BU9728AKV_08 Datasheet, PDF (7/24 Pages) Rohm – For 128-140 Segment type LCD LCD Segment Driver

● Recommendation circuit example (BU9728AKV)
It can use as a resistance for the
contrast adjustment when variable
resistance is given to the V3-VSS
space. The resistance of the outside
and resistance with built-in
BU9728AKV become the right
figures in this case.
The value of RC is to decide the
value which met a system referring
to the circuit of the right figure.
5.0V
VDD
V1
V2
V3
1MΩ
1MΩ
1MΩ
RC
VSS
GND
The value (1MΩ) of the
built-in resistance value
inside the figure is
reference value. Value
varies according to
terms of manufacture
and so on.
Fig. BU9728AKV-11 When a contrast adjustment mechanism is used.
● INPUT OUTPUT CIRCUIT (BU9728AKV)
Name I/O
SD
I
SCK
C / D ^{______________}
__________
CS
IN
Circuit
VDD
GND
Name I/O
SEG0 O
～
SEG31
COM0
～
COM3
Circuit
VLCD
OUT
GND
VLCD
GND
Name I/O
OSC1
OSC2
OSC1
OSC2
Circuit
VDD
GND
VDD
GND
Name
RESET ^{_______________________}
I/O
I
IN
Circuit
VDD
VDD
GND
Fig. BU9728AKV-14 INPUT OUTPUT circuit
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