NJU6676 New Japan Radio Co., Ltd., NJU6676 Datasheet - Page 28

• Manufacturer Part Number: NJU6676
• Description: 64-Common x 132-Segment plus 1-Icon Bit Map Type LCD Controller and Driver
• Manufacturer: New Japan Radio Co., Ltd.

Cout
(d) LCD Driving Voltage Generation Circuits
The LCD driving bias voltage of V1,V2,V3,V4 are generated internally by dividing the V5 voltage
with the internal bleeder resistance.
impedance conversion with voltage follower circuit.
As shown in below, 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.
*1 Short wiring or sealed wiring to the VR terminal is
*2 Following connection of VOUT is required when external
R2
R1
+
required due to the high impedance of VR terminal.
power supply using.
C3
C1
C2
+
+
+
+
+
+
+
Using the internal Power Supply
R3
＊1
C5
C8
C4
C6
C7
When VSS > V5 --- VOUT=V5
When VSS < V5 --- VOUT=VSS
VSS
C1-
C3-
C2+
C2-
VOUT
VSS2
C1+
V1
V4
V5
V5
VDD
V2
V3
VR
NJU6676
And it is supplied to the LCD driving circuits after the
External
Voltage
Generator
Using the external Power Supply
＊2
Reference set up value
VLCD=VDD-V5=9.0 to 10.5V
C1/C2/C3
C4
VSS
C1-
C3-
C2+
C2-
VOUT
C1+
V1
V4
V5
V5
VDD
V2
V3
VR
COUT
R1
R2
R3
C8
NJU6676
PRELIMINARY
NJU6676
0.1 0.47ｕF
500KΩ
2.5MΩ
2MΩ
1.0ｕF
1.0ｕF