BU9795AKS2 Datasheet, PDF (4/40 Pages) Rohm – Standard LCD Segment Drivers

BU9795Axxx Series MAX 140 segments (SEG35×COM4)
●Block Diagrams / Pin Configurations / Pin Descriptions - continued
Datasheet
BU9795AGUW
VDD
VLCD
INHb
OSCIN
VSS
LCD voltage generator
COM0…… COM3
SEG0 … SEG32
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 6. Block Diagram
1
2
3
4
5
6
7
G (NC) SEG13 SEG15 SEG18 SEG20 SEG22 (NC)
F SEG11 SEG12 SEG16 SEG17 SEG21 SEG23 SEG24
E SEG9 SEG10 SEG14 SEG19 SEG25 SEG27 SEG26
D SEG7 SEG6 SEG8 SEG5 SEG30 SEG28 SEG29
C SEG4 SEG3 SEG2 CSB COM3 SEG32 SEG31
B
INHb SD
VSS VDD COM1 COM0
A (NC) TEST2 SCL OSCIN VLCD COM2 (NC)
Figure 7. Pin Configuration (BOTTOM VIEW)
Pin name
INHb
TEST
OSCIN
SD
SCL
CSB
VSS
VDD
VLCD
SEG2 to 32
COM0 to 3
Table 3 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
I Power supply for LCD driving
O SEGMENT output for LCD driving
O COMMON output for LCD driving
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TSZ02201-0A0A2D300020-1-2
12.July.2012 Rev.002