BU9795AKV Datasheet, PDF (5/16 Pages) Rohm – Standard function Segment Drivers

BU9795AKV, BU9795AFV, BU9795AGUW
* BU9795AFV
● Block Diagram
VDD
LCD voltage generator
COM 0……COM 3
SEG4……SEG30
com m on
driver
Seg m ent
driver
VLCD
I N Hb
OSCIN
VSS
＋
－
LCD
BIAS
SELECTOR
＋
common blink timing
DDRAM
counter
generator
－
OSCILLATOR
Pow er On Reset
Com m and
register
Com m and
Data Decoder
serial inter face
IF FILTER
TEST
CSB
SD
SCL
Fig. 2B
BU9795AFV Block diagram
● Pin Arrangement
Technical Note
40
21
1
20
Fig. 3B
BU9795AFV Pin arrangement
● Terminal description
Terminal
INHb
TEST
OSCIO
SD
SCL
CSB
VSS
VDD
VLCD
SEG4-30
COM0-3
Terminal
No.
36
35
31
34
33
32
30
29
28
1-23,
37-40
24-27
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
I Power supply for LCD driving
O SEGMENT output for LCD driving
O COMMON output for LCD driving
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© 2009 ROHM Co., Ltd. All rights reserved.
5/15
2009.07 - Rev.B