HD66712 Datasheet, PDF (13/88 Pages) Hitachi Semiconductor – Dot-Matrix Liquid Crystal Display Controller/Driver

HD66712U
Table 1 Pin Functional Description (cont)
Signal
CL1
CL2
D
M
EXT
Number
of Pins
1
1
1
1
1
V1 to V5 5
V_CC/GND 2
OSC1/
2
OSC2
Vci
1
V5OUT2 1
V5OUT3 1
C1/C2
2
RESET* 1
TEST
1
Device
I/O Interfaced with Function
O Extension driver When EXT = high, outputs the extension driver latch
pulse.
O Extension driver When EXT = high, outputs the extension driver shift
clock.
O Extension driver When EXT = high, outputs extension driver data; data
from the 61st dot on is output.
O Extension driver When EXT = high, outputs the extension driver AC
signal.
I
—
When EXT = high, outputs the extension driver
control signal. When EXT = low, the signal becomes
tristate and can suppress consumption current.
— Power supply
Power supply for LCD drive
V_CC –V5 = 11V (max)
— Power supply
V_CC: +2.7V to +5.5V, GND: 0V
— Oscillation resistor When crystal oscillation is performed, an external
clock
resistor must be connected. When the pin input is an
external clock, it must be input to OSC1.
I
—
Inputs voltage to the booster to generate the liquid
crystal display drive voltage.
Vci is reference voltage and power supply for the
booster.
Vci = 1.0V to 5.0V ≤ V_CC
O V5 pin/ booster Voltage input to the Vci pin is boosted twice and
capacitance
output. When the voltage is boosted three times, the
same capacitance as that of C1–C2 should be
connected here.
O V5 pin
Voltage input to the Vci pin is boosted three times and
output.
— Booster
capacitance
External capacitance should be connected here when
using the booster.
I
—
Reset pin. Initialized to “low.”
I
—
Test pin. Should be wired to ground.
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