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PDF BU97931FV Data sheet ( Hoja de datos )
| Número de pieza | BU97931FV | |
| Descripción | Multifunction LCD Segment Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
Multifunction LCD Segment Driver
BU97931FV MAX 112 segments (SEG28×COM4)
●Features
Integrated RAM for display data (DDRAM):
28 x 4 bit (Max 112 Segment)
LCD drive output:
4 Common output, Max 28 Segment output
Integrated 1ch LED driver circuit
Segment/GPO (Max 5port) output mode selectable
Support PWM generation from ext. or internal clock
(Resolution: 8bit)
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)
●Key Specifications
■ Supply Voltage Range:
+1.8V to +3.6V
■ LCD drive power supply Range: +2.7V to +5.5V
■ Operating Temperature Range: -40°C to +85°C
■ Max Segments:
112 Segments
■ Display Duty:
Static, 1/3, 1/4 selectable
■ Bias:
Static, 1/3
■ Interface:
3wire serial interface
●Package
W (Typ.) x D (Typ.) x H (Max.)
●Applications
Telephone
FAX
Portable equipment (POS, ECR, PDA etc.)
DSC
DVC
Car audio
Home electrical appliance
Meter equipment
etc.
SSOP-B40
13.60mm x 7.80mm x 2.00mm
●Typical Application Circuit
LED/GPO using case
VLED=5.0V
.0V 3.3V
VLCD
VDD
LED
BU97931FV
*Regarding resistor value
Please detect the value according to
input current value (current MAX = 20mA)
SEG27(GPO0) to
SEG23(GPO4
Other
device
VSS
CSB SD SCL CLKIN
SEG0 toSEG22
COM0 to COM3
LCD
Input signal from controller
＊ CLKIN
External CLK input terminal
In case being unused, connect to VSS or be opened.
Figure 1. Typical application circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111･14･001
○This product is not designed for protection against radioactive rays.
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TSZ02201-0A0A2D300070-1-2
10.Apr.2015 Rev.004
1 page  
BU97931FV MAX 112 segments (SEG28×COM4)
●I/O equivalent circuit
VLCD
VDD
VSS
VSS
VDD
CSB, SD,
SCL, CLKIN
VSS
VLCD
SEG23-26
VSS
VLC
D
SEG0-2
2COM0-3
VSS
LED
VSS
Figure 5. I/O equivalent circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
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TSZ02201-0A0A2D300070-1-2
10.Apr.2015 Rev.004
5 Page 
BU97931FV MAX 112 segments (SEG28×COM4)
●Detailed Command Descriptions
D/C, Data / Command judgment bit (MSB)
For details, please refer to 3-wire serial I/F
○Mode Set (MODESET)
1st byte command
2nd byte command
MSB
LSB
D/C D6 D5 D4 D3 D2 D1 D0 Hex Reset
1 0 0 0 0 0 0 1 81h
-
0 0 0 0 P3 P2 P1 P0 -
00h
Display Set
Condition
Display OFF
Display ON
P3 Reset state
0○
1
Display OFF: No LCD driving mode (Output: VSS Level)
Turn off OSC circuit and LCD power supply circuit. (Synchronized with frame freq)
Display ON: LCD driving mode
Turn on OSC circuit and LCD power supply circuit.
Read data from DDRAM and display to LCD.
LED port and GPO port output states are not influenced by a Display on/off state
Output state is decided by command setup (OUTSET, GPOSET, PWMSET).
For more details, please refer to each command description.
LCD drive mode set
Condition
Frame inversion
Line inversion
P2 Reset state
0○
1
Current mode set
Condition
Power save mode1
Power save mode2
Normal mode
High power mode
P1 P0 Reset state
00
○
01
10
11
(Reference data of consumption current)
Condition
Current consumption
Power save mode 1
×1.0
Power save mode 2
×1.7
Normal mode
×2.7
High power mode
×5.0
* The value changes according to the panel load.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
11/28
TSZ02201-0A0A2D300070-1-2
10.Apr.2015 Rev.004
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BU97931FV.PDF ] | |
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