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PDF BU9795AGUW Data sheet ( Hoja de datos )
| Número de pieza | BU9795AGUW | |
| Descripción | Standard LCD Segment Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
Standard LCD Segment Drivers
BU9795Axxx Series MAX 140 segments (SEG35×COM4)
●Features
Integrated RAM for display data (DDRAM) :
35 × 4bit (Max 140 Segment)
LCD drive output :
4 Common output, Max 35Segment output
Integrated Buffer AMP for LCD driving
Integrated Oscillator circuit
No external components
Low power consumption design
●Applications
Telephone
FAX
Portable equipment (POS, ECR, PDA etc.)
DSC
DVC
Car audio
Home electrical appliance
Meter equipment
etc.
●Key Specifications
■ Supply Voltage Range:
+2.5V to +5.5V
■ Operating Temperature Range: -40°C to +85°C
■ Max Segments:
BU9795AKV
140 Segments
BU9795AFV
108 Segments
BU9795AGUW
124 Segments
BU9795AKS2
140 Segments
■ Display Duty:
1/4
■ Bias:
1/2, 1/3 selectable
■ Interface:
3wire serial interface
●Packages
W (Typ.) x D (Typ.) x H (Max.)
VQFP48C
9.00mm x 9.00mm x 1.60mm
VBGA048W040
4.00mm x 4.00mm x 0.90mm
●Typical Application Circuit
VDD
SSOP-B40
SQFP-T52M
13.60mm x 7.80mm x 2.00mm 12.00mm x 12.00mm x 1.40mm
Controller
VDD
VLCD
INHb
CSB
SD
SCL
OSCIN
TEST
VSS
COM0
COM1
COM2
COM3
SEG0
SE・G1
・
・
・
SEG34
Segment
LCD
・
・
・
Internal oscillator circuit mode
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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BU9795Axxx Series MAX 140 segments (SEG35×COM4)
●Block Diagrams / Pin Configurations / Pin Descriptions – continued
Datasheet
BU9795AKS2
VDD
VLCD
INHb
OSCIN
VSS
LCD voltage generator
COM0…… COM3
SEG0 … SEG34
Common
driver
Segment
driver
＋
－ LCD BIAS
SELECTOR
＋
－
Common Blink timing
counter
generator
DDRAM
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
Serial inter face
IF FILTER
TEST
CSB
SD
SCL
Figure 8. Block Diagram
39
40
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
COM0
COM1
52
1
27
26
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
14
13
Figure 9. Pin Configuration (TOP VIEW)
Pin name
INHb
TEST
OSCIN
SD
SCL
CSB
VSS
VDD
VLCD
SEG0-34
COM0-3
Pin No.
13
12
7
10
9
8
6
5
4
14-28,
30-36
38-50
51-52,
1-2
Table 4 Pin Description
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
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
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
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BU9795Axxx Series MAX 140 segments (SEG35×COM4)
Datasheet
●Function Description
○Command and data transfer method
○3-SPI (3wire Serial interface)
This device is controlled by 3-wire signal (CSB, SCL, and SD).
First, Interface counter is initialized with CSB=“H", and CSB=“L” makes SD and SCL input enable.
The protocol of 3-SPI transfer is as follows.
Each command starts with Command or Data judgment bit (D/C) as MSB data, followed by D6 to D0 during
CSB =“L”.
(Internal data is latched at the rising edge of SCL, it is converted to 8bits parallel data at the falling edge of 8th CLK.)
CSB
Command
Command/Data
SCL
SD D/C D6 D5 D4 D3 D2 D1 D0 D/C D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5
D/C = “H” : Command D/C = “L” : Data
Figure 15. 3-SPI Command/Data transfer format
○Command transfer method
After CSB=“H”→”L”, 1st byte is always a command input.
MSB of the command input data will be judged that the next byte data, it is a command or display data (This bit is called
“command or data judgment bit”).
When set “command or data judge bit”=‘1’, next byte will be (continuously) command.
When set “command or data judge bit”=‘0’, next byte data is display data.
1 Command
1 Command
1 Command
0 Command
Display Data …
Once it becomes display data transfer condition, it will not be back to command input condition even if D/C=1.
So if you want to send command data again, please set CSB=“L”→”H”.
(CSB “L”→”H” will cancel data transfer condition.)
Command transfer is done by 8bits unit, so if CSB=“L”→”H” with less than 8bits data transfer, command will be
cancelled.
It will be able to transfer command with CSB=“L” again.
In Case Of Command Transfer
CSB
Command
SCL
12345678
SD 1
12345678
STATUS
DISCTL Command Transfer
Command Cancelled (Less Than 8bits)
Command
12345678
DISPON Command Transfer
Figure 16. Command transfer format
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
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TSZ02201-0A0A2D300020-1-2
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11 Page | ||
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