 selectable
■
Interface:
3wire serial interface
●Packages
●Features
Integrated RAM for display data (DDRAM) :
35 × 4bit (Max 140 Segment)
LCD drive output :
4 Common output, Max 35Segment output
Integrated Buffer AMP for LCD driving
Integrated Oscillator circuit
No external components
Low power consumption design
●Applications
Telephone
FAX
Portable equipment (POS, ECR, PDA etc.)
DSC
DVC
Car audio
Home electrical appliance
Meter equipment
etc.
W (Typ.) x D (Typ.) x H (Max.)
VQFP48C
9.00mm x 9.00mm x 1.60mm
VBGA048W040
4.00mm x 4.00mm x 0.90mm
SSOP-B40
SQFP-T52M
13.60mm x 7.80mm x 2.00mm 12.00mm x 12.00mm x 1.40mm
●Typical
Application Circuit
VDD
VDD
VLCD
COM0
COM1
COM2
COM3
Controller
INHb
CSB
SD
SCL
Segment
SEG0
SEG1
・
・
・
・
・
・
・
SEG34
LCD
OSCIN
TEST
VSS
Internal oscillator circuit mode
Figure 1.
○Product
structure：Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½14½001
Typical application circuit
○This
product is not designed for protection against radioactive rays.
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TSZ02201-0A0A2D300020-1-2
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BU9795Axxx Series
MAX 140 segments (SEG35×COM4)
Datasheet
●Block
Diagrams / Pin Configurations / Pin Descriptions
BU9795AKV
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
25
COM0
37
COM1
＋
－
LCD BIAS
SELECTOR
＋
－
Common
counter
Blink timing
generator
DDRAM
COM0…… COM3
VDD
LCD voltage generator
Common
driver
Segment
driver
SEG0
…
SEG34
36
24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
COM2
COM3
VLCD
VDD
VSS
OSCIN
VLCD
CSB
INHb
OSCIN
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
SCL
SD
TEST
INHb
48
Serial inter face
SEG12
13
1
IF FILTER
VSS
SEG10
TEST
CSB
SD
SCL
Figure 2. Block Diagram
Figure 3.
Pin Configuration (TOP VIEW)
Table 1 Pin Description
Pin name
INHb
TEST
OSCIN
SD
SCL
CSB
VSS
VDD
VLCD
SEG0 to 34
COM0 to 3
Pin No.
48
47
43
46
45
44
42
41
40
1 to 35
36 to 39
O
O
I/O
I
I
I
I
I
I
Function
Input terminal for turn off display
H : turn on display
L : turn off display
Test input (ROHM use only)
Must be connected to VSS
External clock input
External clock and Internal clock can be selected by command.
Must be connected to VSS when using internal oscillation circuit.
Serial data input
Serial data transfer clock
Chip select : ”L” active
GND
Power supply
Power supply for LCD driving
SEGMENT output for LCD driving
COMMON output for LCD driving
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
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SEG11
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
12
BU9795Axxx Series
MAX 140 segments (SEG35×COM4)
Datasheet
●Block
Diagrams / Pin Configurations / Pin Descriptions - continued
BU9795AFV
COM0…… COM3
VDD
LCD voltage generator
Common
driver
Segment
driver
SEG0
…
SEG30
＋
SEG30
SEG29
SEG26
COM3
COM2
COM1
SEG7
SEG6
SEG5
SEG4
SDA
CSB
SCL
VSS
VDD
LCD BIAS
SELECTOR
＋
－
Common
counter
Blink timing
generator
DDRAM
VLCD
INHb
OSCIN
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
COM0
TEST
VLCD
INHb
－
SEG25
Serial inter face
IF FILTER
VSS
TEST
CSB
SD
SCL
Figure 4. Block Diagram
Figure 5.
Pin Configuration (TOP VIEW)
Table 2 Pin Description
Pin name
INHb
TEST
OSCIN
SD
SCL
CSB
VSS
VDD
VLCD
SEG4 to 30
COM0 to 3
Pin No.
36
35
31
34
33
32
30
29
28
1 to 23,
37 to 40
24 to 27
I
O
O
I/O
I
I
I
I
I
I
Function
Input terminal for turn off display
H : turn on display
L : turn off display
Test input (ROHM use only)
Must be connected to VSS
External clock input
Ex clock and Int clock can be changed by command.
Must be connected to VSS when using internal oscillation circuit.
Serial data input
Serial data transfer clock
Chip select : ”L” active
GND
Power supply
Power supply for LCD driving
SEGMENT output for LCD driving
COMMON output for LCD driving
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
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SEG27
SEG8
SEG9
SEG28
OSCIN
BU9795Axxx Series
MAX 140 segments (SEG35×COM4)
Datasheet
●Block
Diagrams / Pin Configurations / Pin Descriptions - continued
BU9795AGUW
COM0…… COM3
VDD
LCD voltage generator
Common
driver
SEG0
…
SEG32
1
G
(NC)
2
SEG13
3
SEG15
4
SEG18
5
SEG20
6
SEG22
7
(NC)
Segment
driver
F
＋
－
LCD BIAS
SELECTOR
＋
－
Common
counter
Blink timing
generator
DDRAM
SEG11
SEG12
SEG16
SEG17
SEG21
SEG23
SEG24
E
SEG9
SEG10
SEG14
SEG19
SEG25
SEG27
SEG26
D
VLCD
SEG7
SEG6
SEG8
SEG5
SEG30
SEG28
SEG29
INHb
OSCIN
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
C
SEG4
SEG3
SEG2
CSB
COM3
SEG32
SEG31
B
Serial inter face
INHb
SD
VSS
VDD
COM1
COM0
IF FILTER
VSS
A
(NC)
TEST2
SCL
OSCIN
VLCD
COM2
(NC)
TEST
CSB
SD
SCL
Figure 6. Block Diagram
Figure 7.
Pin Configuration (BOTTOM VIEW)
Table 3 Pin Description
Pin name
INHb
TEST
OSCIN
SD
SCL
CSB
VSS
VDD
VLCD
SEG2 to 32
COM0 to 3
I
O
O
I/O
I
I
I
I
I
I
Function
Input terminal for turn off display
H : turn on display
L : turn off display
Test input (ROHM use only)
Must be connected to VSS
External clock input
Ex clock and Int clock can be changed by command.
Must be connected to VSS when using internal oscillation circuit.
Serial data input
Serial data transfer clock
Chip select : ”L” active
GND
Power supply
Power supply for LCD driving
SEGMENT output for LCD driving
COMMON output for LCD driving
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
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TSZ02201-0A0A2D300020-1-2
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BU9795Axxx Series
MAX 140 segments (SEG35×COM4)
Datasheet
●Block
Diagrams / Pin Configurations / Pin Descriptions – continued
BU9795AKS2
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG13
SEG14
COM0…… COM3
VDD
LCD voltage generator
Common
driver
SEG0
…
SEG34
39
40
NC
NC
27
26
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
Segment
driver
SEG24
SEG25
SEG26
＋
－
LCD BIAS
SELECTOR
＋
－
Common
counter
Blink timing
generator
DDRAM
SEG27
SEG28
SEG29
SEG30
SEG31
VLCD
SEG32
SEG33
INHb
OSCIN
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
SEG34
COM0
COM1
Serial inter face
52
1
COM2
COM3
VDD
TEST
NC
VLCD
NC
INHB
SCL
SDA
VSS
CSB
OSCIN
13
14
IF FILTER
VSS
TEST
CSB
SD
SCL
Figure 8.
Block Diagram
Figure 9.
Pin Configuration
(TOP VIEW)
Table 4 Pin Description
Pin name
INHb
TEST
OSCIN
SD
SCL
CSB
VSS
VDD
VLCD
SEG0-34
COM0-3
Pin No.
13
12
7
10
9
8
6
5
4
14-28,
30-36
38-50
51-52,
1-2
O
O
I/O
I
I
I
I
I
I
Function
Input terminal for turn off display
H : turn on display
L : turn off display
Test input (ROHM use only)
Must be connect to VSS
External clock input
Ex clock and Int clock can be changed by command.
Must be connect to VSS when use internal oscillation circuit.
serial data input
serial data transfer clock
Chip select
GND
Power supply
Power supply for LCD driving
SEGMENT output for LCD driving
COMMON output for LCD driving
:
”L” active
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
5/36
TSZ02201-0A0A2D300020-1-2
8.Jan.2013 Rev.003
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