 2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA

www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)

OSRAM Opto Semiconductors GmbH & Co. OHG • Regensburg, Germany

www.osram-os.com • +49-941-202-7178

1

May 31, 2000-12

An Intelligent Display also provides internal memory for the

four digits. This approach allows the user to asynchronously

address one of four digits, and load new data without regard to

the LED multiplex timing.

Figure 1 is a block diagram of the DLX3416. The unit consists

of four (5x7) LED arrays and a single CMOS integrated chip.

The IC chip contains the column and row drivers, 128 character

ROM, four word x7 bit Random Access Memory, oscillator for

multiplexing, multiplex counter/decoder, cursor memory,

address decoder, and miscellaneous control logic.

This application note is intended to serve as a design and appli-

cation guide for users of the DLX3416 (referred to as 3416

hereafter) alphanumeric Intelligent Displays. This appnote also

covers device electrical description and operation, consider-

ations for general circuit design, and interfacing the 3416 to

microprocessors. Refer to the specific data sheet and other

Infineon / OSRAM Appnotes for more details.

Electrical & Mechanical Description

The internal electronics in these Intelligent Displays eliminates

all the traditional difficulties of using multi-digit light emitting

displays (segment decoding, drivers, and multiplexing).

Figure 1. Block diagram—DLX3416

Rows 0 to 6

Display

Columns 0 to 19

Display

Output

Logic

Cue

Ro w Co ntro l Lo g i c

& Row Drivers

Row Decoder

ROM

128x35 Bit

ASCII

Character

Decode

4480 Bits

D6

D5

D4

D3

D2

D1

D0

Write

Address

Decoder

RAM

Memory

Timing and Control Logic

Cursor Memory Bits 0 to 3

Address Lines

4x7 Bit

OSC

÷128

Counter

÷7

Counter

Cursor

Memory

4x1 Bit

7 Bit ASCII Code

RAM Read Logic

Column Data

WR

A0

A1

CE1

CE2

CE3

CE4

CU

BL

3

2

1

0

Applying the DLX3416*

Appnote 17