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| NJU6655B Datasheet, PDF (37/54 Pages) New Japan Radio – 64-common X 160-segment + 1-icon common Bitmap LCD Driver | |||
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NJU6655B
(3-3) LCD Driving Voltage Generation Circuits
The LCD driving bias voltage of V1,V2,V3,V4 are generated internally by dividing the VLCD (VLCD=VDD-V5) voltage
with the internal bleeder resistance. And it is supplied to the LCD driving circuits after the impedance conversion with
voltage follower circuit.
As shown in Fig 4, Five capacitors are required to connect to each LCD driving voltage terminal for voltage stabilizing.
And the value of capacitors C4, C5, C6, C7, and C8 are determined depending on the actual LCD panel display evaluation.
Using the internal Power Supply
Using the external Power Supply
C1 +
+
COUT
C3
+
C2
VSS
VSS2
C1-
C1+
C3-
C2+
C2-
VSS
C1-
C1+
C3-
(2)
C2+
C2-
VOUT
R3
NJU6655B
V5
*1
R2
VR
*2
(1)
VOUT
V5
VR
NJU6655B
R1
+
C4
+
C5
+
C6
+
C7
+
C8
VDD
V1
V2
V3
V4
V5
VDD
V1
V2
External
Voltage
V3
Generator
V4
V5
Fig.4 LCD Driving Voltage Generation Circuits
Reference set up value
*1 Short wiring or sealed wiring to the VR terminal is required due to
VLCD=VDD-V5=7.0 to 10.5V
the high impedance of VR terminal.
*2 Following connection of VOUT is required when external power
supply using.
(1): When VSS > V5 --- VOUT=V5
(2): When VSS < V5 --- VOUT=VSS
COUT
C1~C3, C8
C4~C7
R1
R2
R3
~1.0uF
~1.0uF
0.1 ~ 0.47uF
232kâ¦
115kâ¦
1.053Mâ¦
Ver.2009-12-02
- 37 -
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