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| HD66712 Datasheet, PDF (81/88 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver | |||
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HD66712U
10. Input/output current is excluded. When input is at an intermediate level with CMOS, the excessive
current flows through the input circuit to the power supply. To avoid this from happening, the input
level must be fixed high or low.
11. Applies only to external clock operation.
Th
Tl
Oscillator
OSC1
Open
OSC2
0.7 VCC
0.5 VCC
0.3 VCC
tfcp
tfcp
Duty = Th à 100%
Th + Tl
12. Applies only to the internal oscillator operation using oscillation resistor Rf.
OSC1
Rf
OSC2
Referential data
i) HD66712S
R f : 75 k⦠± 2% (when VCC = 3V to 4V)
R f : 91 k⦠± 2% (when VCC = 4V to 5V)
ii) HD66712U
Rf : 110 k⦠± 2% (when VCC = 3V to 4V)
Rf : 130 k⦠± 2% (when VCC = 4V to 5V)
Since the oscillation frequency varies depending on the OSC1 and
OSC2 pin capacitance, the wiring length to these pins should be minimized.
VCC = 5V
VCC = 3V
400
400
300
270
200
50
300
270
HD66712U (typ.) 200
HD66712S (typ.)
91 100 130 150
Rf (kâ¦)
50 75 100 110
Rf (kâ¦)
HD66712U (typ.)
HD66712S (typ.)
150
444
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