hd66712u Renesas Electronics Corporation., hd66712u Datasheet - Page 54

• Manufacturer Part Number: hd66712u
• Description: Dot-matrix Liquid Crystal Display Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Power Supply for Liquid Crystal Display Drive
1) When an external power supply is used
2) When an internal booster is used
NTC-type
thermistor
Notes: 1.
V
GND
CC
2.
3.
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.
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.
The Vci must be set below the power supply (V
1 F +
1 F
+
GND
(Boosting twice)
C1
C2
V5OUT2
V5OUT3
Vci
GND
V
V
V1
V2
V3
V4
V5
CC
CC
R0
R
R
R
R
VR
V
EE
R0
R
R
R
R
V
V1
V2
V3
V4
V5
NTC-type
thermistor
CC
CC
V
GND
CC
).
1 F +
1 F
1 F
+
+
GND
(Boosting three times)
Vci
GND
C1
C2
V5OUT2
V5OUT3
V
V1
V2
V3
V4
V5
CC
R
R
R0
R
R
HD66712U
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