BU9794AKV Datasheet, PDF (2/26 Pages) Rohm – Standard LCD Segment Driver

BU9794AKV MAX 200 Segments (SEG50×COM4)
●Block Diagram / Pin Configuration / Pin Description
VLCD
LCD voltagegenerator
COM0……COM3
SEG0……SEG49
common
driver
egment
driver
＋
－
LCD
BIAS
SELECTOR
＋
－
common
counter
blink timing
generator
DDRAM
INHb
OSCIN
VDD
VSS
VSS
OSCILLATOR
Power On Reset
Command
register
Command
D ata Decoder
serial inter face
IF FILTER
TEST2 TEST1
CSB
SD
SCL
Figure 2. Block Diagram
49
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
COM0
COM1
COM2
COM3
64
32
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
17
Figure 3. Pin Configuration (TOP VIEW)
Terminal
INHb
TEST1
TEST2
OSCIN
SD
Table 1 Pin Description
Terminal
No.
I/O
Function
8
I
Input terminal for turning off display
H : turn on display L : turn off display
9
I
Test input (ROHM use only)
Must be connected to VSS
10
I
Test input (ROHM use only)
Must be connected to VSS
External clock input.
4
I External clock and Internal clock can be selected by command.
Must be connected to VSS when internal oscillation circuit is used.
7
I Serial data input
SCL
6
I Serial data transfer clock
CSB
5
I Chip select : “L” active
VSS
3
GND
VDD
2
Power supply
VLCD
1
Power supply for LCD driving
SEG0 to 49 11 to 60 O SEGMENT output for LCD driving
COM0 to 3 61 to 64 O COMMON output for LCD driving
Handling when
unused
VDD
GND
GND
GND
GND
GND
GND
-
-
-
OPEN
OPEN
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10.Apr.2015 Rev.004