Datasheet
Standard LCD Segment Driver
BU9799KV
MAX 200 segments (SEG50×COM4)
●Key
Specifications
■
Supply Voltage Range:
+2.5V to +5.5V
■
LCD drive power supply Range:
+2.5V to +5.5V
■
Operating Temperature Range:
-40°C to +85°C
■
Max Segments:
200 Segments
■
Display Duty:
1/4
■
Bias:
1/2, 1/3 selectable
■
Interface:
2wire serial interface
●Package
W (Typ.) x D (Typ.) x H (Max.)
●Features
Integrated RAM for display data (DDRAM):
50 x 4 bit (Max 200 Segment)
LCD drive output :
4 Common output, 50 Segment output
Integrated Buffer AMP for LCD driving
Integrated Oscillator circuit
No external components
Low power consumption design
Independent power supply for LCD driving
Integrated Electrical volume register (EVR) function
●Applications
Telephone
FAX
Portable equipment (POS, ECR, PDA etc.)
DSC
DVC
Car audio
Home electrical appliances
Meter equipment, etc.
VQFP64
12.00mm x 12.00mm x 1.60mm
●Typical
Application Circuit
VLCD
VDD
VDD
VLCD
SD
SCL
COM0
COM1
COM2
COM3
Segment
LCD
½ ½ ½ ½ ½ ½ ½
Controller
VDD
INHb
OSCIN
TEST1
TEST2
TEST3
VSS
SEG0
SEG1
½ ½ ½ ½ ½
SEG49
Internal oscillator circuit mode
Figure 1. Typical application circuit
○Product
structure：Silicon monolithic integrated circuit
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½14½001
○This
product is not designed for protection against radioactive rays.
1/24
TSZ02201-0A0A2D300040-1-2
23.Jan.2015 Rev.003
BU9799KV
MAX 200 segments (SEG50×COM4)
Datasheet
●Block
Diagram / Pin Configuration / Pin Description
COM0
……
COM3
VLCD
SEG0
…
SEG49
LCD voltage generator
Common
driver
＋
－
Segment
driver
48
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
33
＋
－
LCD
BIAS
SELECTOR
Common
counter
Blink timing
generator
DDRAM
49
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
32
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
17
16
1
＋
－
VSS
INHb
OSCIN
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
SEG45
SEG46
SEG47
SEG48
SEG49
COM0
COM1
COM2
COM3
64
Serial interface
VDD
VSS
IF FILTER
OSCIN
TEST3
TEST1
TEST2
VLCD
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SDA
INHb
VDD
VSS
SCL
TEST3
TEST2
TEST1
SDA
SCL
Figure 2. Block Diagram
Figure 3.
Pin Configuration (TOP VIEW)
Table 1 Pin Description
Terminal
INHb
Terminal No.
8
I/O
I
Function
Input terminal for turning off display
H: turn on display
L: turn off display
Test input (ROHM use only)
TEST1=”L”: POR circuit enable
TEST1=”H”: POR circuit disable,
refer to “Cautions in Power ON/OFF”
Test input (ROHM use only)
Must be connected to VSS
Test input (ROHM use only)
Must be connected to VSS
External clock input
External clock and Internal clock modes can be selected by command.
Must be connected to VSS when use internal oscillation circuit.
Serial data input
Serial data transfer clock
GND
Power supply
Power supply for LCD driving
O
O
SEGMENT output for LCD driving
COMMON output for LCD driving
TEST1
9
I
TEST2
TEST3
OSCIN
SDA
SCL
VSS
VDD
VLCD
SEG0-49
COM0-3
10
5
4
7
6
3
2
1
11-60
61-64
I
I
I
I
I
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
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TSZ02201-0A0A2D300040-1-2
23.Jan.2015 Rev.003
BU9799KV
MAX 200 segments (SEG50×COM4)
Datasheet
●Absolute
Maximum Ratings
(VSS=0V)
Parameter
Symbol
Power Supply Voltage1
Power Supply Voltage2
Power dissipation
Input voltage range
Operational temperature
range
Storage temperature range
VDD
VLCD
Pd
VIN
Topr
Tstg
Ratings
-0.5 to +7.0
-0.5 to +7.0
0.75
-0.5 to VDD+0.5
-40 to +85
-55 to +125
Unit
V
V
W
V
℃
℃
Power supply
Remarks
LCD drive voltage
When operated at more than 25℃,
subtract 7.5mW/°C (Package only)
●Recommended
Operating Ratings(Ta=-40°C to +85°C,VSS=0V)
Ratings
Parameter
Symbol
MIN
TYP
MAX
Power Supply Voltage1
Power Supply Voltage2
VDD
VLCD
2.5
2.5
-
-
5.5
5.5
Unit
V
V
Power supply
Remarks
LCD drive voltage
●Electrical
Characteristics
DC Characteristics (VDD=2.5V to 5.5V, VLCD=2.5V to 5.5V, VSS=0V, Ta=-40℃ to 85℃, unless otherwise specified)
Limits
Parameter
Symbol
Unit
Conditions
MIN
TYP
MAX
“H” level input voltage
“L” level input voltage
“H” level input current
“L” level input current
LCD Driver on
resistance
Standby current
Power consumption 1
Power consumption 2
SEG
COM
VIH
VIL
IIH
IIL
RON
RON
Ist
IDD
ILCD
0.8VDD
VSS
-
-1
-
-
-
-
-
-
-
-
-
3.5
3.5
-
2.5
10
VDD
0.2VDD
1
-
-
-
5
15
20
V
V
µA
µA
kΩ
kΩ
µA
µA
µA
SDA,SCL
SDA,SCL
SDA,SCL
SDA,SCL
Iload=±10µA
Display off, Oscillation off
VDD=3.3V, VLCD=5V, Ta=25℃
Power save mode1, FR=70Hz
1/3 bias, Frame inverse
VDD=3.3V, VLCD=5V, Ta=25℃
Power save mode1, FR=70Hz
1/3 bias, Frame inverse
Oscillation Characteristics (VDD=2.5V to 5.5V, VLCD=2.5V to 5.5V, VSS=0V, Ta=-40℃ to 85℃, unless otherwise specified)
Limits
Parameter
Symbol
Unit
Conditions
MIN
TYP
MAX
Frame frequency
fCLK
56
80
104
Hz
FR = 80Hz setting, VDD=3.3V
MPU interface Characteristics
(VDD=2.5V to 5.5V, VLCD=2.5V to 5.5V, VSS=0V, Ta=-40℃ to 85℃, unless otherwise specified)
Limits
Parameter
Symbol
Unit
Conditions
MIN
TYP
MAX
Input rise time
Input fall time
SCL cycle time
“H” SCL pulse width
“L” SCL pulse width
SDA setup time
SDA hold time
Buss free time
START condition hold time
START condition setup time
STOP condition setup time
tr
tf
tSCYC
tSHW
tSLW
tSDS
tSDH
tBUF
tHD;STA
tSU;STA
tSU;STO
-
-
2.5
0.6
1.3
100
100
1.3
0.6
0.6
0.6
-
-
-
-
-
-
-
-
-
-
-
0.3
0.3
-
-
-
-
-
-
-
-
-
µs
µs
µs
µs
µs
µs
us
µs
µs
µs
µs
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
3/24
TSZ02201-0A0A2D300040-1-2
23.Jan.2015 Rev.003
BU9799KV
MAX 200 segments (SEG50×COM4)
Datasheet
SDA
tBUF
tS LW
tf
tSCYC
SCL
tHD; STA
tr
tSDH
tS HW
tSDS
SDA
tSU; STA
tSU; STO
Figure 4. Interface Timing
●I/O
equivalent circuit
VDD
SDA
VSS
VSS
VLCD
SCL
VSS
VSS
VDD
OSCIN
VSS
VDD
TEST3
VSS
VLCD
SEG/COM
VSS
Figure 5. I/O equivalent circuit
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
4/24
TSZ02201-0A0A2D300040-1-2
23.Jan.2015 Rev.003
BU9799KV
MAX 200 segments (SEG50×COM4)
Datasheet
●Example
of recommended circuit
VLCD
VDD
VDD
VLCD
SD
SCL
COM0
COM1
COM2
COM3
Segment
LCD
½ ½ ½ ½ ½ ½ ½
Controller
VDD
INHb
OSCIN
TEST1
TEST2
TEST3
VSS
SEG0
SEG1
½ ½ ½ ½ ½
SEG49
Internal oscillator circuit mode
VLCD
VDD
COM0
COM1
COM2
COM3
Segment
LCD
½ ½ ½ ½ ½ ½ ½
VDD
VLCD
SD
SCL
VDD
INHb
OSCIN
TEST1
TEST3
TEST2
VSS
Controller
SEG0
SEG1
½ ½ ½ ½ ½
SEG49
External clock input mode
Figure 6. Example of recommended circuit
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
5/24
TSZ02201-0A0A2D300040-1-2
23.Jan.2015 Rev.003
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