Applying the DLX1414
Intelligent Display
®
Products
Appnote 15
This application note is intended to serve as a design and appli-
cation guide for users of the DLX1414 alphanumeric Intelligent
Display. The information presented covers device electrical
description and operation, considerations for general circuit
design, and interfacing the DLX1414 to microprocessors.
Electrical & Mechanical Description
The internal electronics of the Intelligent Display eliminates all
the traditional difficulties of using multi-digit light emitting dis-
plays (decoding, drivers and multiplexing). The Intelligent Dis-
Figure 1. Block Diagram–DLX1414
D i spl a y
Rows 0 to 6
3
R o w C o n t r o l Log i c
& Ro w Dri v ers
2
1
0
Columns 0 to 19
play also provides internal memory for the four digits. With this
approach the user can asynchronously address one of four dig-
its and load new data without regard to the LED multiplex tim-
ing.
Figure 1 is a block diagram of the DLX1414. The device con-
sists of four (5x7) LED arrays and a single CMOS integrated
chip. The IC chip contains the column drivers 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.
OSC
÷128
Counter
÷7
Counter
Ti mi n g a nd Co ntro l L ogi c
Row D eco der
Column Decoder
ROM
12 8x 35 Bi t
ASCII
C ha rac te r
D e code
4 48 0 Bi ts
Column D ata
D isplay
O utput
Logic
D6
D5
D4
D3
D2
D1
D0
7 B i t ASCII Code
RAM
M em or y
4x 7 Bi t
WR
A0
A1
W ri t e
A ddr ess
De co der
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
Latches
RAM Read Logic
1
May 31, 2000-12
OSRAM [ OSRAM GMBH ]
