Datasheet M5482 Datasheet (SGS Thomson Microelectronics)

.

2 DIGIT LED DRIVE R (15 segments)

.

CURRENT GENERATOR OUTPUTS (no re­sistor required)

.

CONTINUOUS BRIGHTNESS CONTROL

.

SERIAL DATA INPUT

.

WIDE SUPPLY VOLTAGE OPERA TION

.

TTL CO MPAT IB ILI TY

Application Examples

.

MICROPROCESSOR DISPLAYS

.

INDUSTRIAL CONTROL INDICATOR

.

RELAY DRIVER

.

INSTRUMENTATION READOUTS

M5482

LED DISPLAY DRIVER

DIP20

(Plastic Package)

DESCRIPTIO N

The M5482 is a monolithic MOS integrated circuit
produced with an N-channel silicon gate technol­ogy. It utilizes the M5451 die pack aged in a 20-pin
plastic package copper frame, making it ideal for a
2-digit display . A single pin controls the LED display
brightness by setting a reference current thro ugh a
variable resistor connected either to V
separate supply of 13.2V maximum.

PIN CONN E CTI O NS

OUTPUT BIT 8
OUTPUT BIT 7
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
OUTPUT BIT 3
OUTPUT BIT 2
OUTPUT BIT 1

BRIGHTNESS CONTROL

or to a

DD

V

DD

ORDER CODE : M5482B7

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

OUTPUT BIT 9
OUTPUT BIT 10
OUTPUT BIT 11
OUTPUT BIT 12
OUTPUT BIT 13
V

SS

OUTPUT BIT 14
OUTPUT BIT 15
DATA IN
CLOCK

May 1993

5482-01.EPS

1/6

M5482

BLOCK DIAGRAM

BRITGHTN ESS
CONT ROL

V

DD

OUTPUT

BIT 15

10 8

13

OUTPUT

BIT 1

35 OUTPUT BUFERS

35 LATCHES

35 BIT SHIFT REGISTER

LOAD

RESET

1nF

SERIAL
DATA

CLOCK

9

12

11

1

ABSOL UTE MAX IM UM R ATINGS

Symbol Parameter Value Unit

V

DD

V

V

O (off)

I

O

P

tot

T

T

oper

T

stg

Stresses in excess of those listed under "Absolute Maximum Rat ings" may cause permanent damage to the device. This is a stress rat ing only
and functional operation of the device at these or any other conditions in excess of those indicate d in the operational sections of this specification
is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage – 0.3 to 15 V
Input Voltage – 0.3 to 15 V

I

Off State Output Voltage 15 V

Output Sink Current 40 mA
Total Package Power Dissipation at 25 °C

at 85 °C

Junction Temperature 150 °C

j

1.5

800

Operating Temperature Range – 25, + 85 °C
Storage Temperature Range – 65, + 150 °C

W

mW

5482-02.EPS

5482-01.TBL

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M5482

STATIC ELECTRICAL CHARACTERISTICS

(T

within operating range, VDD = 4.75V to 13.2V, VSS = 0V,unless otherwise specified)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

I

V

V

O(off)

f

clock

Notes : 1. Output matching is calculated as the percent variation from I

Supply Voltage 4.75 13.2 V

DD

Supply Current VDD = 13.2 V 7 mA

DD

Input Voltages

V

I

Logical "0" Level
Logical "1" Level

I

Brightness Input Current (note 2) 0 0.75 mA

B

Brightness Input Voltage (pin 9) Input Current = 750 µA

B

± 10 µA Input Bias

4.75 ≤ V
VDD > 5.25

T

amb

DD

= 25oC

≤ 5.25

– 0.3

2.2

VDD – 2

3 4.3 V

Off State Output Voltage 13.2 V

I

Output Sink Current (note 3)

O

Segment OFF
Segment ON

VO = 3 V

= 1 V (note 4)

V

O

Brightness In. = 0 µA
Brightness In. = 100 µA
Brightness In. = 750 µA

12

0
2

2.7
15

Input Clock Frequency 0 0.5 MHz

I

Output Matching (note 1) ± 20 %

O

+ I

/2.

MAX

2. With a fixed resistor on the brightness input some variation in brightness will occur from one device to another.

3. Absolute maximum for each output should be limited to 40 mA.

4. The V

voltage should be regulated by the user.

O

MIN

0.8
V
V

DD
DD

10
10

4

25

V
V
V

µA
µA

mA
mA

5482-02.TBL

FUNCTIONAL DESCRIPTION

The M5482 uses the M5451 die which is packaged
to operate 2-digit alphanumeric displays with m in i­mal interface w ith the dis p lay and the dat a s ourc e.
Serial data transfer from the data source to the
display driver is accomplished with 2 s ignals, serial
data and clock. Using a format of a leading "1"
followed by the 35 data bits allows data transfer
without an additional load signal.

The 35 data bits are latched after the 36th bit is
complete, thus providing non-multiplexed, direct
drive to the display. Outputs change only if the
serial data bits differ from the previous time. Display
brightness is determined by control of the output

Figure 2 : Input Dat a Form at

1

CLOCK

DATA

LOAD
(INTERNAL)

START

BIT 1

current for LE D displays. A 1nF capacitor should be
connected to brightness control, Pin 9, to prevent
possible oscillations.

A block diagram is shown in Figure 1. The output
current is typically 20 tim es greater than the current
into Pin 9, which is set by an external variable
resistor.

There is an internal limiting resistor of 400Ω nomi­nal value.

Figure 2 shows the input data format. A start bit of
logical "1" precedes the 35 bits of data. At the 36th
clock a LOAD signal is generated synchronously
with the high state of the cloc k, which loads the 3 5
bits of the shift registers into the latches.

36

BIT 34 BIT 35

RESET
(INTERNAL)

5482-03.EPS

3/6

M5482

At the low state of the clock a RESET signal is
generated which clears all the shift regist ers for the
next set of data. The shift regist ers are static master
slave configurations. There is no clear for the mas­ter portion of the first shift register, thus allowing
continuous operation.

There must be a complete set of 36 clocks or the
shift registers will not clear.

When power is first applied to the chip an internal
power ON reset signal is generated which resets
all registers and all latches . The ST AR T bit and the
first clock return the chip to its normal operation.

Figure 3 shows the timing relationships between

per output or operate the part at higher than 1V
V

.

OUT

The following equation can be used for calcula­tions.
T

≡ [(V

j

(80 °C/W) + T

OUT

)(I

)(no.of segments) + VDD . 7 mA]

LED

amb

where :
T

= junction temperature (150 °C max)

j

V

= the voltage at the LED driver outputs

OUT

I

= the LED current

LED

80 °C/W = thermal coefficient of the package
T

= ambient temperature

amb

Figure 3

Data and Clock.
A maximum clock frequency of 0.5 MHz is as-

sumed.

CLOCK

Figure 4 shows the Output Data Format for the
M5482. Because it uses only 15 of the possible 35
outputs, 20 of the bits are "Don’t Cares".

For applications where a lesser number of output s
are used it is possible to either increase the current

DATA

300ns (min.)

Figure 4 : Serial Data Bus / Outputs Correspondance

5451 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 START
5482 15XXXX1413XXXX1211109XXXSTART

5482-04.EPS

5451 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 START
5482 X8765XXXX4321XXXX START

TYPICAL APPL ICA T ION

BASIC electronically tuned TV syst em.

LED DISPLAY

15 SEGMENTS

M5482

DISPLAY DRIVER

KEYBOARD

PROCESSO R

PLL

SYNTHESIZER

5482-03.TBL

5482-05.EPS

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M5482

POWER DISSIPATION OF THE IC

The power dissipation of the IC can be limited using
different configurations.

a)

V

V

OUT

+V

C

R

I

D

D

In this application R must be chosen taking into
account the worst operating conditions.

R is determined by the maximum number of seg­ments activated.

R =

VC − V

D MAX

N

MAX

− V

⋅ I

O MIN

D

The worst case condition for the device is when
roughly half of the maximum number of segments
are activated.

It must be checked that the total power diss ipation
does not exceed the absolute maximum ratings of
the device.

In critical cases more resistors can be used in
conjunction with groups of segments. In this case
the current variation in the single resistor is reduced
and P

limited.

tot

+V

b)

C

In this configuration the drop on the serial con­nected diodes is quite stable if the diodes are
properly chosen.

The total power dissipation of the IC is, in first
approximation, depending only on the number of

5482-06.EPS

segments activated.

+V

c)

In this configuration V

C

V

OUT+VD

+ VD is constant. The total

OUT

power dissipation of the IC depends only on the
number of segments activated.

5482-07.EPS

5482-08.EPS

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M5482

PACKA G E MECHANICAL DATA

20 PINS - PLASTIC DIP

I

a1

L

Z

e3

b

B

e

E

Z

D

20 11

F

110

Dimensions

Min. Typ. Max. Min. Typ. Max.

a1 0.254 0.010

B 1.39 1.65 0.055 0.065
b 0.45 0.018

b1 0.25 0.010

D 25.4 1.000
E 8.5 0.335

e 2.54 0.100

e3 22.86 0.900

F 7.1 0.280

i 3.93 0.155

L 3.3 0.130

Z 1.34 0.053

Millimeters Inches

b1

PM-DIP20.EPS

DIP20.TBL

Information furnished i s believed to be accurate and rel iabl e. However, S GS-THOMSON Microel ectroni cs assumes no responsibil ity
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.

© 1994 SGS-THOMSON Microelec tronics - All Rights Reserved

2

Purchase of I

2

C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to

I

Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco

The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips

2

C Standard Specifications as defined by Philips.

the I

SGS-THOMSON Microelectronics GROUP OF COMPANIES

6/6