SCF5742 - OSRAM OPTO SEMICONDUCTORS

Lead (Pb) Free Product - RoHS Compliant

Standard Red SCF5740

Super-red SCF5742

High Efficiency Green SCF5744

0.270’’ 4-Character 5x7 Dot Matrix

Serial Input, Dot Addressable Intelligent Display® Devices

2006-01-23 1

DESCRIPTION

The SCF574X is a four digit, dot add ressable 5 x 7 dot

matrix, serial in put, a lphanumeric Intelligent Display

device. The four digits are packaged in a r ugged, high

quality, optically transparent, plastic 22 pin DIP with

2.54 mm (0.1") pin spacing.

The on-board CMOS has a 140 bit RAM, one bit associ-

ated with one LED, each to generate User Defined Char-

acters. In Power Down Mode, quiescent current

is < 50 µA.

The SCF574X is designed for work with the serial port of

most common microprocessors. Data is transferred into

the displa y throu gh the Serial Data Input ( DATA), cloc k ed

by the Serial Data Clock (SDCLK), and enabled by the

Load Input (LOAD).

The Cloc k I /O (CLK I/ O) a nd Cl oc k S elect (CLK SEL) pi ns

offer the user the capability to supply a high speed

external multiplex clock. This feature can minimize audio

in-band interference for portable communication

equipment or eliminate the visual sychronization effects

found in high vibration environments such as avionic

equipment.

FEATURES

• Four 6.86 mm (0.270") 5 x 7 Dot Matrix Characters in

Red, Super-red, High Ef ficiency Green

• Optimum Display Surface Efficiency

(display area to package ratio)

• High Speed Data Input Rate: 5.0 MHz

• ROMless Serial Input, Dot Addressable Display

Ideal for User Defined Characters

• Built-in Decoders, Multiplexers and LED Drivers

• Readable from 1.8 meters (6 Feet)

• Wide Viewing Angle, X Axis ± 55°, Y Axis ± 55°

• Attributes:

– 140 Bit RAM fo r User Defined Characters

– Eight Dimming Levels

– Power Down Model (< 250 µW)

– Hardware/Software Clear Functions

– Internal or External Clock

2006-01-23 2

SCF5740, SCF5742, SCF5744

Package Outlines Dimensions in mm (inch)

Ordering Information

Type Color of Emission Character Height

mm (inch) Ordering Code

SCF5740 standard red 6.86 (0.270) Q68000A8848

SCF5742 super-red Q68000A8901

SCF5744 high efficiency green Q68000A8903

IDOD5213

20.07 (0.790)

±0.25 (0.010)

3.99 (0.157)

8.26 (0.325)

±0.18 (0.007)

4.45 (0.175)

33.02 (1.300) max.

6.86 (0.270)

7 (0.276) max.

15.25 (0.600)

±0.51 (0.020)

0.46 (0.018) x 0.3 (0.012)

Leads 22 plcs.

3.68 (0.145)

±0.38 (0.015)

2.54 (0.100)

±0.38 (0.015)

4.06 (0.160)

±0.51 (0.020)

OSRAM

SCF574X Z YYWW V

Luminous

Intensity Code

EIA Date Code

Pin 1

Indicator

SCF5740, SCF5742, SCF5744

2006-01-23 3

Maximum Ratings

Parameter Symbol Value Unit

Operating temperatur e range Top – 40 … + 85 °C

Storage temperature range Tstg – 40 … + 100 °C

DC Supply Voltage VCC -0.5 to + 7.0 V

Input Voltage Levels Relative to GND -0.5 to VCC +0.5 V

Solder Temperature

1.59 mm (0.063“) below seating plane, t < 5.0 s TS260 °C

Relative Humidity 85 %

ESD (100 pF, 1.5 kΩ) VZ2.0 kV

Input Current ± 186 mA

Maximum Number of LEDs on at 100% Brightness 64

Power Dissipation 0.65 W

Optical Characteristics at 25°C

(VCC=5.0 V at 100% brightness level, viewing angle: X axis ± 55°, Y axis ± 65°)

Description Symbol Values Unit

Red

SCF5740

Super-red

SCF5742

High

Efficiency

Green

SCF5744

Luminous Intensity (min.)

IV55 110 110 µcd/dot

µcd/dot

Peak Wavelength (typ.) λpeak 655 630 568 nm

Dominant Wavelength (typ.) λdom 639 626 574 nm

Notes:

1. Dot to dot intensity matching at 100% brightness is 1.8:1.

2. Displays within a given inte nsity category have an intensity matching of 1.5:1 (max.).

2006-01-23 4

SCF5740, SCF5742, SCF5744

Timing Diagram—Data Write Cycle

Timing Diagram—Instruction Cycle

Switching Specifications

(over operating temperature range and VCC=4.5 V to 5.5 V)

Symbol Description Min. Units Symbol Description Min. Units

TRC Reset Active Time 600 ns TDH Data Hold Time 25 ns

TLDS Load Setup Time 50 ns TWR Total Write Time 2.2 µs

TDS Data Setup Time 50 ns TBL Time Between Loads 600 ns

TSDCLK Clock Period 200 ns TLDH Load Hold Time 0ns

TSDCW Clock Width 70 ns

Note:

TSDCW is the minimum time the SDCLK may be low or high.

The SDCLK period must be a minimum of 200 ns.

SDCLK

SDCW

DATA

LOAD

LDS

TDH

LDH

LOAD

DATA

SDCLK

D0 D1 D2 D3 D4 D5 D6 D7

SCF5740, SCF5742, SCF5744

2006-01-23 5

Input/Output Circuits

Figures „Inputs“ and „Clock I/O“ show the input and output resis-

tor/diode networks used for ESD protection and to eliminate sub-

strate latch-up caused by input voltage over/under shoot.

Inputs Clock I/O

Electrical Charac teristics (over operating temperature)

Parameter Min. Typ. Max. Units Conditions

VCC 4.5 5.0 5.5 V —

ICC (Pwr Dwn Mode) 4) —50 —µAVCC=5.0 V, all inputs=0 V or VCC

ICC 4 digits

20 dots/character —150 186 mA VCC=5.0 V, “#” displayed in all 4 digits

at 100% brightness at 25°C

IIL Input current — — –10 µAVCC=5.0 V, VIN=0 (all inputs)

IIH Input current — — 10 µAVCC=VIN=5.0 V (all inputs)

VIH 3.5 — — V VCC=4.5 V to 5.5 V

VIL — — 1.5 VVCC=4.5 V to 5.5 V

IOH (CLK I/O) —–28 —mA VCC=4.5 V, VOH=2.4 V

IOL (CLK I/O) —23 —mA VCC=4.5 V, VOL=0.4 V

θJ-pin — — 32 °C/ W —

Fext External Clock Input Frequency 120 —347 kHz VCC=5.0 V, CLKSEL=0

Fosc Internal Clock Input Frequency 120 —347 kHz VCC=5.0 V, CLKSEL=1.0

Clock I/O Bus Loading — — 240 pF —

Clock Out Rise Time — — 500 ns VCC=4.5 V, VOH=2.4 V

Clock Out Fall Time — — 500 ns VCC=4.5 V, VOH=0.4 V

FM, Digit 375 768 1086 Hz —

Notes:

1) Contact OsramOS for 3.3 volt operation.

2) Unused inputs must be tied high.

3) Peak current 5/3 x ICC.

4) External oscillator must be stopped if being used to maintain an ICC < 50 µA

IDCD5021

GND

1 k

Ω

Input

IDCD5026

GND

1 k

Ω

Input/Output

SCF5740, SCF5742, SCF5744

2006-01-23 6

Top View

Dot Matrix Format

Pin Assignment

Pin Function Pin Function

1 N/C 22 N/C

2GND 21 CLKSEL

3 N/C 20 CLK I/O

4 N/C 19 RST

5 N/C 18 N/C

6 N/C 17 N/C

7 N/C 16 N/C

8 N/C 15 SCLK

9VLL 14 DATA

10 VCC 13 LOAD

11 N/C 12 N/C

IDPA5118

Digit 0 Digit 1 Digit 3Digit 2

Pins111

22 12Pins

Tolerance: ±0.25 (0.010)

1.14 (0.045) typ.

4.45 (0.175)

0.23 (0.009) typ. 1.09 (0.043) typ.

C1 C2

IDOD5214

6.86 (0.270)

C3 C4 C5 R0

Pin Definitions

Pin Function Definitions

1 N/C —

2 GND Power supply ground

3 N/C —

4 N/C —

5 N/C —

6 N/C —

7 N/C —

8 N/C —

9VLL LED supply

10 VCC Logic supply

11 N/C —

12 N/C —

13 LOAD Low input enables data clocking into 8-bit

serial shift register. When LOAD goes high,

the contents of 8-bit serial Shift Register will

be decoded.

14 DATA Serial data inpu t

15 SDCLK For loading data into the 8-bit serial data

16 N/C —

17 N/C —

18 N/C —

19 RST Asynchronous input, when low c l ears the

Multiplex Counter, Address Register, Control

Word Register , User RAM and Data Registe r.

Control Word is set to 100% brightness. The

display will be blank.

20 CLK I/O Ou tputs master clock or inpu ts external clock.

21 CLKSEL H=internal clock (Master),

L=external clock (Slave)

22 N/C —

Display Column and Row Format

C0 C1 C2 C3 C4

Row 0 11111

Row 1 00100

Row 2 00100

Row 3 00100

Row 4 00100

Row 5 00100

SCF5740, SCF5742, SCF5744

2006-01-23 7

Operation of the SCF574X

The SCF574X di sp lay consists of CMOS IC con ta in ing control logic

and drivers for four 5 x 7 characte rs . These com pon ents ar e assem -

bled in a compact plastic package.

Individual LED dot addressablity allows the user great freedom in

creating special characters or mini-icons.

The serial data inter f ace pro vides a h ighly effi cient in terconne ction

between the displa y and the mother bo ard. The SCF5 74X requir es

only 3 lines as compared to 14 for an equivalent four character par-

allel input part.

The on-board CMOS IC is the electronic heart of the display. The

IC accepts decoded serial data, which is stored in the internal RAM.

Asynchronously the RAM is read by the character multiplexer at a

strobe rate that results in a flicker free display. Figure „SCF574X

Block Diagram“ (page 7) shows the three functional areas of the IC .

These include: the input serial data register and control logic, a

140 bits two port RAM, and an internal multiplexer/display driver.

SCF574X Block Diagram

Row 6 00100

1= Display dot „ON“

0=Display dot „OFF“

Column Data Ranges

Row 0 00H to 1FH

Row 1 00H to LFH

Row 2 00H to LFH

Row 3 00H to LFH

Row 4 00H to LFH

Row 5 00H to LFH

Row 6 00H to LFH

Display Column and Row Format

C0 C1 C2 C3 C4

IDBD5073

Memory

Y Address Decode

User RAM Drivers

Digit

Column

0 to 4

7 x 20 bits

X Address Decode

3-bit Address Register

6-bit Control

Word Register

Control Word Logic

Columns 0 to 20

Display

123

and Row Drivers

Row Control Logic

Counter

764

Counter

OSC

8-bit Serial Register

Rows

0 to 6

MUX

Rate

DATA

SDCLK

LOAD

CLKSEL

CLK I/O

RST

VDIM Controls

SCF5740, SCF5742, SCF5744

2006-01-23 8

The following explains how to format the serial data to be loaded

into the display. The user supplies a string of bit mapped decoded

characters. The contents of this string is shown in Figure „Lo ad ing

Serial Character Data a“ (page 8). Figure „Loading Serial Charac-

ter Data b“ (page 8) shows that each character consist of eight

8 bit words. The first word encodes the display character location

and the succeeding seven bytes are row data. The row da ta r ep re -

sents the status (On, O ff) of indi vidu al colu mn L EDs . Fi gur e „Load -

ing Serial Characte r Data c“ (page 8) shows that e ach 8 bit word is

formatted to represent Character Address, or Column Data.

Figure „Loading Serial Character Data d“ (page 8) shows the

sequence f or loa ding the b y tes of data. Bringing the LOAD line low

enables the serial register to accept data. The shift action occurs

on the low to high transition of the serial data clock (SDCLK). The

least significant bit (D0) is loaded first. After eight clock pulses the

LOAD line is brought high. With this transition the OPCODE is

decoded. The decoded OPC OD E di rects D4–D0 to be latched in

the Character Address register, stored in the RAM as Column

data, or latched in the Control Word register. The control IC

requires a min imum 600 ns delay between successive byte loads.

As indicated in Fi gure „Lo ading Serial C har act er Dat a a“ (page 8),

a total of 256 bits of data are required to load all four characters

into the display.

The Charact er Add ress Reg ister bi ts , D4– D0 (Table „Loa d Cha ra c-

ter Address“ (page 9)), and Row Address Register bits, D7– D5

(Table „Load Column Data“ (page 9)) direct the Column Data bits,

D4–D0 (Table „L oad C olu mn D ata “ (page 9)) to specific RAM loca-

tion.

Table „Character ’D’“ (page 8) shows the Row Address for the

example character “D.” Column data is written and read asynchro-

nously from the 140 bit RAM. Once loaded the internal oscillator

and character multiplexer reads the data from the RAM. These

characters are row strobed with column data as shown in Figures

„Row and Column Location“ (page 9) and „Row Strobing“

(page 10). The character strobe rate is determined by the internal

or user supp lied external MUX Clock and the IC’s ÷320 counter.

Loading Serial Character Data

Character “D”

Op code

D7 D6 D5 Column Data

D4 D3 D2 D1 D0

C0 C1 C2 C3 C4

Hex

Row 0 000 111 1 0 1E

Row 1 000 100 0 1 11

Row 2 000 100 0 1 11

Row 3 000 100 0 1 11

Row 4 000 100 0 1 11

Row 5 000 100 0 1 11

Row 6 000 111 1 0 1E

Character 0 Character 1 Character 2 Character 3

352 Clock Cycles, 70.4 µs

Example: Serial Clock = 5.0 MHz, Clock Period = 200 ns

Time between LOADS

LOAD

Clock

Period

D0 D1 D2 D3 D4 D5 D6 D7

11 Clock Cycles, 2.2 µs

Time

Between

Loads

600 ns(min)

OPCODECharacter Address OPCODE

Column Data

D D1

D D2

D D3

D D4

11 Clock Cycles, 2.2µs

Character 0

Address Row 0 Column

Data

88 Clock Cycles, 17.6 µs

Row 1 Column

Data Row 2 Column

Data Row 3 Column

Data Row 4 Column

Data

0 D1

0 D2

0 D3

0 D4

0 D5

1 D6

0 D7

Row 5 Column

Data Row 6 Column

Data

0 D6

0 D7

Time

Between

Loads

600 ns(min)

Serial

Clock

DATA

SCF5740, SCF5742, SCF5744

2006-01-23 9

The user can activate four Control functions. These include: LED

Brightness Level, Prescaler, IC Power Down, or Display Clear.

OPCODEs and six bit words are used to initiate these functions.

The OPCODEs and Control Wo rds for the Character Address and

Loading Column Data are shown in Tables „Load Character

Address“ (page 9) and „Load Column Data“ (page 9).

The user can select eight specific LED brightness levels, Ta bles

„Display Brightness“ (page 9). Depending on how D3 is selected

either one (1) for maximum peak current or zero (0) for 12.5% of

maximum peak current in the cont rol word per Ta bles „Display

Brightness“ (page 9), the user can select 16 specific LED bright-

ness levels. These brightness levels (in percentages of full bright-

ness of the display) include: 100% (E0 HEX or E8 HEX), 53% (E1HEX

or E9 HEX), 40% (E2HEX or EA HEX), 27% (E3HEX or EB HEX), 20%

(E4HEX or EC HEX), 13% (E5HEX or ED HEX), and 6.6% (E6HEX or

EE HEX), 0.0% (E7 HEX or EF HEX). The brightness levels are con-

trolled by changing the duty factor of the row strobe pulse.

Row and Column Location

The SCF574X offers a unique Display Power Down feature which

reduces ICC to less than 50 µA. When EFHEX is loaded, as shown in

Table „Power Down“ (page 9), the display is set to 0% brightness

and the internal multiplex clock is stopped. When in the Power

Down mode data may still be written into the RAM. The display is

reactivated by loading a new Brightness Level Control Word into

the display.

Load Character Address

Op code

D7 D6 D5 Character Address

D4 D3 D2 D1 D0 Hex Operation

Load

101 00 0 0 0 A0 Character 0

101 00 0 0 1 A1 Character 1

101 00 0 1 0 A2 Character 2

101 00 0 1 1 A3 Character 3

Load Column Data

Op code

D7 D6 D5 Column Data

D4 D3 D2 D1 D0 Operation Load

000 C0 C1 C2 C3 C4 Row 0

000 C0 C1 C2 C3 C4 Row 1

000 C0 C1 C2 C3 C4 Row 2

000 C0 C1 C2 C3 C4 Row 3

000 C0 C1 C2 C3 C4 Row 4

000 C0 C1 C2 C3 C4 Row 5

000 C0 C1 C2 C3 C4 Row 6

IDXX5189

Row 2

Row 3

Row 4

Row 5

Row 6 01234

On LED

Off LED

Columns

Row 0

Row 1

Previously "on" LED

Display Brightness

Op code

D7 D6 D5 Control Word

D4 D3 D2 D1 D0 Hex Operation

Level

111 00 0 0 0 E0 100%

111 00 0 0 1 E1 53%

111 00 0 1 0 E2 40%

111 00 0 1 1 E3 27%

111 00 1 0 0 E4 20%

111 00 1 0 1 E5 13%

111 00 1 1 0 E6 6.6%

111 00 1 1 0 E7 0.0%

Display Brightness

Op code

D7 D6 D5 Control Word

D4 D3 D2 D1 D0 Hex Operation

Level

111 01 0 0 0 E8 100%

111 01 0 0 1 E9 53%

111 01 0 1 0 EA 40%

111 01 0 1 1 EB 27%

111 01 1 0 0 EC 20%

111 01 1 0 1 ED 13%

111 01 1 1 0 EE 6.6%

111 11 1 1 0 EF 0.0%

Power Down

Op code

D7 D6 D5 Control Word

D4 D3 D2 D1 D0 Hex Operation

Level

111 11 1 1 1 EF 0%

brightness

SCF5740, SCF5742, SCF5744

2006-01-23 10

Row Strobing

The SCF574X allows a high frequency external oscillator source

to drive the display. Data bit, D4, in the control word format con-

trols the prescaler function. The prescaler allows the oscillator

source to be divided by 16 by setting D4=1. However, the pres-

caler should not be used, i.e., when using the internal oscillator

source.

The Software Clear (C0HEX), given in Table „Software Clear“

(page 10), clears the Address Register and the RAM. The di splay

is blanked and the Character Address Register will be set to Char-

acter 0. The internal counter and the Control Word Register are

unaffected. The Software Clear will remain active until the next

data input cycle is initiated.

Multiplexer and Displ ay Driver

The four characters are row multiplexed with RAM resident column

data. The strobe rate is established by the internal or external

MUX Clock rate. The MUX Clock frequency is divided by a 448

counter chain. This results in a typical strobe rate of 768 Hz. By

pulling the Cl ock SEL l ine low, the displa y can be op erated from an

external MUX Cloc k. The exte rnal cloc k is a tta che d to the CL K I /O

connection (pin 9). The maximum external MUX Clock frequency

should be limited to 1.0 MHz.

An asynchronous hardware Reset is also provided. Bringing this

pin low will clear the Character Address Register, Control Word

play set at Character Address 0, and the Brightness Level set at

100%.

Electrical & Mechanical Considerations

Thermal Considerations

Optimum product performance can be had when the following

electrical and mechanical recommendations are adopted. The

SCF574X’s IC is constructed in a high speed CMOS process, con-

sequently high speed noise on the SERIAL DATA, SERIAL DATA

CLOCK, LOAD and RESET lines may cause incorrect data to be

written into the serial shift register. Adhere to transmission line ter-

mination procedures when using fast line drivers and long cables

(< 10 cm).

When the internal MUX Clock is being used connect the CLKSEL

pin to VCC. In those applications where RESET will not be con-

nected to the system’s reset control, it is recommended that this

pin be connected t o the cent er node of a series 0.1 µ F and 1 00 kΩ

RC network. Thus upon initial power up the RESET will be held

low for 10 ms allowing adequate time for the system power supply

to stabilize.

ESD Protection

The input protection structure of the SCF57 4X provides significant

protection ag ainst ESD damage. It is capable of withstanding dis-

charges greater than 2.0 kV. Take all the standard precautions,

normal for CMOS components. These include properly grounding

personnel, tools, tables, and transport carriers that come in contact

with unshielded par ts. If these conditions are not, or cannot be

met, keep the leads of the device shorted together or the parts in

anti-static packaging.

Soldering Considerations

The SCF574X can be hand soldered with SN63 solder using a

grounded iron set to 260°C.

Wave soldering is also possible following these conditions: Pre-

heat that does n ot e xceed 9 3°C on the so lder side o f the PC board

or a package surface temperature of 85°C. Water soluble organic

acid flux (except carboxylic acid) or rosin-based RMA flux without

alcohol can be used.

Wave tem perature of 245°C ± 5°C with a dwe ll between 1.5 sec. to

3.0 sec. Exposure to the wave shoul d no t exceed temperatures

abov e 2 60°C for five seconds at 1.59 mm (0.063") below the sea t-

ing plane. Th e packages should not b e im m ersed in th e wave.

Columns

1234

Load

Row Load Row 0

Columns

01234 Columns

01234

Load Row 1 Load Row 2 Load Row 5

ColumnsColumns

01234 0

Columns

1234 01

Load Row 4Load Row 3

Columns

IDXX5190

234 01234

Load Row 6

Software Clear

Op code

D7 D6 Control Word

D5 D4 D3 D2 D1 D0 Hex Operation

Level

11 00 0 0 0 0 C0 CLEAR

SCF5740, SCF5742, SCF5744

2006-01-23 11

Po st Solder Cl eaning Procedures

The least offensive cleaning solution is hot D.I. water (60 °C) for

less than 15 min utes. Add ition of mild saponifiers is acceptable. Do

not use commercial dishwasher det ergents.

For faster cleaning, solvents may be used. Exercise care in choos-

ing solvents as some may chemically attack the nylon package. For

further information refer to Appnotes 18 an d 19 at

www.osram-os.com

An alternative to soldering and cleaning the display modules is to

use sockets. Naturally, 14 pin DIP sockets 7.62 mm (0.300") wide

with 2.54 mm (0.100") centers work well for single displays. Multi-

ple display assemblies are best handled by longer SIP sockets or

DIP sock ets wh en av aila ble f or unif orm packag e alignmen t. Soc ket

manufacturers are Aries Electronics, Inc., Frenchtown, NJ; Garry

Manufacturing, New Brunswick, NJ; Robinson-Nugent, New

Albany, IN; and Samtec Electronic Hardward, New Albany, IN.

For further information refer to Appnote 22 at www .osram-os.com

Optical Considerations

The 6.86 mm (0.270") high character of the SCF574X gives read-

ability up to five feet. Proper filter selection enhances readability

over this distance.

Using filters emphasizes the contrast ratio between a lit LED and

the character background. This will increase the discriminati on of

different characters. The only limitation is cost. Take into consider-

ation the ambient lighting environment for the best cost/benefit

ratio for filters .

Incandescent (with almost no green) or fluorescent (with almost no

red) lights do not have the flat spectral response of sunlight. Plas-

tic band-pass filters are an inexpensive and effective way to

strengthen contrast ratios. The SCF5740 is a red display and

should be used with long wavelength pass filter having a sharp

cut-off in the 600 nm to 620 nm range. The SCF5742 is a

super-red display and should be used with long wavelength pass

filter having a sharp cut-off in the 570 nm to 600 nm range. The

SCF5744 is a high efficiency green display and should be used

with long wavelength pass filter that peaks at 565 nm.

Additional contrast enhancement is gained by shading the dis-

plays. Plastic band-pass filters with built-in louvers offer the next

step up in contrast improvement. Plastic filters can be improved

further with anti-refle ctive coatings to re duce glare . The trad e-off is

fuzzy characters. Mounting the filters close to the display reduces

this effect. Take care not to ov erheat the plastic filter by allo wing for

proper air flow.

Optimal filter enhancements are gained by using circular polarized,

anti-reflective, band-pass filters. The circular polarizing further

enhances contrast by reducing the light that travels through the fil-

ter and reflects back off the display to less than 1%.

Several filter manufacturers supply quality filter materials. Some of

them are: Panelgraphic Corporation, W. Caldwell, NJ; SGL Homa-

lite, Wilmington, DE; 3M Company, Visual Products Division, St.

Paul, MN; Polaroid Corporation, Polarizer Division, Cambridge,

MA; Marks Polarized Corporation, Deer Park, NY, Hoya Optics,

Inc., Fremont, CA.

One last note on mounting filters: recessing displays and bezel

assemblies is an inexpensive way to provide a shading effect in

overhead lighting situations. Several Bezel manufacturers are:

R.M.F. Products, Batavia, IL; Nobex Components, Griffith Plastic

Corp., Burlingame, CA; Photo Chemical Prod ucts of Califor nia,

Santa Monica, CA; I.E.E.–Atlas, Van Nuys, CA.

Microprocessor Interface

The microp rocessor interf a ce is t hrough the serial port, SPI port or

one out of ei ght d ata bits on th e ei ght bi t pa ra llel po rt and also con -

trol lines SDCLK and LOAD.

Power Up Sequence

Upon power up display will come on at random. Thus the display

should be reset at power-up. The reset will set the Address Regis-

ter to Digit 0, User RAM is set to 0 (display blank) the Control Word

is set to 0 (100% brightness with Lamp Test off) and the internal

counters are reset.

Display Interface to Siemens/Intel 8031 Microprocessor (using serial port in mode 0)

IDCD5224

XTAL2 RxD

18 10

19 XTAL1

RST

917

P3.7

P3.3

P3.4 14

8031

TxD 11 SDCLK

RST

GND CLKSEL

CLK I/O

DATA

GND

0.01 µF

TAN

22 µF

2006-01-23 12

SCF5740, SCF5742, SCF5744

Display Interface with Si emens/Intel 8031 Micropr o cessor (using one bit of parallel port as serial port)

Display Interface with Motorola 68HC05C4 Micr opro cessor (using SPI por t)

IDCD5225

XTAL2 P3.0

18 10

19 XTAL1

RST

8031

U1 SDCLK

RST

GND CLKSEL

CLK I/O

DATA

GND

0.01 µF

TAN

22 µF

P1.0

P3.1 11

P3.6 16

P0.0 39

IDCD5226

OSC1 PA0

38 11

39 OSC2

RST

68HC05C4

U1 SDCLK

RST

GND CS

CLK I/O

DATA

GND

0.01 µF

TAN

22 µF

PA2

PA1 10

SCLK 33

MOSI 32

SCF5740, SCF5742, SCF5744

2006-01-23 13

Cascading Multiple Displays

Multiple displays can be cascaded using the CLKSEL and CLK I/O pins as shown be low. The display designated as the Master Clock

source should have its CLKSEL pin tied high and the slaves should have their CLKSEL pins tied low. All CLK I/O pins should be tied

together. One display CLK I/O can drive 15 slave CLK I/Os. Use RST to synchronize all display counters.

Cascading Multiple Displays

Loading Data Into the Display

Use following procedure to load data into the display:

1. Power up the display.

2. Bring RST low (600 ns duration minimum) to clear the Multiplex Counter, Address Register, Control Word Register,

User Ram and Data Register. The display will be blank. Display brightness is set to 100%.

3. If a different brightness is desired, load the proper brightness opcode into the Control Word Register.

4. Load the Digit Address into the display.

5. Load display row and column data for the selected digit.

6. Repeat steps 4 and 5 for all digits.

IDCD5030

RST CLK SEL

Intelligent Display

DATA SDCLK LOAD

14 more displays

in between

DATA

SDCLK

Decoder

Address Address Decode 1-14

RST

CLK I/O

Intelligent Display

DATA

RST

SDCLK

CLK I/O

LOAD

CLK SEL

Chip

LD CE

2006-01-23 14

SCF5740, SCF5742, SCF5744

Data Contents for the Word “ABCD”

Step D7 D6 D5 D4 D3 D2 D1 D0 Function

B (optional) 1 1 0

1 1 1 00 0 0 0

00 0 0 0 CLEAR

100% BRIGHTNESS

10 1

00 0

0 0 0

00 0 0 0

00100

01 0 1 0

10 0 0 1

11 1 1 1

10001

10 0 0 1

DIGIT D0 SELECT

ROW 0 (A)

ROW 1 (A)

ROW 2 (A)

ROW 3 (A)

ROW 4 (A)

ROW 5 (A)

ROW 6 (A)

1 0 1

00 0

0 0 0

00001

11111

10001

10 0 0 1

11 1 1 0

10 0 0 1

11 1 1 1

DIGIT D1 SELECT

ROW 0 (B)

ROW 1 (B)

ROW 2 (B)

ROW 3 (B)

ROW 4 (B)

ROW 5 (B)

ROW 6 (B)

1 0 1

0 0 0

00 0 1 0

00111

01000

10 0 0 0

10000

01 0 0 0

00 1 1 1

DIGIT D2 SELECT

ROW 0 (C)

ROW 1 (C)

ROW 2 (C)

ROW 3 (C)

ROW 4 (C)

ROW 5 (C)

ROW 6 (C)

1 0 1

0 0 0

00011

11 1 1 0

10 0 0 1

10001

10 0 0 1

10001

11110

DIGIT D3 SELECT

ROW 0 (D)

ROW 1 (D)

ROW 2 (D)

ROW 3 (D)

ROW 4 (D)

ROW 5 (D)

ROW 6 (D)

SCF5740, SCF5742, SCF5744

2006-01-23 15

Published by

OSRAM Opto Semiconductors GmbH

Wernerwerkstrasse 2, D-93049 Regensburg

www.osram-os.com

Attention please!

The information describes the type of component and shall not be considered as assured characteristics.

Terms of delivery and rights to change design reserved. Due to technical requirements components may contain

dangerous substances. For information on the types in question please contact our Sales Organization .

If printed or downloaded, please find the latest version in the Internet.

Packing

Please use the recycling operators known to you. We can also help you – get in touch with your nearest sales office.

By agreement we will take packing material back, if it is sorted. You must bear the costs of transport. For packing

material that is retu rned to us unsorted or which we are not obliged to a ccept, we shall have t o invoice you for any costs

incurred.

Components used in life-support devices or systems must be expressly authorized for such purpose! Critical

components1) may only be used in life-support devices or systems2) with the express writte n approval of OSRAM OS.

1) A critical component is a component used in a life-support device or system whose failure can reasonably be expected to cause the

failure of that life-support device or system, or to affect its safety or the effectiveness of that device or system.

2) Life support devices or systems are intended (a) to be implanted in the human body, or (b) to support and/or maintain and sustain

human life. If they fail, it is reasonable to assume that the health and the life of the user may be endangered.

Revision History: 2006-01-23

Previous Version: 2005-01-10

Page Subjects (major changes since last revision) Date of change

all Lead free device 2006-01-23