HD66724 Datasheet, PDF (110/117 Pages) Hitachi Semiconductor – (Graphics LCD Controller/Driver with Key Scan Function)

HD66724/HD66725
14. Applies to the internal oscillator operations using oscillation resistor Rf (figure 62).
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
External resistance
(Rf)
390 kΩ
510 kΩ
560 kΩ
620 kΩ
680 kΩ
750 kΩ
Vcc = 1.8 V
40 kHz
33 kHz
30 kHz
28 kHz
26 kHz
24 kHz
CR oscillation frequency : fosc
Vcc = 2.2 V Vcc = 3.0 V Vcc = 4.0 V
45 kHz
48 kHz
50 kHz
36 kHz
38 kHz
40 kHz
33 kHz
35 kHz
36 kHz
30 kHz
32 kHz
33 kHz
29 kHz
30 kHz
31 kHz
27 kHz
28 kHz
29 kHz
Vcc = 5.0 V
51 kHz
41 kHz
37 kHz
33 kHz
31 kHz
29 kHz
Figure 62 Internal Oscillation
15. Booster characteristics test circuits are shown in figure 63.
(Double boosting)
(Triple boosting)
Vcc _Vci
C1+
C1-
C2+
C2-
VLOUT
VLCD
GND
+
1 µF
+
1 µF
Vcc _Vci
C1+
C1-
C2+
C2-
VLOUT
VLCD
GND
+
1 µF
+
1 µF
+
1 µF
Figure 63 Booster
110