HD66727 Datasheet, PDF (93/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

14. Applies to the internal oscillator operations using oscillation resistor Rf (Figure 54).
HD66727
OSC1 _{Since the oscillation frequency varies depending on the OSC1 and OSC2}
R_f
pin capacitance, the wiring length to these pins should be minimized.
OSC2
Referential data
200
160
150
f_OSC (kHz) 100
50
V_CC = 3 V (typ.)
V_CC = 5 V (typ.)
0
100 ¹⁶⁰ 200
300
400
500
600
700
800
R_f (kΩ)
Figure 54 Internal Oscillation
15. Booster characteristics test circuits are shown in Figure 55.
( Double boosting )
( Triple boosting )
V_CC
Vci
C1
C2
V5OUT2
V5OUT3
V_EE
GND
1 µF
+
1 µF
+
V_{CC Vci}
C1
C2
V5OUT2
V5OUT3
GND ^VEE
1 µF
+
1 µF
+
1 µF
+
Figure 55 Booster
93