µPD16635

5

4.

PIN FUNCTIONS

Pin Symbol

Pin Name

Description

Driver output

Display data input

R/L

Shift direction

switching input

STHR

Right shift start

pulse input/output

STHL

Left shift start

pulse input/output

CLK

Shift clock input

STB

Latch input

POL

Polarity input

γ-corrected power

supplies

TEST

Test pin

Logic power supply

Driver power supply

Logic ground

Driver ground

2. To stabilize the supply voltage, please be sure to insert a 0.1

µF bypass capacitor between

of a bypass capacitor of about 0.01

µF is also advised between the γ-corrected power supply

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

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

6 dots (2 pixels).

These refer to the start pulse input/output pins when cascades are connected.

The shift directions of the shift registers are as follows.

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

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

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

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

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 40th clock after the

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

start pulse of the next-stage driver. The initial-stage driver’s 40th clock becomes

valid as the next-stage driver’s start pulse is input. If 42 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.

The contents of the data register are transferred to the latch 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.

rising edge.

Input the

γ-corrected power supplies from outside. 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.

Set it to “OPEN”.

3.3 V

± 0.3 V

11.0 V to 13.5 V

Grounding

Grounding