PD3535(2006) データシートの表示（PDF） - OSRAM GmbH

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PD3535
(Rev.:2006)

4-Character 5 x 7 Dot Matrix Alphanumeric Programmable DisplayTM with Built-in CMOS Control Functions

OSRAM GmbH 

PD243X, PD353X, PD443X

D7 D6 D5 D4 D3 D2 D1 D0 Operation

0 0 0 0 X X B B Disable high-

light attribute

0 0 0 1 0 0 B B Display cursor*

instead of

character

0 0 0 1 0 1 B B Blink single

character

0 0 0 1 1 0 B B Display blink-

ing cursor*

instead of char-

acter

0 0 0 1 1 1 B B Alternate char-

acter with cur-

sor*

*“Cursor”= all dots in a single character space lit to half brightness

X = Don't care

B=Depends on the selected brightness.

Attributes are non-destructive. If a character with bit D7 set is

replaced by a cursor (Control Word bit D4 is set, and D3=D2=0)

the character will remain in memory and can be revealed again by

clearing D4 in the Control Word.

Blink (D5): The entire display can be caused to blink at a rate of

approximately 2.0 Hz by setting bit D5 in the Control Word. This blink-

ing is independent of the state of D7 in all character locations.

To synchronize the blink rate in a bank of these devices, it is nec-

essary to tie all devices' clocks and resets together as described in

a later section of this data sheet.

D7 D6 D5 D4 D3 D2 D1 D0 Operation

0 0 1 X X X B B Blinking display

Lamp Test (D6): When the Lamp Test bit is set, all dots in the

entire display are lit at half brightness. When this bit is cleared, the

display returns to the characters that were showing before the

lamp test.

D7 D6 D5 D4 D3 D2 D1 D0 Operation

0 1 0 X X X X X Lamp test

Clear Data (D7): When D7 is set (D7=1) in the Control Word, all (dis-

play) memory bits are reset to zero and the display goes blank.

D7 D6 D5 D4 D3 D2 D1 D0 Operation

1 0 X X X X X X Clear

A second control word must be written into the chip with D7 reset

(D7=0) to set up attributes and brightness levels.

The SMC-4740 oscillator is designed to drive up to 16 displays

with input loading of 15 pF each.

The general requirements for cascading 16 displays are:

1.Determine the correct address for each display.

2.Tie CE0 to ground and use CE1 from an address.

3.Select one of the displays to provide the clock for the

other displays.

4.Tie CLKSEL to ground on other displays.

5.Use RST to synchronize the blinking between the displays.

Cascading Diagram

RST

RD

WR

VCC

WR RD RST CLK CLK

I/O SEL

Programmable Display

D0-D7 A0-A2 CE0 CE1

Data I/O

Address

14 more displays

in between

WR RD RST CLK CLK

I/O SEL

Programmable Display

D0-D7 A0-A2 CE0 CE1

A4

A5

Address

Decoder

A6

Address Decode Chip 1 to 14

2006-01-23

10

IDCD5032

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