hd66717 Renesas Electronics Corporation., hd66717 Datasheet - Page 55

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

The HD66717’s internal operational amplifiers have a reduced drive current to save current consumption;
when the internal operational amplifiers cannot fully drive the LCD panel used, an appropriate capacitors
must be inserted between each output of V1OUT to V5OUT and V
output (Figure 33). Especially, the capacitors for V1OUT and V4OUT must be inserted when 1/26 duty
or 1/34 duty drives.
Figure 33 Operational Amplifier Output Stabilization Circuit Example
V
Note : The capacitors for V1OUT and V4OUT must be inserted when 1/26 duty or 1/34 duty drives.
CC
0.1 F to 0.5 F*
+
GND
+
+
+
+
GND
+
0.47 F
to 1 F
0.47 F
to 1 F
+
+
0.47 F
to 1 F
V5OUT3
V5OUT3
V5OUT2
V1OUT
V4OUT
V2OUT
V3OUT
V5OUT
+
V
V
Vci
C1
C2
V2
V2
V3
CC
EE
VR
R
R
R
R
R
R
OPOFF = GND
Booster
+
+
–
+
–
+
–
+
–
–
HD66717
V
V1
V2
multiplexing
V3
V4
V5
CC
driver
LCD
CC
to stabilize the operational amplifier
SEG1–SEG60
COM1–COM32
COMS1–COMS2
HD66717
507