4

4. PIN FUNCTIONS

Pin Symbol

Pin Name

Description

Driver output

The D/A converted 64-gray-scale analog voltage is output.

Display data input

The display data is input with a width of 36 bits, viz., the gray scale data (6 bits)

by 6 dots (2 pixels).

R/L

Shift direction control

input

These refer to the start pulse input/output pins when driver ICs are connected in

cascade. The shift directions of the shift registers are as follows.

STHR

Right shift start pulse

input/output

R/L = H : Becomes the start pulse input pin.

R/L = L : Becomes the start pulse output pin.

STHL

Left shift start pulse

input/output

R/L = H : Becomes the start pulse output pin.

R/L = L : Becomes the start pulse input pin.

CLK

Shift clock input

Refers to the shift register’s shift clock input. The display data is incorporated into

the data register at the rising edge. At the rising edge of the 52nd clock after the

start pulse input, the start pulse output reaches the high level, thus becoming the

start pulse of the next-level driver. The initial-level driver’s 52nd clock becomes

valid as the next-level driver’s start pulse is input. If 54th clock pulses are input

after input of the start pulse, input of display data is halted automatically. The

contents of the shift register are cleared at the STB’s rising edge.

STB

Latch input

The contents of the data register are transferred to the latch circuit at the rising

edge. And, at the falling edge, the gray scale voltage is supplied to the driver. It

is necessary to ensure input of one pulse per horizontal period.

POL

Polarity input

POL2

Data inversion

POL2 = H : Display data is inverted.

POL2 = L : Display data is not inverted.

γ-corrected power

supplies

Input the

γ-corrected power supplies from outside by using operational amplifier.

Make sure to maintain the following relationships. During the gray scale voltage

output, be sure to keep the gray scale level power supply at a constant level.

TEST

Test pin

TEST = H or Open: Standard mode

TEST = L: Test mode

Please input “H” level.

Logic power supply

3.3 V

± 0.3 V

Driver power supply

10.0 V to 13.5 V

Logic ground

Grounding

Driver ground

Grounding