HD66750 Datasheet, PDF (90/96 Pages) Hitachi Semiconductor – 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions

HD66750/1
10. Applies to the internal oscillator operations using external oscillation resistor Rf (figure 59 and table
28).
OSC1
Rf
Since the oscillation frequency varies depending on the OSC1 and OSC2 pin
OSC2
capacitance, the wiring length to these pins should be minimized.
Figure 59 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
86 kHz
111 kHz
130 kHz
70 kHz
86 kHz
100 kHz
64 kHz
79 kHz
92 kHz
60 kHz
74 kHz
86 kHz
57 kHz
69 kHz
79 kHz
54 kHz
64 kHz
74 kHz
49 kHz
59 kHz
67 kHz
46 kHz
54 kHz
61 kHz
Vcc = 4.0 V
140 kHz
108 kHz
98 kHz
91 kHz
84 kHz
78 kHz
71 kHz
65 kHz
11. Booster characteristics test circuits are shown in figure 60.
(Five to seven times b oosting
V cc V ci
C1+
C1-
C2+
C2-
C3+
C3-
C4+
C4-
C5+
C5-
C6+
C6-
V LOUT
GND ^{V LCD}
+
1 µF
+
1 µF
+
1 µF
+
1 µF
+
1 µF
+
1 µF
+ _{1 µF}
Figure 60 Booster
90