BU9799KV Datasheet, PDF (2/28 Pages) Rohm – Standard LCD Segment Driver

BU9799KV MAX 200 segments (SEG50×COM4)
●Block Diagram / Pin Configuration / Pin Description
COM0 …… COM3 SEG0 … SEG49
VLCD
LCD voltage generator
Common
driver
Segment
driver
＋
－
＋
LCD
－
BIAS
SELECTOR
Common
counter
Blink timing
generator
DDRAM
＋
－
INHb
OSCIN
VDD
VSS
VSS
OSCILLATOR
Power On Reset
Command
register
Command
Data Decoder
Serial interface
IF FILTER
TEST3 TEST2
TEST1
SDA
SCL
49
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
COM0
COM1
COM2
COM3
64
Datasheet
32
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
17
Figure 2. Block Diagram
Figure 3. Pin Configuration (TOP VIEW)
Terminal
INHb
TEST1
TEST2
TEST3
OSCIN
SDA
Terminal No.
8
9
10
5
4
7
Table 1 Pin Description
I/O
Function
I
Input terminal for turning off display
H: turn on display L: turn off display
Test input (ROHM use only)
I
TEST1=”L”: POR circuit enable
TEST1=”H”: POR circuit disable,
refer to “Cautions in Power ON/OFF”
I
Test input (ROHM use only)
Must be connected to VSS
I
Test input (ROHM use only)
Must be connected to VSS
External clock input
I External clock and Internal clock modes can be selected by command.
Must be connected to VSS when use internal oscillation circuit.
I Serial data input
SCL
6
I Serial data transfer clock
VSS
3
GND
VDD
2
Power supply
VLCD
1
Power supply for LCD driving
SEG0-49
11-60
O SEGMENT output for LCD driving
COM0-3
61-64
O COMMON output for LCD driving
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TSZ02201-0A0A2D300040-1-2
23.Jan.2015 Rev.003