hd66717 Renesas Electronics Corporation., hd66717 Datasheet - Page 52

• Manufacturer Part Number: hd66717
• Description: Low-power Dot-matrix Liquid Crystal Display Controller/driver -
• Manufacturer: Renesas Electronics Corporation.

HD66717
504
Figure 30 External Power Supply Circuit Example for LCD Drive Voltage Generation
Note: 1. Potential differences between V
2. When the internal operational amplifiers cannot fully drive the LCD panel used, an appropriate capacitor
V
V
Short-circuited
V
V
EE
EE
CC
CC
particularly for low-duty drive such as 1-line display.
must be inserted between each output of V1OUT to V5OUT and V
operational amplifier output.
GND
GND
AGND
AGND
V
V
V
V
EE
EE
V2
V3
V2
V3
CC
CC
VR
VR
R
R
R
R
R
R
R
R
R
R
R
R
a) 3- or 4-line display with 1/6 bias
OPOFF = GND
OPOFF = GND
b) 1- or 2-line display with 1/4 bias
+
+
+
+
+
+
+
–
+
+
+
–
–
–
–
–
–
–
–
–
CC
HD66717
HD66717
V1
V2
V3
V4
V5
V1
V2
V3
V4
V5
and V1 and between V5 and V
multiplexing
multiplexing
LCD static
LCD static
driver
driver
driver
driver
LCD
LCD
EE
CC
must be 0.4V or greater,
SEG1–SEG60
COM1–COM32
COMS1–COMS2
ASEG1–ASEG10
ACOM
SEG1–SEG60
COM1–COM16
COMS1–COMS2
ASEG1–ASEG10
ACOM
to stabilize the