BU9795AKS2 Datasheet, PDF (3/40 Pages) Rohm – Standard LCD Segment Drivers

BU9795Axxx Series MAX 140 segments (SEG35×COM4)
●Block Diagrams / Pin Configurations / Pin Descriptions - continued
Datasheet
BU9795AFV
VDD
LCD voltage generator
COM0…… COM3
SEG0 … SEG30
Common
driver
Segment
driver
VLCD
INHb
OSCIN
VSS
＋
－
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 4. Block Diagram
Figure 5. Pin Configuration (TOP VIEW)
Pin name
INHb
TEST
OSCIN
SD
SCL
CSB
VSS
VDD
VLCD
SEG4 to 30
COM0 to 3
Pin No.
36
35
31
34
33
32
30
29
28
1 to 23,
37 to 40
24 to 27
Table 2 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