hd66740 Renesas Electronics Corporation., hd66740 Datasheet - Page 47

• Manufacturer Part Number: hd66740
• Description: 112 X 80-dot Graphics Lcd Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Notes: 1. The reference voltage input (Vci) must be adjusted so that the output voltage after boosting will not exceed
2. Vci is both a reference voltage and power supply for the booster; connect it to Vcc directly or combine it
3. Polarized capacitors must be connected correctly.
4. Circuits for temperature compensation should be based on the sample circuit in figure 24.
1 F
the absolute maximum rating for the liquid-crystal power supply voltage (17 V). Particularly, Vci must be
3.3 V or less for five-times boosting.
with a transistor so that sufficient current can be obtained.
GND
GND
Vci
+
Figure 23
0.1 F
to 0.5 F
+
Figure 24
+
1 F
1 F
1 F
1 F
+
Internal Booster for LCD Drive Voltage Generation
+
+
+
+
+
+
Thermistor
VLOUT
V1OUT
V2OUT
V3OUT
V4OUT
V5OUT
Temperature Compensation Circuit
V
GND
C1+
C2+
C3+
C3+
LCD
C1-
C2-
C3-
C3-
Vcc
Vci
VR
R
R
R
R
R
0
OPOFF = GND
GND
47
Booster
Tr
+
+
+
+
+
-
-
-
-
-
HD66740
HD66740
V1
V2
V3
V4
V5
GND
Vcc
Vci
driver
LCD
SEG1 to SEG112
COM1 to COM80
HD66740