BU9728AKV_08 Datasheet, PDF (14/24 Pages) Rohm – For 128-140 Segment type LCD LCD Segment Driver

* 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
Command
register
Command
Data Decoder
serial inter face
IF FILTER
TEST
CSB
SD
SCL
Fig. BU9795AKV /AFV /AGUW-2C
BU9795AGUW Block diagram
● 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 OSCIO VLCD COM2 (NC)
Fig. BU9795AKV /AFV /AGUW-3C
BU9795AGUW Pin arrangement
● Terminal description
Terminal
I/O
Function
INHb
TEST
OSCIO
SD
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
SCL
I serial data transfer clock
CSB
I Chip select : “L” active
VSS
GND
VDD
Power supply
VLCD
I 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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