BU9795AKV Datasheet, PDF (4/16 Pages) Rohm – Standard function Segment Drivers

BU9795AKV, BU9795AFV, BU9795AGUW
Technical Note
* BU9795AKV
● Block Diagram
VDD
LCD voltage generator
COM0……COM3 SEG0……SEG34
common
driver
Segment
driver
VLCD
INHb
OSCIN
VSS
＋
－
LCD
BIAS
SELECTOR
＋
common blink timing
DDRAM
counter
generator
－
OSCILLATOR
Power On Reset
TEST
Command
register
Command
Data Decoder
serial inter face
IF FILTER
CSB
SD
SCL
● Pin Arrangement
37
COM1
COM2
COM3
VLCD
VDD
VSS
OSCIO
CSB
SCL
SD
TEST
INHb
48
24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
13
Fig. 2A
BU9795AKV Block diagram
● Terminal description
Fig. 3A
BU9795AKV Pin arrangement
Terminal
INHb
TEST
OSCIO
SD
SCL
CSB
VSS
VDD
VLCD
SEG0-34
COM0-3
Terminal
No.
48
47
43
46
45
44
42
41
40
1-35
36-39
I/O
Function
Input terminal for turn off display
I
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
Power supply for LCD driving
O SEGMENT output for LCD driving
O COMMON output for LCD driving
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4/15
2009.07 - Rev.B