HD66740 Datasheet, PDF (83/95 Pages) Hitachi Semiconductor – 112 x 80-dot Graphics LCD Controller/Driver

HD66740
11. Applies to the internal oscillator operations using external oscillation resistor Rf (figure 44 and table
28).
OSC1 _{Since the oscillation frequency varies depending on the OSC1 and OSC2 pin}
Rf
capacitance, the wiring length to these pins should be minimized.
OSC2
Figure 44 Internal Oscillation
Table 28 External Resistance Value and R-C Oscillation Frequency (Referential Data)
External
Resistance (Rf)
200 kΩ
270 kΩ
300 kΩ
330 kΩ
360 kΩ
390 kΩ
430 kΩ
470 kΩ
R-C Oscillation Frequency: fosc
Vcc = 1.8 V Vcc = 2.2 V Vcc = 3.0 V
89 kHz
103kHz
115 kHz
70 kHz
80 kHz
88 kHz
65 kHz
73 kHz
80 kHz
60 kHz
68 kHz
74 kHz
55 kHz
62 kHz
68 kHz
52 kHz
58 kHz
64 kHz
48 kHz
53 kHz
58 kHz
44 kHz
48 kHz
52 kHz
Vcc = 3.6 V
121 kHz
92 kHz
83 kHz
77 kHz
71 kHz
66 kHz
60 kHz
54 kHz
12. Booster characteristics test circuits are shown in figure 45.
(Quadruple boosting)
(Five-times boosting)
Vcc Vci
C1+
C1-
C2+
C2-
C3+
C3-
C4+
C4-
VLOUT
GND ^VLCD
+
1 µF
+
1 µF
+
1 µF
+
1 µF
Vcc Vci
C1+
C1-
C2+
C2-
C3+
C3-
C4+
C4-
VLOUT
GND ^VLCD
+ _{1 µF}
+
1 µF
+ _{1 µF}
+
1 µF
+ _{1 µF}
Figure 45 Booster
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