BU9797FUV Datasheet, PDF (2/28 Pages) Rohm – Integrated Buffer AMP for LCD Driving

BU9797FUV MAX 144 segments (SEG36×COM4)
Datasheet
Block Diagram / Pin Configuration / Pin Description
BU9797FUV
VDD
VLCD
OSCIN
VSS
LCD voltage generator
COM0……COM3 SEG0…… SEG35
Common
driver
Segment
driver
＋
－
LCD
BIAS
SELECTOR
＋
－
Common Blink timing
counter generator
DDRAM
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
Serial interface
IF FILTER
SDA
SCL
SEG31
SEG32
SEG33
SEG34
SEG35
COM0
COM1
COM2
COM3
VLCD
VDD
VSS
TEST1
OSCIN
SCL
SDA
NC
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
Figure 2. Block Diagram
Figure 3. Pin Configuration (TOP VIEW)
Pin Name
TEST1
NC
OSCIN
SDA
SCL
VSS
VDD
VLCD
SEG0 to 35
COM0 to 3
Pin No.
13
17
14
16
15
12
11
10
18-48,
1-5
6-9
Table 1. Pin Description
I/O
I
Test input (ROHM use only)
Must be connect to VSS
Function
OPEN terminal
External clock input
I External clock and Internal clock can be selected by command
Must be connect to VSS when use internal oscillator
I/O Serial data in-out terminal
I Serial clock for data transfer terminal
Ground
Power supply
Power supply for LCD driving
O SEGMENT output for LCD driving
O COMMON output for LCD driving
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TSZ02201-0P4P0D300820-1-2
5.Aug.2014 Rev.001