HD66740 Datasheet, PDF (11/95 Pages) Hitachi Semiconductor – 112 x 80-dot Graphics LCD Controller/Driver

HD66740
Table 2
Signals
C1+, C1–
C2+, C2–
C3+, C3–
C4+, C4–
RESET*
OPOFF
VccDUM
GNDDUM
Dummy
TEST
VTEST1
VTEST2
VTEST3
Pin Functional Description (cont)
Number of
Pins
I/O
Connected to Functions
8
— Booster
External capacitance should be connected here for
capacitance boosting.
6
— Booster
External capacitance should be connected here when
capacitance using the triple or more booster.
6
— Booster
External capacitance should be connected here when
capacitance using the quadruple and five-times booster.
6
— Booster
External capacitance should be connected here when
capacitance using the five-times booster.
1
I
MPU or external Reset pin. Initializes the LSI when low.
R-C circuit
1
I
V_CC or GND
Turns the internal operational amplifier off when
OPOFF = V_CC, and turns it on when OPOFF = GND. If
the amplifier is turned off (OPOFF = V_CC), V1 to V5
must be supplied to the V1OUT to V5OUT pins.
1
O
Input pins
Outputs the internal V_CC level; shorting this pin sets the
adjacent input pin to the V_CC level.
1
O
Input pins
Outputs the internal GND level; shorting this pin sets
the adjacent input pin to the GND level.
5
——
Dummy pad. Must be left disconnected.
1
I
GND
Test pin. Must be fixed at GND level.
1
I
GND or V_CC
Adjusts the driving capability of the internal operationa
amplifier for the LCD. This signal enters the normal
drive mode in the GND side, and it enters the high-
power drive mode in the V_CC side. When the display
quality is not sufficient, use the high-power drive mode
even though the power-consumption current is large.
1
——
Test pin. Must be left disconnected.
1
I
V_CC or GND
Adjusts the driving capability of the internal operationa
amplifier for the LCD. This signal enters the normal
drive mode or high-power mode in the GND side
according to the VTEST1 pin setting, and it enters the
low-power drive mode in the V_CC side. Use this signa
in the low-power mode so that the display quality is no
lowered.
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