Data Sheet S14416EJ1V0DS00

4

µµµµPD16772

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 I/O 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

STHL

Left shift start pulse

input/output

These refer to the start pulse I/O pins when driver ICs are connected in cascade.

Fetching of display data starts when H is read at the rising edge of CLK.

R,/L = H (right shift): STHR input, STHL output

R,/L = L (left shift): STHL input, STHR output

The start pulse width (H level) for next-level drivers is 1CLK.

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 80th clock after the start pulse input, the

start pulse output reaches the high level, thus becoming the start pulse of the next-level

driver. If 82 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

POL21,

POL22

Data inversion input

Data inversion can invert when display data is loaded.

POL21/22 = H : Data inversion loads display data after inverting it.

POL21/22 = L : Data inversion does not invert input data.

LPC

Low power control

input

see 9. CURRENT CONSUMPTION REDUCTION FUNCTION.

Bcont

Bias control

This pin can be used to finely control the bias current inside the output amplifier.

When this fine-control function is not required, leave this pin open. For details, see

9. CURRENT CONSUMPTION REDUCTION FUNCTION.

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.

Logic power supply

2.3 to 3.6 V

Driver power supply

8.5 V

± 0.5 V

Logic ground

Grounding

Driver ground

Grounding