BU9795AKV_11 Datasheet, PDF (8/15 Pages) Rohm – Standard Segment Drivers

BU9795AKV,BU9795AFV,BU9795AGUW,BU9794AKV,BU97950FUV
Technical Note
<BU9795AGUW>
●Block Diagram
VDD
LCD voltage generator
COM0……COM3
SEG2……SEG32
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
Fig.8 Block Diagram (BU9795AGUW)
●Pin Arrangement
1
2
3
4
5
6
7
G (NC) SEG13 SEG15 SEG18 SEG20 SEG22 (NC)
F SEG11 SEG12 SEG16 SEG17 SEG21 SEG23 SEG24
E SEG9 SEG10 SEG14 SEG19 SEG25 SEG27 SEG26
D SEG7 SEG6 SEG8 SEG5 SEG30 SEG28 SEG29
C SEG4 SEG3 SEG2 CSB COM3 SEG32 SEG31
B
INHb
SD
VSS VDD COM1 COM0
A (NC) TEST2 SCL OSCIN VLCD COM2 (NC)
Fig.9 Pin Arrangement (BU9795AGUW)
●Terminal Description
Terminal
I/O
INHb
I
TEST
I
OSCIN
I
SD
I
Function
Input terminal for turn off display
H: turn on display L: turn off display
Test input (ROHM use only)
Must be connect to VSS
External clock input
Ex clock and Int clock can be changed by command.
Must be connect to VSS when use internal oscillation circuit.
serial data input
SCL
I serial data transfer clock
CSB
I Chip select : “L” active
VSS
- GND
VDD
- Power supply
VLCD
- Power supply for LCD driving
SEG2-32
O SEGMENT output for LCD driving
COM0-3
O COMMON output for LCD driving
(Caution) About terminal number, please refer to above pin arrangement
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8/14
2011.03 - Rev.A