HD44780U 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD44780U

Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

Hitachi -> Renesas Electronics 

HD66727

Table 3 Pin Functional Description (cont)

Signal

Vci

Number of

Pins

I/O

2

I

V5OUT2 3

O

V5OUT3 2

O

C1, C2

6

—

RESET* 1

I

EXM

1

I

OPOFF 1

I

VCC dummy 2

0

TEST

1

I

Connected to Function

Power supply

VEE pin/booster

capacitance

Inputs a reference voltage and supplies power to the

booster; generates the liquid crystal display drive

voltage from the operating voltage.

Vci = 1.0V to 5.0V ≤ VCC

Voltage input to the Vci pin is boosted twice and output.

When the voltage is boosted three times, the same

capacitance as that of C1–C2 should be connected

here.

VEE 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.

MPU or external Reset pin. Initializes the LSI when low. Be sure to input

R-C circuit

this signal after power-on.

MPU

VCC or GND

External alternating signal used for annunciator display

in the standby mode. If annunciator display is not used,

EXM must be fixed to VCC or GND.

Turns the internal operational amplifier off when OPOFF

= VCC, and turns it on when OPOFF = GND. If the

amplifier is turned off (OPOFF = VCC), V1 to V5 must be

supplied to the V1OUT to V5OUT pins.

Input pad

Outputs VCC supply level; can fix the input pads to VCC

level.

GND

Test pin. Must be fixed at GND level.

14

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