HD66717 Datasheet, PDF (85/90 Pages) Hitachi Semiconductor – (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver)

14. Applies to the internal oscillator operations using oscillation resistor R_f (Figure 49).
HD66717
OSC1 Since the oscillation frequency varies depending on the OSC1 and
R_f
OSC2 pin capacitance, the wiring length to these pins should be
OSC2 ^minimized.
Referential data
200
160
150
100
V_CC=5V (typ.)
V_CC=3V (typ.)
50
0
100
150
200
300
400
500
600
700
800
R_f (kΩ)
Figure 49 Internal Oscillation
15. Booster characteristics test circuits are shown in Figure 50.
( Double boosting )
V_CC
Vci
C1
C2
V5OUT2
V5OUT3
V_EE
GND
1 µF
+
1 µF
+
( Triple boosting )
V_{CC Vci}
C1
C2
V5OUT2
V5OUT3
GND ^VEE
1 µF
+
1 µF
+
1 µF
+
Figure 50 Booster
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