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M5482
LED DISPLAY DRIVER
. . . . . . . . . .
2 DIGIT LED DRIVER (15 segments) CURRENT GENERATOR OUTPUTS (no resistor required) CONTINUOUS BRIGHTNESS CONTROL SERIAL DATA INPUT WIDE SUPPLY VOLTAGE OPERATION TTL COMPATIBILITY
Application Examples MICROPROCESSOR DISPLAYS INDUSTRIAL CONTROL INDICATOR RELAY DRIVER INSTRUMENTATION READOUTS
DIP20 (Plastic Package)
DESCRIPTION The M5482 is a monolithic MOS integrated circuit produced with an N-channel silicon gate technology. It utilizes the M5451 die packaged 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 through a variable resistor connected either to VDD or to a separate supply of 13.2V maximum. PIN CONNECTIONS
ORDER CODE : M5482B7
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 V DD
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
5482-01.EPS
May 1993
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M5482
BLOCK DIAGRAM
VDD
BRITGHTNESS CONTROL
OUTPUT BIT 15 OUTPUT BIT 1
10 9
1nF
13
8
35 OUTPUT BUFERS LOAD 35 LATCHES
SERIAL DATA
12 11
35 BIT SHIFT REGISTER RESET
CLOCK
1
ABSOLUTE MAXIMUM RATINGS
Symbol VDD VI VO (off) IO Ptot Tj Toper Tstg Supply Voltage Input Voltage Off State Output Voltage Output Sink Current Total Package Power Dissipation at 25 C at 85 C Junction Temperature Operating Temperature Range Storage Temperature Range Parameter Value - 0.3 to 15 - 0.3 to 15 15 40 1.5 800 150 - 25, + 85 - 65, + 150 Unit V V V mA W mW C C
5482-01.TBL
C
Stresses in excess of those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions in excess of those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
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5482-02.EPS
M5482
STATIC ELECTRICAL CHARACTERISTICS (Tamb within operating range, VDD = 4.75V to 13.2V, VSS = 0V,unless otherwise specified)
Symbol VDD IDD VI Parameter Supply Voltage Supply Current Input Voltages Logical "0" Level Logical "1" Level Brightness Input Current (note 2) Brightness Input Voltage (pin 9) Off State Output Voltage Output Sink Current (note 3) Segment OFF Segment ON Test Conditions VDD = 13.2 V 10 A Input Bias 4.75 VDD 5.25 VDD > 5.25 Input Current = 750 A Tamb = 25oC - 0.3 2.2 VDD - 2 0 3 Min. 4.75 Typ. Max. 13.2 7 0.8 VDD VDD 0.75 4.3 13.2 VO = 3 V VO = 1 V (note 4) Brightness In. = 0 A Brightness In. = 100 A Brightness In. = 750 A 10 0 2 12 0 2.7 15 10 4 25 0.5 20 Unit V mA V V V mA V V A A mA mA MHz %
IB VB VO(off) IO
fclock IO
Notes : 1. 2. 3. 4.
Input Clock Frequency Output Matching (note 1)
Output matching is calculated as the percent variation from IMAX + IMIN/2. With a fixed resistor on the brightness input some variation in brightness will occur from one device to another. Absolute maximum for each output should be limited to 40 mA. The VO voltage should be regulated by the user.
FUNCTIONAL DESCRIPTION The M5482 uses the M5451 die which is packaged to operate 2-digit alphanumeric displays with minimal interface with the display and the data source. Serial data transfer from the data source to the display driver is accomplished with 2 signals, 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 Data Format
1 CLOCK START DATA BIT 1
current for LED 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 times greater than the current into Pin 9, which is set by an external variable resistor. There is an internal limiting resistor of 400 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 clock, which loads the 35 bits of the shift registers into the latches.
36
BIT 34
BIT 35
LOAD (INTERNAL)
5482-03.EPS
RESET (INTERNAL)
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5482-02.TBL
M5482
At the low state of the clock a RESET signal is generated which clears all the shift registers for the next set of data. The shift registers 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 START bit and the first clock return the chip to its normal operation. Figure 3 shows the timing relationships between Data and Clock. A maximum clock frequency of 0.5 MHz is assumed. 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 outputs are used it is possible to either increase the current Figure 4 : Serial Data Bus / Outputs Correspondance
5451 5482 5451 5482 35 15 17 X 34 X 16 8 33 X 15 7 32 X 14 6 31 X 13 5 30 14 12 X 29 13 11 X 28 X 10 X 27 X 9 X 26 X 8 4 25 X 7 3 24 12 6 2 23 11 5 1 22 10 4 X 21 9 3 X 20 X 2 X 19 X 1 X 18 X START START START START
5482-03.TBL 5482-05.EPS
per output or operate the part at higher than 1V VOUT. The following equation can be used for calculations. Tj [(VOUT)(ILED)(no.of segments) + VDD . 7 mA] (80 C/W) + Tamb where : Tj = junction temperature (150 C max) VOUT = the voltage at the LED driver outputs ILED = the LED current 80 C/W = thermal coefficient of the package Tamb = ambient temperature Figure 3
CLOCK
300ns (min.)
TYPICAL APPLICATION BASIC electronically tuned TV system.
LED DISPLAY
15 SEGMENTS
M5482
DISPLAY DRIVER
KEYBOARD
PROCESSOR
PLL SYNTHESIZER
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5482-04.EPS
DATA
M5482
POWER DISSIPATION OF THE IC The power dissipation of the IC can be limited using different configurations.
a)
+V C
R
b)
+V C
VD
V OUT
5482-06.EPS
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 segments activated.
c)
+VC
In this application R must be chosen taking into account the worst operating conditions. R is determined by the maximum number of segments activated. VC - VD MAX - VO MIN R= NMAX ID 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 dissipation 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 Ptot limited.
V OUT +V D
In this configuration VOUT + VD is constant. The total power dissipation of the IC depends only on the number of segments activated.
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5482-08.EPS
5482-07.EPS
ID
M5482
PACKAGE MECHANICAL DATA 20 PINS - PLASTIC DIP
a1
I
b1 E
Z
b e3
B
e Z
D
20
11
F
L
1
10
Dimensions a1 B b b1 D E e e3 F i L Z
Min. 0.254 1.39
Millimeters Typ.
Max. 1.65
Min. 0.010 0.055
Inches Typ.
Max. 0.065
0.45 0.25 25.4 8.5 2.54 22.86 7.1 3.93 3.3 1.34
0.018 0.010 1.000 0.335 0.100 0.900 0.280 0.155 0.130 0.053
DIP20.TBL
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility 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. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips I2C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to the I2C Standard Specifications as defined by Philips. SGS-THOMSON Microelectronics GROUP OF COMPANIES 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.
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PM-DIP20.EPS

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