HD66750 Datasheet, PDF (55/96 Pages) Hitachi Semiconductor – 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions

HD66750/1
O PO FF = G ND
0.47 µF*
(B characteristics )
GND
V L CD
VR
V1OUT
R
V2OUT
R0
V3OUT
R
V4OUT
R
V5OUT
R
GND
HD6 6750/1
+
-
V1
+
-
V2
LCD
driver
+
-
V3
+
-
V4
+
-
V5
GND
SEG1 to SEG128
CO M 1 to CO M128
Vci
1 µF (+)
(B Charac-
teris tics )
GND
1 µF ⁽⁺⁾
(B Charac-
teris tics )
1 µF ⁽⁺⁾
(B Charac-
teris tic s)
1 µF ⁽⁺⁾
(B Charac-
teris tics )
1 µF ⁽⁺⁾
(B Charac -
teristic s)
1 µF ⁽⁺⁾
(B Charac -
teristic s)
1 µF ⁽⁺⁾
(B Charac -
teristic s)
Vci
C1+
C1-
C2+
C2-
C3+
C3-
C4+
C4-
C5+
C5-
C6+
C6-
VLOU T
B oo ste r
Not es :1. The reference voltage input (Vci) mus t be adjus ted s o that the outp ut voltage after boos ting will not exc
the ab solute maximum rating f or the liquid-crystal power s up ply v oltage (16.5 V) .
2. Vci is both a reference v oltage and p ow er supp ly for the boost er; connect it to Vcc directly or comb ine it
with a t rans istor so t hat suff icient current can b e obt ained.
3. Polariz ed capacitors m us t be connected correctly.
4. Circuits for temp erature comp ensat ion s hould b e b as ed on the sampl e circuits in figure 37.
5. Adjust the capacitance value of the stab ilized capacitor aft er the LCD panel has been m ounted.
6. The cap acitors connected to C3+/ C3Ð and C 6+ /C 6Ð should three times or more the Vci v oltage.
7. The cap acitors connected to C1+/ C1Ð, C2+/ C2Ð, C 4+ /C 4Ð and C5+/ C5Ð s hould b e more the V ci volta
8. The cap acitors connected to VLOU T/GND and V 1OU T to V5OUT/ GND should be more the N times Vci
v oltage. (N: b oost ing factor)
9. The v oltage of these capacitors should be determi ned with fluctuation of voltage.
Figure 36 Internal Booster for LCD Drive Voltage Generation
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