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YELLOW

SCDQ5541P/Q/R

HIGH EFFICIENCY RED

SCDQ5542P/Q/R

GREEN

SCDQ5543P/Q/R

HIGH EFFICIENCY GREEN

SCDQ5544P/Q/R

Square 0.134" 4-Character

5x5 Dot Matrix Serial Input Dot Addressable

Intelligent Display

Devices

Typical Package Outline & Matrix

SCDQ554XP SIP Package

SCDQ554XQ 90

° SIP Package

SCDQ554XR 90

° Connector/Header Package

0.112 (2.83)

0.400 (10.16)

0.200 (5.08)

0.784 (19.91)

0.134 (3.40)

0.187 (4.75)

0.134 (3.40)

0.235 (5.96)
±.010 (±.25)

0.475 (12.07) Max.
±.445 (±11.30) Typ.

0.079 (2.00)
±.010 (±.25)

0.235 (5.96)
±.015 (±.38)

0.050 (1.27)

0.160 (4.06)

0.365 (9.27) Max.
0.345 (8.76) Typ.

0.393 (9.98)

±.015 (±.40)

.012 x .018 (.30 x .46)
±.002 (±.05) Pin

0.079 (2.00)

±.010 (±.25)

Tolerance-Non Cum.

0.200 (5.08)

0.065 (1.65)
±.015 (±.38)

1. Par t marking is on this side of the display.

2. Mole x header, 53290-0510 mounted on the display.

3. Mole x receptacle, 52418-0510 mounted on the customer's PCB. Supplied by the customer.

Use Pin 1 designation on this drawing, not the Molex connector specification.

4. Unless otherwise specified all tolerances are

±.010 (±.25)

Pin 1

0.157 (4.00)

2000 Infineon Technologies Corp. · Optoelectronics Division · San Jose, CA

SCDQ5541/5542/5543/5544/P/Q/R

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FEATURES

· Four 0.134" (3.40 mm) 5x5 Dot Matrix Characters in Yel-

low, High Efficiency Red, Green, or High Efficiency Green

· Optimum Display Surface Efficiency

(display area to package ratio)

· Square Character Format to Display Data in a

Vertical or Horizontal Format

· 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 6 Feet (1.8 meters)

· Wide Viewing Angle, ±55

in X-Axis and Y-Axis

· Attributes:

100 Bit RAM for User Defined Characters
Eight Dimming Levels
Power Down Model (<250

Software Clear Function
Lamp Test
3.3 V Capability

DESCRIPTION

The SCDQ5541X (Yellow), SCDQ5542X (High Efficiency Red),
SCDQ5543X (Green), and SCDQ5544X (High Efficiency Green)
are four digit, dot addressable 5x5 dot matrix, serial input,
alphanumeric Intelligent Display devices in a square format.
The four digits are packaged in a rugged, high quality, optically
transparent, plastic package several mounting options. The SIP
Pin for standard display mounting and 90

Bend SIP for side

mounting. Additionally, a connector/header configuration is also
available for display side mounting.

The on-board CMOS has a 100 bit RAM, one bit associated
with one LED, each to generate User Defined Characters. In
Power Down Mode, quiescent current is <50

The SCDQ554XX is designed for work with the serial port of
most common microprocessors. Data is transferred into the
display through the Serial Data Input (DATA), clocked by the
Serial Data Clock (SDCLK), and enabled by the Load Input
(LOAD).

Absolute Maximum Ratings

Operation in excess of any of these conditions may result in
permanent damage to this device (

=25

C).

Supply Voltage

to Gnd (non-operating) ............ 0.5 to 7.0 V

Input Voltage, Any Pin to Gnd...................... 0.5 to

to 5.5 V

Operating Temperature Range .............................40

C to 85

Storage Temperature (

) ...................................40

C to 100

Relative Humidity (non-condensing) .................................... 85

Maximum Solder Temperature, Connector Only

0.063" below Seating Plane T

5 s................................ 260

Maximum Power Dissipation ............................. 0.65 W at 85

ESD (100 pF, 1.5 k

) ........................................................ 2.0 kV

Maximum Input Current ..............................................

100 mA

Electrical characteristics

(over operating temperature, un-

less otherwise specified,

=25

Notes:

is an average value, the Peak current is

Contact manufacturer for 3.3 volt operation.

Parameter

Min.

Typ.

Max.

Units

Conditions

4.5

5.5

(Pwr. Dwn. Mode)

5.0

=5.0 V, all inputs=0 V or

(16 dots on per digit)

(1)

100

145

=5.0 V, "#" displayed in all 4 digits

at 100% brightness at 25

3.5

=4.5 V to 5.5 V

1.5

=4.5 V to 5.5 V

IN=

5.0 V (all inputs)

=5.0 V,

=0 V (all inputs)

Internal Mux Frequency

375

768

1086

C/W

Input Circuit

The input resistor/diode network shown below is used for ESD
protection and to eliminate substrate latch-up caused by input
voltage over/under shoot.

Figure 1. Inputs

1.0 k

GND

input

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SCDQ5541/5542/5543/5544/P/Q/R

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Figure 2.

Close Up of Data "Write" Cycle

Figure 3. Device Timing

Write Cycle Timing

(over operating temperature range,

=4.5 V to 5.5 V)

Notes:

1. T

=Setup Time + 8 Clock Times + Hold Times + Time Between Writes.

2. Data is shifted into the display's 8 bit shift register on the positive going edge of

the SDClk.

3. Shift register data is evaluated when Load\ goes high.

Symbol

Description

Min.

Max.

Units

LDS

Load Setup Time

Data Setup Time

SDCLK

Clock Period

200

SDCW

(HI or LOW)

Clock Width

LDH

Load Hold Time

Data Hold Time

Total Write Time

2.25

Time Between Writes

600

RST

Reset Active Time

600

SDCLK

SDCW

DATA

LOAD

LDS

TDH

LDH

LOAD

DATA

SDCLK

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Optical Characteristics at 25

(

=5.0 V at 100% brightness level, viewing angle: X axis

55°, Y axis

65°)

Yellow SCDQ5541X

High Efficiency Red SCDQ5542X

Green SCDQ5543X

High Efficiency Green SCDQ5544X

Notes:

1. Dot to dot intensity matching at 100% brightness is 1.8:1.
2. Displays are binned for hue at 2.0 nm intervals.
3. Displays within a given intensity category have an intensity match-

ing of 1.5:1 (max.).

Pinout and Pin Definitions

Description

Symbol

Min.

Typ.

Units

Luminous Intensity
Character Average (# displayed all digits)

1.8

5.4

mcd

Peak Wavelength

peak

583

Dominant Wavelength

dom

585

Description

Symbol

Min.

Typ.

Units

Luminous Intensity
Character Average (# displayed all digits)

1.8

5.4

mcd

Peak Wavelength

peak

630

Dominant Wavelength

dom

620

Description

Symbol

Min.

Typ.

Units

Luminous Intensity
Character Average (# displayed all digits)

1.8

5.4

mcd

Peak Wavelength

peak

565

Dominant Wavelength

dom

570

Description

Symbol

Min.

Typ.

Units

Luminous Intensity
Character Average (# displayed all digits)

2.1

6.4

mcd

Peak Wavelength

peak

568

Dominant Wavelength

dom

574

Pin

Function

Definitions

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.

SDATA

Serial data input

SDCLK

Loads data into the 8-bit serial data
register on a low to high transition

Power supply

GND

Power supply ground

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Figure 4. Dot Matrix Format

Figure 5. Character Address, Row, & Column Data Map

1. Viewed from the LED side of the display with the display in a hori-

zontal position.

2. The row address and column data are typical for all character positions.

The LED is on when the data bit = 1 and off when the data bit = 0.

Figure 6. Suggested Display Mounting

Operation of the SCDQ554XX

The SCDQ554XX display consists of a CMOS IC containing
control logic and drivers for four 5x5 characters. These compo-
nents are assembled in a compact plastic package.

Individual LED dot addressablity allows the user great freedom
in creating special characters or mini-icons. The User Definable
Character Set examples illustrate 200 different character and
symbol possibilities. Each example has the hexadecimal code
required to display characters in a horizontal or vertical format.
See Figure 6., Suggested Display Mounting for the display posi-
tioning. Generally, the contacts should be on the right side of
the display for the vertical format and on the top of the display
for the horizontal format.

SIP Package

90º SIP Connector/Header Packages

0.031
(0.79)

0.134
(3.40)

Char

Pins/Connector located
at the top of the display.

Col4(D4)
Col3(D3)
Col2(D2)
Col1(D1)
Col0(D0)

Rw0
Rw1
Rw2
Rw3
Rw4

PCB

Pins/Connector located
at the top of the display

Pins/Connector
located at the top
of the display

PCB

The serial data interface provides a highly efficient interconnec-
tion between the display and the mother board. The
SCDQ554XX requires only three input lines as compared to 15
for an equivalent four character parallel 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 inter-
nal RAM. Asynchronously the RAM is read by the character
multiplexer at a strobe rate that results in a flicker free display.
Figure 7. shows the three functional areas of the IC. These
include: the input serial data register and control logic, a 100
bits two port RAM, and an internal multiplexer/display driver.

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Figure 7. SCDQ Block Diagram

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 8.A. Figure 8.B shows that each character consists of six 8 bit words. The
first word encodes the display character location and the succeeding five bytes are row data. The row data represents the status
(On, Off) of individual column LEDs. Figure 8.C shows that each 8 bit word is formatted to include a three bit Operational Code
(OPCODE) defined by bits D7D5 and five bits (D4D0) representing Column Data, Character Address, or Control Word Data.

Figure 8.D shows the sequence for loading the bytes 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 OPCODE directs
D4D0 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 minimum 600 ns delay between successive byte loads.

Figure 8. Loading Serial Character Data

SD CLK

SDATA

LOAD

Counter Chain
& Timing

Oscillator

Row Decoder
& Driver

4 - 5x5

Characters

Column Logic
& Driver

Display Multiplexer

20 x 5 Bit
Dual Port Ram

LampTest

Brightness

Power Down

Ser

ial Data Register

D7 D6 D5

OPCODE

D4 D3 D2 D1 D0

ATA

OPCODE

Decoder

Softw

are

Clear

Char

acter

Address

ite

Char

acter/Ro

Address Decode

Column Output

Control

ord

Character 0

Character 1

Character 2

Character 3

LOAD

SDCLK

DATA

TBL

600 nS

Min.

TBL

600 nS

Min.

Character Address

D0
C4

TBL

D1
C3

D2
C2

D3
C1

D4
C0

Character

Address 0

Row 0

Column Data

Row 1

Column Data

Row 2

Column Data

Row 3

Column Data

Row 4

Column Data

D0
0

D1
0

D2
0

D3
0

D4
0

D5
1

D6
0

D7
1

D5
0

D6
0

D7
0

Opcode

Column Data

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The Character Address bits, D4D0 stored in the Character Address Register and the Column Data Instruction's Row Address bits,
D7D5, direct the Column Data bits, D4D0 to specific RAM location. See the Instruction Set Table for address and data format. Fig-
ure 9. shows the Row Address for the example character "D" See Figure 5., Character Address, Row, & Column Data Map for the
dot positioning (Display contacts are at the top of the display).

Column data is written and read asynchronously from the 200 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 Figure 10. The character strobe rate
is determined by the internal IC's÷320 counter.

Instruction Set

Row data is written to the character address contained in the Character Address Register.

Figure 9. Writing Character "D" Example

Row and Column Locations for a Character "D"

OPERATION

D
7

D
6

D
5

D
4

D
3

D
2

D
1

D
0

HEX

DESCRIPTION

CONTROL WORD

L
T

B
r

F0+X

Select Control Word plus operand
See Control Word Format

Power Down Mode

Power Down Mode0

% Brightness

SFT CLEAR

Software Clear

ADDRESS 1

Select Digit Address 0

Select Digit Address 1

CHR ADRS

Select Digit Address 2

Select Digit Address 3

COLUMN DATA

D
4

D
3

D
2

D
1

D
0

00+X

Row 0
D4D0=Column Data

D
4

D
3

D
2

D
1

D
0

20+X

Row 1
D4D0=Column Data

D
4

D
3

D
2

D
1

D
0

40+X

Row 2
D4D0=Column Data

D
4

D
3

D
2

D
1

D
0

60+X

Row 3
D4D0=Column Data

D
4

D
3

D
2

D
1

D
0

80+X

Row 4
D4D0=Column Data

Op code
D7 D6 D5

Column Data
D4 D3 D2 D1 D0
C0 C1 C2 C3 C4

Hex

Row 0

Row 1

Row 2

Row 3

Row 4

off LED

on LED

Row 0

Row 1

Row 2

Row 3

Row 4

0 1 2 3 4
Columns

Previously "on" LED

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Figure 10. Row Strobe Example

The user can activate four Control functions. These include:
LED Brightness Level, Lamp Test, IC Power Down, or Display
Clear. OPCODEs and five bit words are used to initiate these
functions. The OPCODEs and Control Words for the Character
Address and Loading Column Data are shown in Instruction Set
Table.

The user can select seven specific LED brightness levels.
These brightness levels (in percentages of full brightness of the
display) include: 100

% (F0HEX), 53% (F1HEX), 40% (F2HEX),

% (F3HEX), 20% (F4HEX), 13% (F5HEX), and 6.6% (F6HEX).

The brightness levels are controlled by changing the duty factor
of the row strobe pulse.

Display Brightness

The SCDQ554X offers a unique Display Power Down feature
which reduces I

to less than 50

µA. When FFHEX is loaded

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 rightness Level Control Word into the display.

Power Down

The Lamp Test is enabled by loading F8HEX into the serial shift
register. This Control Word sets all of the LEDs to a 53

% bright-

ness level. Operation of the Lamp Test has no affect on the
RAM and is cleared by loading a Brightness Control Word.

Op code
D7 D6 D5

Control Word
D4 D3 D2 D1 D0

Hex

Operation
Level

100

6.6

Op code
D7 D6 D5

Control Word
D4 D3 D2 D1 D0

Hex

Operation
Level

brightness

LOAD ROW 0

ROW LOAD

Column 0

Column 1

Column 2

Column 3

Column 4

Row 0

Row 1

Row 2

Row 3

Row 4

Row 0

Row 1

Row 2

Row 3

Row 4

Row 0

Row 1

Row 2

Row 3

Row 4

Row 0

Row 1

Row 2

Row 3

Row 4

Column 0

Column 1

Column 2

Column 3

Column 4

Column 0

Column 1

Column 2

Column 3

Column 4

Column 0

Column 1

Column 2

Column 3

Column 4

LOAD ROW 1

LOAD ROW 2

LOAD ROW 3

Row 0

Row 1

Row 2

Row 3

Row 4

OAD ROW 4

Column 0

Column 1

Column 2

Column 3

Column 4

Lamp Test

The Software Clear (C0HEX) clears the Address Register and
the RAM. The display is blanked and the Character Address
Register will be set to Character 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

Software Clear

Electrical & Mechanical Considerations

Interconnect Considerations

Optimum product performance can be had when the following
electrical and mechanical recommendations are adopted. The
SCDQ554XX's IC is constructed in a high speed CMOS pro-
cess, consequently high speed noise on the SERIAL DATA,
SERIAL DATA CLOCK, and LOAD lines may cause incorrect
data to be written into the serial shift register. Adhere to trans-
mission line termination procedures when using fast line driv-
ers and long cables (>10 cm).

Good digital grounds (pin 1) and power supply decoupling (pin
2) will insure that I

(<350 mA peak) switching currents do not

generate localized ground bounce. Therefore it is recom-
mended that each display package use a 0.1

µF and 20 µF

capacitor between V

and ground.

Op code
D7 D6 D5

Control Word
D4 D3 D2 D1 D0

Hex

Operation
Level

Lamp Test
(OFF)

Lamp Test
(ON)

Op code
D7 D6 D5

Control Word
D4 D3 D2 D1 D0

Hex

Operation
Level

CLEAR

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ESD Protection

The input protection structure of the SCDQ554XX provides sig-
nificant protection against ESD damage. It is capable of with-
standing discharges greater than 2.0 kV. Take all the standard
precautions, normal for CMOS components. These include
properly grounding personnel, tools, tables, and transport carri-
ers that come in contact with unshielded parts. If these condi-
tions are not, or cannot be met, keep the leads of the device
shorted together or the parts in anti-static packaging.

Soldering Considerations

The SCDQ554XX 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 not exceed 93

°C on the solder side of the PC

board or a package surface temperature of 85

°C. Water soluble

organic acid flux (except carboxylic acid) or resin-based RMA
flux without alcohol can be used.

Wave temperature of 245

°C ±5°C with a dwell between 1.5 s

to 3.0 s. Exposure to the wave should not exceed tempera-
tures above 260

°C for five seconds at 0.063" below the seating

plane. The packages should not be immersed in the wave.

The SCDQ554XR connects to an external connector receptacle
which may be soldered before inserting the SCDQ554XR Dis-
play. In this way, only the connector is subject to the user's sol-
dering process. The Molex 52418-0510 receptacle called out in
the product drawing can be used in solder reflow processes.
See Molex for specifications.

Post Solder Cleaning Procedures

The least offensive cleaning solution is hot D.I. water (60

°C) for

less than 15 minutes. Addition of mild saponifiers is accept-
able. Do not use commercial dishwasher detergents.

For faster cleaning, solvents may be used. Exercise care in
choosing solvents as some may chemically attack the nylon
package. For further information refer to Appnotes 18 and 19 at
www.infineon.com/opto or in the current Infineon Optoelec-
tronic Data Book. See Appnote 19, Table 2, "Displays
Group 2".

Optical Considerations

The 0.123" high character of the SCDQ554XX gives readability
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 discrimina-
tion of different characters. The only limitation is cost. Take into
consideration 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. Plastic band-pass filters are an inexpensive and effec-
tive way to strengthen contrast ratios. The SCDQ5542X is a
high efficiency red display and should be matched with long
wavelength pass filter in the 570 nm to 590 nm range. The
SCDQ5541X/3X/4X should be matched with a yellow-green
band-pass filter that peaks at 565 nm. For displays of multiple
colors, neutral density grey filters offer the best compromise.

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-reflective coatings to reduce glare.
The trade-off is fuzzy characters. Mounting the filters close to
the display reduces this effect. Take care not to overheat the
plastic filter by allowing for proper air flow.

Optimal filter enhancements are gained by using circular polar-
ized, anti-reflective, band-pass filters. The circular polarizing fur-
ther enhances contrast by reducing the light that travels through
the filter 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 Homalite, 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 Plas-
tic Corp., Burlingame, CA; Photo Chemical Products of Califor-
nia, Santa Monica, CA; I.E.E.-Atlas, Van Nuys, CA.

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SCDQ5541/5542/5543/5544/P/Q/R

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Figure 11. SCDQ554XX Interface to Siemens/Intel 8031
Microprocessor (using serial port in mode 0)

Figure 12. SCDQ554XX Interface to Siemens/Intel 8031 Microprocessor (using one bit of parallel port as serial input)

Microprocessor Interface

The microprocessor interface is through the serial port, SPI port or one out of eight data bits on the eight bit parallel port and also
control 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.

Figure 13. SCDQ554XX Interface with Motorola 68HC05C4 Microprocessor (using SPI port)

SCDQ554XX

RST

XTAL

RXD

TXD

P3.3

.01

VCC

SDCLK

SData

Load

8031

SCDQ554XX

RST

XTAL

.01

VCC

SDCLK

SData

Load

8031

P0.0

P3.6

P3.0

SCDQ554XX

RST

XTAL

.01

VCC

SDCLK

SData

Load

68HC05

P0.0

SCLK

MOSI

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Data Contents for the Display in a Horizontal Format "

AB"

Step

D7 D6

D4 D3

Function

A
B (optional)

CLEAR
BRIGHTNESS SELECT

1
2
3
4
5
6

DIGIT D0 SELECT
ROW 0 D0 (

)

ROW 1 D0 (

)

ROW 2 D0 (

)

ROW 3 D0 (

)

ROW 4 D0 (

)

7
8
9
10
11
12

DIGIT D1 SELECT
ROW 0 D1 (A)
ROW 1 D1 (A)
ROW 2 D1 (A)
ROW 3 D1 (A)
ROW 4 D1 (A)

13
14
15
16
17
18

DIGIT D2 SELECT
ROW 0 D2 (B)
ROW 1 D2 (B)
ROW 2 D2 (B)
ROW 3 D2 (B)
ROW 4 D2 (B)

19
20
21
22
23
24

DIGIT D3 SELECT
ROW 0 D3 (

)

ROW 1 D3 (

)

ROW 2 D3 (

)

ROW 3 D3 (

)

ROW 4 D3 (

)

Loading Data into the Display

Use following procedure to load data into the display:
1. Power up the display.
2. Step A: software clear the display.
3. Step B: Load the Control Word with the desired

brightness level.

Load the Digit Address into the display.

Load display row and column data for the selected digit.

Repeat steps 4 and 5 for all digits.

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