BU9795AKV_11 Datasheet, PDF (7/15 Pages) Rohm – Standard Segment Drivers

BU9795AKV,BU9795AFV,BU9795AGUW,BU9794AKV,BU97950FUV
Technical Note
<BU9795AFV>
●Block Diagram
VDD
LCD voltage generator
COM0……COM3
SEG4……SEG30
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.6 Block Diagram (BU9795AFV)
●Pin Arrangement
40
21
1
20
Fig.7 Pin Arrangement (BU9795AFV)
●Terminal Description
Terminal Terminal No.
INHb
36
TEST
35
OSCIN
31
SD
SCL
CSB
VSS
VDD
VLCD
SEG4-30
COM0-3
34
33
32
30
29
28
1-23,
37-40
24-27
I/O
Function
I
Input terminal for turn off display
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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2011.03 - Rev.A