HD66760 Datasheet, PDF (75/105 Pages) Hitachi Semiconductor – 104 X 80-dot Graphics LCD Controller/Driver for 256 Colors

HD66760
PS = "00" or
PS = "01"
GND
Vci
VREG
1/2 Vci Voltage
Dividing
0.1µF *5
(B characteristics)
1µF ^*5,8,9
(B characteristics)
V1REF
VLCD
Regulator
VLREF
GND
V1OUT
*10
VR
VLREF regulator
R
V2OUT
R
V3OUT
R0
V4OUT
R
V5OUT
GND
R
HD66760
Step-up
Circuit
V1
V2
V3
LCD
Driver
V4
V5
VLOUT
C6+
C6-
C5+
C5-
C4+
C4-
C3+
C3-
C2+
C2-
C1+
C1-
1µF ^*7
(B characteristics)
1µF ^*7
(B characteristics)
1µF ^*7
(B characteristics)
1µF ^*7
(B characteristics)
1µF ^*7
(B characteristics)
1µF ^*7
(B characteristics)
VLPS
(+) _{1µF *8,9}
(B characteristics)
GND
SEG1 to SEG312
COM1 to COM80
GND
Notes: 1. The reference voltage input (Vci) must be adjusted so that the output voltage after boosting will not
exceed the absolute maximum rating for the liquid-crystal power supply voltage (16.5 V).
2. Vci is both a reference voltage and power supply for the step-up circuit; the sufficient current must be
obtained.
3. Polarized capacitors must be connected correctly.
4. Circuits for temperature compensation should be based on the sample circuits in figures 51 and 52.
5. Adjust the capacitance value of the stabilized capacitor after the LCD panel has been mounted.
6. The breakdown voltages of the capacitors connected to C3+/C3- and C6+/C6- should be three times or
higher than the Vci voltage.
7. The breakdown voltages of the capacitors connected to C1+/C1-, C2+/C2-, C4+/C4-, and C5+/C5-
should be equal to or higher than the Vci voltage.
8. The breakdown voltages of the capacitors connected to VLOUT and V1OUT through V5OUT should be
n times or higher than the Vci voltage (n: step-up magnification).
9. Determine the breakdown voltages of the capacitors used in 6 to 8 above by checking Vci voltage
fluctuation.
10. VLREF regulator is not used when PS = "00". VLREF regulator is used when PS = "01".
Figure 50 Internal Step-up Circuit for LCD Drive Voltage Generation