Datasheet
Low Duty LCD Segment Driver
for Automotive Application
BU91799KV-M
General Description
BU91799KV-M is a 1/4 duty general-purpose LCD driver
that can be used for automotive applications and can
drive up to 200 LCD Segments.
It can support operating temperature of up to +105°C and
qualified for AEC-Q100 Grade2, as required for
automotive applications.
It has integrated display RAM for reducing CPU load. Also,
it is designed with low power consumption and no
external component needed.
MAX 200 segments (SEG50×COM4)
Key Specifications
■
■
■
■
■
■
■
Supply Voltage Range:
+2.5V to +6.0V
LCD Drive Power Supply Range:
+2.5V to +6.0V
Operating Temperature Range:
-40°C to +105°C
Max Segments:
200 Segments
Display Duty:
1/4
Bias:
1/3
Interface:
2wire Serial Interface
Special Characteristics
■
■
ESD(HBM):
Latch-up Current:
±2000V
±100mA
W (Typ) x D (Typ) x H (Max)
Features
AEC-Q100 Qualified
(Note)
Integrated RAM for Display Data (DDRAM):
50 x 4 bit (Max 200 Segment)
LCD Drive Output :
4 Common Output, Max 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
Package
(Note)
Grade 2
Applications
etc.
Instrument Clusters
Climate Controls
Car Audios / Radios
Metering
White Goods
Healthcare Products
Battery Operated Applications
VQFP64
12.00mm x 12.00mm x 1.60mm
Typical Application Circuit
VLCD
VDD
VDD
VLCD
SDA
SCL
VDD
INHb
OSCIN
TEST1
I
nsert Capacitors between
C > 0.1µF
COM0
COM1
COM2
COM3
Segment
LCD
Controller
SEG0
SEG1
VDD / VSS and VLCD / VSS
VSS
SEG49
Internal Clock Mode
Figure 1. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
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© 2015 ROHM Co., Ltd. All rights reserved.
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○This
product is not designed for protection against radioactive rays.
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BU91799KV-M
MAX 200 segments (SEG50×COM4)
Block Diagram / Pin Configuration / Pin Description
COM0
……
COM 3
VLCD
SEG0
…
SEG 49
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
33
LCD voltage generator
Common
Driver
Segment
Driver
49
SEG38
SEG39
SEG40
＋
－
48
＋
－
32
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
LCD
BIAS
SELECTOR
Common
Counter
Blink Timing
Generator
DDRAM
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
＋
－
VSS
INHb
OSCIN
OSCILLATOR
Power On Reset
Serial Interface
Command
Register
Command
Data Decoder
SEG48
SEG49
COM0
COM1
COM2
COM3
64
SEG6
17
1
INHb
TEST1
OSCIN
NC
SCL
NC
SEG0
SEG1
SEG2
SEG3
SEG4
VSS
TEST 1
SDA
SCL
Figure 2. Block Diagram
Table 1 Pin Description
Pin Name
INHb
TEST1
NC
NC
OSCIN
SDA
SCL
VSS
VDD
VLCD
SEG0 to
SEG49
COM0 to
COM3
Pin No.
8
9
10
5
4
7
6
3
2
1
11 to 60
61 to 64
I/O
I
I
-
-
I
I/O
I
-
-
-
O
O
Function
Input terminal for display control
VDD: Display enable
VSS: Display disenable
POR enable setting
VDD: POR disenable
(Note)
VSS: POR enable
Non connection
Non connection
Figure 3. Pin Configuration (TOP VIEW)
VLCD
Handling
when unused
VDD
VSS
OPEN
OPEN
VSS
-
-
-
-
-
OPEN
OPEN
External clock input
External clock and Internal clock modes can be selected by command
Must be connected to VSS when using internal oscillator.
Serial data in-out terminal
Serial clock terminal
Ground
Power supply
Power supply for LCD driving
SEGMENT output for LCD driving
COMMON output for LCD driving
(Note)
This function is guaranteed by design, not tested in production process. Software Reset is necessary to initialize IC in case of TEST1=VDD.
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SEG5
VSS
VDD
SDA
IF FILTER
16
VDD
BU91799KV-M
MAX 200 segments (SEG50×COM4)
Absolute Maximum Ratings (VSS=0V)
Parameter
Maximum Voltage1
Maximum Voltage2
Power Dissipation
Input Voltage Range
Operational Temperature
Range
Storage Temperature Range
Symbol
VDD
VLCD
Pd
V
IN
Topr
Tstg
Ratings
-0.5 to +7.0
-0.5 to +7.0
1.00
(Note 1)
-0.5 to VDD+0.5
-40 to +105
-55 to +125
Unit
V
V
W
V
°C
ºC
Power Supply
LCD Drive Voltage
Remarks
(Note 1)
Derate by 10mW/°C when operating above Ta=25°C (when mounted in ROHM’s standard board).
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the
absolute maximum ratings.
Recommended Operating Conditions (Ta=-40°C to +105°C, VSS=0V)
Parameter
Power Supply Voltage1
Power Supply Voltage2
Symbol
VDD
VLCD
Ratings
Min
2.5
2.5
Typ
-
-
Max
6.0
6.0
Unit
V
V
Power Supply
LCD Drive Voltage
Remarks
Electrical Characteristics
DC Characteristics (VDD=2.5V to 6.0V, VLCD=2.5V to 6.0V, VSS=0V, Ta=-40°C to +105°C, unless otherwise specified)
Limits
Parameter
Symbol
Unit
Conditions
Min
Typ
Max
“H” Level Input Voltage
“L” Level Input Voltage
“H” Level Input Current1
“L” Level Input Current1
“H” Level Input Current2
SDA “L” Level Output Voltage
LCD Driver on
Resistance
Standby Current
Power Consumption 1
Power Consumption 2
(Note 2)
For external clock mode only
V
IH
V
IL
I
IH1
I
IL1
I
IH2
V
OL_SDA
R
ON
R
ON
Ist
I
DD
I
LCD
0.7VDD
VSS
-
-1
-
0
-
-
-
-
-
-
-
-
-
-
-
3
3
-
2.5
10
VDD
0.3VDD
1
-
300
0.4
-
-
5
15
20
V
V
µA
µA
µA
V
kΩ
kΩ
µA
µA
µA
SDA, SCL, OSCIN, INHb
SDA, SCL, OSCIN, INHb
SDA, SCL, OSCIN
(Note
2)
, INHb
SDA, SCL, OSCIN, INHb, TEST1
TEST1
Iload = 3mA
Iload=±10µA
Display off, Oscillation off
VDD=3.3V, VLCD=5V, Ta=+25°C
Power save mode1, FR=71Hz
1/3 bias, Frame inverse
VDD=3.3V, VLCD=5V, Ta=+25°C
Power save mode1, FR=71Hz
1/3 bias, Frame inverse
SEG
COM
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BU91799KV-M
MAX 200 segments (SEG50×COM4)
Electrical Characteristics – continued
Oscillation Characteristics
(VDD=2.5V to 6.0V, VLCD=2.5V to 6.0V, VSS=0V, Ta=-40°C to +105°C, unless otherwise specified)
Limits
Parameter
Symbol
Unit
Conditions
Min
Typ
Max
FR = 80Hz setting,
Frame Frequency1
f
CLK1
56
80
112
Hz
VDD=2.5V to 6.0V, Ta=-40°C to +105°C
FR = 80Hz setting, VDD=3.3V,
Frame Frequency2
f
CLK2
70
80
90
Hz
Ta=+25°C
FR = 80Hz setting, VDD=5.0V,
Frame Frequency3
f
CLK3
77.5
87.5
97.5
Hz
Ta=+25°C
FR = 80Hz setting, VDD=5.0V,
Frame Frequency4
f
CLK4
67.5
87.5
108
Hz
Ta=-40°C to +105°C
External Clock Rise Time
tr
-
-
0.3
µs
External Clock Fall Time
External Frequency
External Clock Duty
tf
f
EXCLK
t
DTY
-
15
30
-
-
50
/ 512
/ 576
/ 648
/ 768
0.3
300
70
µs
kHz
%
External clock mode (OSCIN)
(Note)
(Note)
<Frame frequency calculation at external clock mode>
DISCTL 80HZ setting: Frame frequency [Hz] = external clock [Hz]
DISCTL 71HZ setting: Frame frequency [Hz] = external clock [Hz]
DISCTL 64HZ setting: Frame frequency [Hz] = external clock [Hz]
DISCTL 53HZ setting: Frame frequency [Hz] = external clock [Hz]
[Reference Data]
110
100
VDD = 6.0V
VDD = 5.0V
Frame Frequency [Hz]
90
VDD = 3.3V
80
70
60
50
-40 -20
0
20
VDD = 2.7V
40
60
80
100
Temperature [°C]
Figure 4. Frame Frequency Typical Temperature Characteristics
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BU91799KV-M
MAX 200 segments (SEG50×COM4)
Electrical Characteristics – continued
MPU interface Characteristics
(VDD=2.5V to 6.0V, VLCD=2.5V to 6.0V, VSS=0V, Ta=-40°C to +105°C, 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
t
SCYC
t
SHW
t
SLW
t
SDS
t
SDH
t
BUF
t
HD;STA
t
SU;STA
t
SU;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
ns
ns
µs
µs
µs
µs
SDA
t
BUF
t
SLW
SLW
tf
t
SCYC
SCL
t
HD;STA
tr
t
SDH
t
SHW
t
SDS
SDA
t
SU;STA
t
SU;STO
Figure 5. Interface Timing
I/O Equivalence Circuit
VDD
SDA
VSS
VLCD
VSS
SCL
VSS
VSS
VDD
TEST1
VSS
VDD
INHb
VSS
VDD
OSCIN
VSS
VLCD
SEG/COM
VSS
Figure 6. I/O Equivalence Circuit
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