Datasheet
Multi-function LCD Segment Drivers
BU97981xxx Series MAX 196 Segments (SEG49xCOM4)
Features
Integrated RAM for Display Data (DDRAM):
49 x4 Bit (Max 196 Segment)
LCD Drive Output:
4 Common Output, Max 49 Segment Output
Integrated 3ch LED Driver Circuit
Segment/ LED (Max 3port) Output Mode Selectable
Segment/ GPO (Max 31port) Output Mode
Selectable
Support PWM Generation from Ext. or Internal
Clock
(Resolution: 8bit Mode/12bit Mode Selectable)
Support Standby Mode
Integrated Power-on-Reset Circuit (POR)
Integrated Oscillator Circuit
No External Component
Low Power Consumption Design
Independent Power Supply for LCD Driving
Support Blink Function
(Blink Frequency 1.6, 2.0, 2.6, 4.0Hz selectable)
Applications
Telephone
FAX
Portable Equipment (POS, ECR, PDA etc.)
DSC
DVC
Car audio
Home Electrical Appliance
Meter Equipment
etc.
Typical Application Circuit
BU97981KV
LED/GPO using case
LED : 3port
GPO : 5port
LCD :164seg
VLED
*Reading resistor value
Please detect the value according to
inpu curremt value.
(cuurent MAX = 20mA)
Key Specifications
■
Supply Voltage Range:
+1.8V to +3.6V
■
LCD Drive Power Supply Range:
+3.3V to +5.5V
■
Operating Temperature Range:
-30°C to +75°C
■
Max Segments:
BU97981KV
196 Segments
BU97981MUV
168 Segments
BU97981GU
196 Segments
■
Max GPO Outputs:
BU97981KV
31port
BU97981MUV
27port
BU97981GU
31port
■
Max LED Drive Outputs:
BU97981KV
3port
BU97981MUV
3port
BU97981GU
3port
■
Display Duty:
Static. 1/3, 1/4 Selectable
■
Bias:
Static, 1/3
■
Integrated Regulator for LCD Drive:
3.2, 3.3, 3.4, 4.4, 4.5, 4.6, 5.0V Selectable
■
Interface:
3wire Serial Interface
VLCD
VDD
SEG48 (LED1)
SEG47 (LED2)
SEG46 (LED3)
BU97981KV
5.0V
3.3V
SEG45(GPO1) to
SEG41(GPO5)
Other
device
VSS1
VSS2
TEST1 CSB SCL SD
SEG0 to SEG40
INHb CLKIN
COM0 to COM3
LCD
Input signal from cintroller
＊CLKIN
Extenal CLK input terminal
In case being unused, connect to
VSS or be opened.
Figure 1. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
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© 2012 ROHM Co., Ltd. All rights reserved.
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○This
product has no designed protection against radioactive rays.
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BU97981xxx Series
MAX 196 segments (SEG49xCOM4)
Datasheet
Block Diagram / Pin Arrangement / Pin Description
BU97981KV
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
33
VSS2
VLCD
LCD voltage
Generator
Ref Voltage
Circuit
Vreg
LCD
BIAS
SELECTOR
COM0……COM3 SEG0 ……………………………… SEG48
common
driver
Segment
driver
Segment
Segment
driver/GPO driver/LED
49
SEG36
SEG37
SEG38
SEG39
SEG40
48
32
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
GPO/LED
Controller
common
counter
blink timing
generator
DDRAM
GPO data latch
SEG41
PWM
Generator
SEG42
SEG43
SEG44
VSS
SEG45
SEG46
INHb
CLKIN
OSCILLATOR
Command register
Data Decoder
Power On Reset
SEG47
SEG48
VSS2
serial inter face
Output
Controller
IF FILTER
PWMOUT
CLKIN
64
17
VDD
VSS
TEST1
COM0
COM1
COM2
COM3
SEG0
SEG1
SEG2
TEST1
CSB
SD
SCL
PWMOUT
Figure 2. Block Diagram
Figure 3. Pin Configuration (TOP VIEW)
Table 1. Pin Description
Terminal
CSB
SCL
SD
VDD
CLKIN
TEST1
VSS1
VLCD
Terminal
number
1
2
3
4
64
5
6
8
I/O
I
I
I
-
I
I
-
-
Unused case
-
-
-
-
OPEN / VSS
-
-
-
Chip select: "L" active
Serial data transfer clock
Input serial data
Power supply for LOGIC
External clock input terminal (for display/PWM using selectable)
Support Hi-Z input mode at internal clock mode
TEST terminal (Please connect VSS terminal)
GND
Power supply for LCD
Display turning on/off select terminal
H: turning on display, L: turning off display
INHb
7
I
VDD
INHb = “L”: All SEG/COM terminal : output VSS level
GPO terminal : output VSS level
LED drive terminal : output Hi-Z
PWM output for LED2 group
COMMON output for LCD
SEGMENT output for LCD
SEGMENT output for LCD/GPO
SEGMENT output for LCD/LED driver
GND (for SEG46-48 / LED driver)
Function
PWMOUT
COM0 to 3
SEG0 to 14
SEG15 to 45
SEG46 to 48
VSS2
63
9 to 12
13 to 27
28 to 58
59 to 61
62
O
O
O
O
O
-
OPEN
OPEN
OPEN
OPEN
OPEN
GND
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SEG3
VLCD
VSS1
INHb
VDD
CSB
SCL
SD
16
1
BU97981xxx Series
MAX 196 segments (SEG49xCOM4)
Datasheet
Block Diagram / Pin Arrangement / Pin Description
BU97981MUV
VDD
TEST1
COM0
COM1
COM2
COM3
10
11 12
VSS1
INHb
VLCD
SEG0
VLCD
LCD voltage
Generator
Ref Voltage
Circuit
Common
Driver
Segment
Driver
Segment
Driver/ GPO
Segment
Driver/ LED
1
2
3
4
5
6
7
8
9
13
14
15
CLKIN
Vreg
LCD
BIAS
SELECTOR
Common
counter
Blink timing
generator
DDRAM
GPO data latch
GPO / LED
Controller
SEG1
VSS2
CSB
SCL
SD
COM0 ….COM3
COM0……COM SEG0 …………………………….SEG48
3
56
55
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
VSS2
SEG41
SEG40
SEG39
SEG38
SEG37
SEG36
SEG35
16
17
18
54
53
PWM
Generator
52
51
50
19
20
EXT-PAD
21
VSS
49
48
47
22
23
INHb
CR oscillator
(typ:40.96KHz)
Clock
Divider
(div.2)
Power On
Reset
Command register
Data Decode
Serial inter face
Output
Controller
SEG34
SEG33
SEG32
24
25
26
27
46
45
44
43
CLKIN
VDD
VSS
OSC block
IF FILTER
SEG31
SEG30
SEG14
SEG15
28
42
41
40
39
38
37
36 35
34
33 32
31 30
29
SEG26
SEG23
SEG22
SEG25
SEG24
SCL
Figure 4. Block Diagram
Figure 5. Pin Configuration (BOTTOM VIEW)
Table 2. Pin Description
Terminal
CSB
SCL
SD
VDD
CLKIN
TEST1
VSS1
VLCD
Terminal
number
1
2
3
4
56
5
6
8
I/O
I
I
I
-
I
I
-
-
Unused case
-
-
-
-
OPEN / VSS
-
-
-
Chip select: "L" active
Serial data transfer clock
Input serial data
Power supply for LOGIC
External clock input terminal (for display/PWM using selectable)
Support Hi-Z input mode at internal clock mode
TEST terminal (Please connect VSS terminal)
GND
Power supply for LCD
Display turning on/off select terminal
H: turning on display, L: turning off display
INHb
7
I
VDD
INHb = “L”: All SEG/COM terminal : output VSS level
GPO terminal : output VSS level
LED drive terminal : output Hi-Z
COMMON output for LCD
SEGMENT output for LCD
SEGMENT output for LCD/GPO
SEGMENT output for LCD/LED driver
GND (for SEG39-41 / LED driver)
Function
COM0~3
SEG0~11
SEG12~38
SEG39~41
VSS2
9-12
13-24
25-51
52-54
55
(Note1)
O
O
O
O
-
OPEN
OPEN
OPEN
OPEN
GND
EXT-PAD
-
-
VSS
substrate
(Note1) To radiate heat, please contact a board with the EXT-PAD which is located at the bottom side of
VQFN56AV8080 package.
Please supply VSS level or Open state as the input condition for this PAD.
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SEG16
CSB
SD
SEG21
SEG20
SEG19
SEG18
SEG17
PWMOUT
SEG29
SEG28
SEG27
TEST1
BU97981xxx Series
MAX 196 segments (SEG49xCOM4)
Datasheet
Block Diagram / Pin Arrangement / Pin Description
BU97981GU
VSS2
VLCD
LCD voltage
Generator
Ref Voltage
Circuit
Vreg
LCD
BIAS
SELECTOR
common
counter
blink timing
generator
DDRAM
GPO data latch
GPO/LED
Controller
common
driver
Segment
driver
Segment
Segment
driver/GPO driver/LED
COM0……COM3 SEG0 ……………………………… SEG48
1
H
G
F
PWM
Generator
2
SEG5
3
4
5
6
7
8
SEG4
SEG9 SEG11 SEG14 SEG16 SEG18 SEG20
SEG2
SEG3
SEG7
SEG8 SEG12 SEG17 SEG19 SEG21
SEG0
SEG1
SEG6 SEG10 SEG13 SEG22 SEG23 SEG25
E
VSS
COM2 COM0 COM1 COM3 SEG15 SEG26 SEG24 SEG27
D
INHb
CLKIN
OSCILLATOR
Command register
Data Decoder
Power On Reset
VLCD
VDD
INHB SEG47 SEG31 SEG29 SEG28 SEG30
C
serial inter face
Output
Controller
IF FILTER
VSS1
SDA
SCL
SEG45 SEG42 SEG38 SEG33 SEG32
VDD
VSS
B
A
(NC)
CLKIN
PWM
OUT
VSS2 SEG44 SEG40 SEG39 SEG35 SEG34
CSB
SEG48 SEG46 SEG43 SEG41 SEG37 SEG36
CSB
SD
SCL
PWMOUT
Figure 6. Block Diagram
Figure 7. Pin Configuration (TOP VIEW)
Table 3. Pin Description
Terminal
CSB
SCL
SD
VDD
CLKIN
VSS1
VLCD
I/O
I
I
I
-
I
-
-
Unused case
-
-
-
-
OPEN / VSS
-
-
Chip select: "L" active
Serial data transfer clock
Input serial data
Power supply for LOGIC
External clock input terminal (for display/PWM using selectable)
Support Hi-Z input mode at internal clock mode
GND
Power supply for LCD
Display turning on/off select terminal
H: turning on display, L: turning off display
INHb
I
VDD
INHb = “L”: All SEG/COM terminal : output VSS level
GPO terminal : output VSS level
LED drive terminal : output Hi-Z
PWM output for LED2 group
COMMON output for LCD
SEGMENT output for LCD
SEGMENT output for LCD/GPO
SEGMENT output for LCD/LED driver
GND (for SEG46-48 / LED driver)
Function
PWMOUT
COM0 to 3
SEG0 to 14
SEG15 to 45
SEG46 to 48
VSS2
O
O
O
O
O
-
OPEN
OPEN
OPEN
OPEN
OPEN
GND
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TSZ02201-0A2A0D300110-1-2
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BU97981xxx Series
MAX 196 segments (SEG49xCOM4)
Datasheet
Absolute Maximum Ratings
(VSS=0V)
Parameter
Power Supply Voltage 1
Power Supply Voltage 2
Power Dissipation
Input Voltage Range
Operational Temperature Range
Storage Temperature Range
Symbol
VDD
VLCD
Pd
VIN
Topr
Tstg
Iout1
Output Current
Iout2
Iout3
Iout4
°
Ratings
-0.3 to +4.5
-0.5 to +7.0
1.0
3.6
0.8
(Note1)
(Note2)
(Note3)
Unit
V
V
W
V
°C
°C
mA
mA
mA
mA
SEG output
COM output
GPO output
LED output
Power supply
Remarks
Power supply for LCD
BU97981KV
BU97981MUV
BU97981GU
-0.5 to VDD+0.5
-30 to +75
-55 to +125
5
5
10
50
(Note1) When use more than Ta=25 C, subtract 10mW per degree. (using ROHM standard board)
(board size：70mm×70mm×1.6mm material: FR4 board copper foil: land pattern only).
°
(Note2) When use more than Ta=25 C, subtract 36mW per degree. (using ROHM standard board)
(board size：74.2mm×74.2mm×1.6mm SEMI standard 4 layer board)
°
(Note3) When operated higher than Ta=25 C, subtract 8.0mW per degree. (using ROHM standard board)
(board size：114.3mm×76.2mm×1.6mm)
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=-30°C to +75°C,VSS=0V)
Parameter
Power Supply Voltage 1
Power Supply Voltage 2
LED Supply Voltage
Output Current
Symbol
VDD
VLCD
VLED
Iout4
Iout4
Ratings
Min
1.8
3.3
1.0
-
-
Typ
-
-
-
-
-
Max
3.6
5.5
VLCD
20
60
Unit
V
V
V
Power supply
Power supply for LCD
Power supply for LED
Remarks
mA Per LED port 1ch
mA Total LED port current
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© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0A2A0D300110-1-2
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