HD66712 Datasheet, PDF (54/88 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver

Power Supply for Liquid Crystal Display Drive
1) When an external power supply is used
HD66712U
2) When an internal booster is used
V_CC
V_CC
R
V1
R
V2
R0
V3
R
V4
R
V5
VR
V_EE
(Boosting twice)
V_CC
(Boosting three times)
V_CC
NTC-type
Vci
V_CC
R ^NTC-type
Vci
V_CC
R
thermistor
V1
thermistor
V1
GND
R
GND
R
V2
V2
GND _{1 µF+}
C1
C2
V3
R0
R
GND
1 µF+
C1
C2
R0
V3
R
V4
V4
V5OUT2
R
V5OUT2
R
V5OUT3 ^V5
1 µF ₊
V5OUT3 ^V5
1 µF ₊
GND
1 µF ₊
GND
Notes: 1. Boosting output voltage should not exceed the power supply voltage (2) (13V max.)
in the absolute maximum ratings. Especially, voltage of over 4.3V should not be input
to the reference voltage (Vci) when boosting three times.
2. Vci input terminal is used for reference voltage and power supply for the internal booster.
Input current into the Vci pin needs three times or more of load current through the
bleeder resistor for LCD. So, when it adjusts LCD driving voltage (Vlcd), input voltage
should be controlled with transistor to supply LCD load current. Please notice
connection (+/–) when it uses capacitors with poler.
3. The Vci must be set below the power supply (V_CC).
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