BU9728AKV_08 Datasheet, PDF (13/24 Pages) Rohm – For 128-140 Segment type LCD LCD Segment Driver

* 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. BU9795AKV /AFV /AGUW-2B
BU9795AFV Block diagram
● Pin Arrangement
40
21
1
20
Fig. BU9795AKV /AFV /AGUW-3B
BU9795AFV Pin arrangement
● Terminal description
Terminal
INHb
TEST
OSCIO
SD
SCL
CSB
VSS
VDD
VLCD
SEG4-30
COM0-3
Terminal
No.
I/O
Function
36
I
Input terminal for turn off display
H: turn on display L: turn off display
35
I
Test input (ROHM use only)
Must be connect to VSS
External clock input
31
I Ex clock and Int clock can be changed by command.
Must be connect to VSS when use internal oscillation circuit.
34
I serial data input
33
I serial data transfer clock
32
I Chip select : “L” active
30
GND
29
Power supply
28
I Power supply for LCD driving
1-23,
37-40
24-27
O SEGMENT output for LCD driving
O COMMON output for LCD driving
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