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PDF BU9794KV Data sheet ( Hoja de datos )
| Número de pieza | BU9794KV | |
| Descripción | Standard Segment Drivers | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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LCD Segment Drivers
Standard
Segment Drivers
BU9796FS,BU9795AKV,BU9795AFV,BU9795AGUW,BU9794KV,BU9799KV
No.10044EAT05
●Description
ROHM standard function segment driver series achieve “Ultra-Low power consumption”. Also these drivers need not
external components. And this driver series is very simple that only has segment driver function. So, this driver series are
very suitable to add in LCD display function for various applications.
●Features
1) 2wire serial interface (BU9796FS, BU9799KV)
2) 3wire serial interface (BU9794KV, BU9795AKV/FV/GUW)
3) Integrated RAM for display data (DDRAM)
4) Power supply circuit for LCD driving
1/2, 1/3Bias selectable
1/4Duty
Integrated Buffer AMP
5) Integrated Oscillation circuit
6) Integrated Power-on Reset circuit
7) No external components
8) Support blink function
9) Support standby mode
10) Low voltage / Ultra low power consumption design
11) Support EVR function (BU9799KV)
12) Support unity voltage supply (BU9795AKV/FV/GUW, BU9796FS)
13) Support Independent power supply circuit for LCD driving (BU9794KV, BU9799KV)
●Applications
Telephone, FAX, Portable equipment (POS, ECR, PDA etc.),
DSC, DVC, Car Audio, Home electrical appliance, Meter equipment, Healthcare equipment etc.
●Line up matrix
Parameter
BU9796FS
Segment output
Common output
Total display
dot number
Adjustable contrast function
Support split voltage supply
Interface
Package
20
4
80
-
-
2wire
SSOP-A32
KV
35
4
140
-
-
3wire
VQFP48C
BU9795A
FV
27
4
108
-
-
3wire
SSOP-B40
GUW
31
4
124
-
-
3wire
VBGA48W040
BU9794KV
50
4
200
-
Yes
3wire
VQFP64
BU9799KV
50
4
200
Yes
Yes
2wire
VQFP64
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.04 - Rev.A
1 page  
BU9796FS,BU9795AKV,BU9795AFV,BU9795AGUW,BU9794KV,BU9799KV Technical Note
<BU9794KV>
DC Characteristics (VDD=2.5~5.5V, VLCD=2.5~5.5V, VSS=0V, Ta=-40~85C, unless otherwise specified)
Parameter
Limits
Symbol
Unit
MIN TYP MAX
Condition
“H” level input voltage
VIH 0.8VDD -
VDD V SD,SCL,CSB
“L” level input voltage
VIL VSS
- 0.2VDD V SD,SCL,CSB
“H” level input current
IIH - - 1 µA SD,SCL,CSB
“L” level input current
IIL -1 -
- µA SD,SCL,CSB
LCD Driver
on resistance
SEG
COM
RON
RON
-
-
3.5
3.5
- kΩ
Iload=±10µA
- kΩ
Standby current
Ist - - 5 µA Display off, Oscillation off
Power consumption 1
IDD -
VDD=3.3V, VLCD=5V, Ta=25°C
5 15 µA Power save mode1, FR=70Hz
1/3 bias, Frame inverse
Power consumption 2
ILCD
-
VDD=3.3V, VLCD=5V, Ta=25°C
10 20 µA Power save mode1, FR=70Hz
1/3 bias, Frame inverse
Oscillation Characteristics (VDD=2.5~5.5V, VLCD=2.5~5.5V, VSS=0V, Ta=-40~85C, unless otherwise specified)
Parameter
Limits
Symbol
Unit
MIN TYP MAX
Condition
Frame frequency
fCLK
68
80
92 Hz FR = 80Hz setting, VDD=3.3V
MPU interface Characteristics (VDD=2.5~5.5V, VLCD=2.5~5.5V, VSS=0V, Ta=-40~85C, unless otherwise specified)
Parameter
Symbol
MIN.
Limits
TYP.
Unit
MAX.
Condition
Input rise time
tr - - 80 ns
Input fall time
tf - - 80 ns
SCL cycle time
tSCYC 400
-
- ns
“H” SCL pulse width
tSHW
100
-
- ns
“L” SCL pulse width
tSLW
100
-
- ns
SD setup time
tSDS
20
-
- ns
SD hold time
tSDH
50
-
- ns
CSB setup time
tCSS
50
-
- ns
CSB hold time
tCSH
50
-
- ns
“H” CSB pulse time
tCHW
50
-
- ns
tCHW
CSB
SCL
tCSS
tf
tSLW
tSCYC
tSDS
tSHW
tSDH
tr
tCSH
SD
Fig.3 Interface Timing (BU9794KV)
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/16
2010.04 - Rev.A
5 Page 
BU9796FS,BU9795AKV,BU9795AFV,BU9795AGUW,BU9794KV,BU9799KV Technical Note
<BU9794KV>
●Block Diagram
VLCD
LCD voltage generator
COM0……COM3
SEG0……SEG49
common
driver
Segment
driver
＋
－ LCD
BIAS
SELECTOR
＋
common blink timing
DDRAM
－
counter
generator
INHb
OSCIN
VDD
VSS
VSS
OSCILLATOR
Power On Reset
TEST2 TEST1
Command
register
Command
Data Decoder
serial inter face
IF FILTER
CSB SD
SCL
●Pin Arrangement
49
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
COM0
COM1
COM2
COM3
64
32
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
17
Fig.13 Block Diagram (BU9794KV)
Fig.14 Pin Arrangement (BU9794KV)
●Terminal Description
Terminal Terminal No.
INHb
8
TEST1
9
TEST2
10
OSCIN
4
SD
SCL
CSB
VSS
VDD
VLCD
SEG0-49
COM0-3
7
6
5
3
2
1
11-60
61-64
I/O Function
I
Input terminal for turn off display
H: turn on display, L: turn off display
I
Test input (ROHM use only)
Must be connect to VSS
I
Test input (ROHM use only)
Must be connect to VSS
External clock input
I Ex clock and Int clock can be changed by command.
Must be connect to VSS when use internal oscillation circuit.
I serial data input
I serial data transfer clock
I Chip select : “L” active
GND
Power supply
Power supply for LCD driving
O SEGMENT output for LCD driving
O COMMON output for LCD driving
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/16
2010.04 - Rev.A
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BU9794KV.PDF ] | |
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