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M5480
LED DISPLAY DRIVER
. . . . . . . . . . .
3 1/2 DIGIT LED DRIVER (23 segments) CURRENT GENERATOR OUTPUTS (no resistors required) CONTINUOUS BRIGHTNESS CONTROL SERIAL DATA INPUT NO LOAD SIGNAL REQUIRED WIDE SUPPLY VOLTAGE OPERATION TTL COMPATIBILITY
Applications examples MICROPROCESSOR DISPLAYS INDUSTRIAL CONTROL INDICATION RELAY DRIVER INSTRUMENTATION READOUTS DESCRIPTION
DIP-28 (Plastic Package) ORDER CODE : M5480B7
The M5480 is a monolithic MOS integrated circuit produced with a N-channel silicon gate technology. It utilizes the M5451 die packaged in a 28-pin plas-tic package making it ideal for a 3 1/2 digit dispaly. A single pin controls the LED dispaly brightness by setting a reference current through a variable resistor connected either to VDD or to a separate supply of 13.2V maximum. The M5480 is a pin-to-pin replacement of the NS MM 5480. PIN CONNECTIONS
V SS OUTPUT BIT 11 OUTPUT BIT 10 OUTPUT BIT 9 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 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15
OUTPUT BIT 12 OUTPUT BIT 13 OUTPUT BIT 14 OUTPUT BIT 15 OUTPUT BIT 16 OUTPUT BIT 17 OUTPUT BIT 18 OUTPUT BIT 19 OUTPUT BIT 20 OUTPUT BIT 21 OUTPUT BIT 22 OUTPUT BIT 23
5480-01.EPS
DATA IN CLOCK IN
May 1993
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M5480
BLOCK DIAGRAM (Figure 1)
V DD
BRITGHTNESS CONTROL OUTPUT BIT 23 OUTPUT BIT 1
14 13
1nF
17
12
35 OUTPUT BUFERS LOAD
35 LATCHES
SERIAL DATA
16 15
35 BIT SHIFT REGISTER
RESET
CLOCK
1
ABSOLUTE MAXIMUM RATINGS
Symbol VDD VI VO (off) IO Ptot Tj Toper Tstg Parameter 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 Value - 0.3 to 15 - 0.3 to 15 15 40 940 490 150 - 25, + 85 - 65, + 150 Unit V V V mA mW mW C C 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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5480-01.TBL
5480-02.EPS
M5480
STATIC ELECTRICAL CHARACTERISTICS (Tamb within operating range, VDD = 4.75V to 13.2V, VSS = 0V,unless otherwise specified)
Symbol Parameter Supply Voltage VDD IDD Supply Current Input Voltages Logical "0" Level VI Logical "1" Level IB VB VO(off) IO Brightness Input Current (note 2) Brightness Input Voltage (pin 13) 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 = 750A, Tamb = 25oC Min. 4.75 - 0.3 2.2 VDD - 2 0 3 13.2 VO = 3 V VO = 1 V (note 4) Brightness In. = 0 A Brightness In. = 100 A Brightness In. = 750 A Typ. Max. 13.2 7 0.8 VDD VDD 0.75 4.3 18 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 %
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 M5480 is specifically designed to operate 3 1/2 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 nonmultiplexed, 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 current for LED displays. A 1nF capacitor should be connected to brightness control, pin 13, to prevent possible oscillations. Figure 2 : Input Data Format
1 CLOCK START DATA BIT 1
A block diagram is shown in Figure 1. The output current is typically 20 times greater than the current into pin 13, 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. 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 register, thus allowing continuous operation.
36
BIT 34
BIT 35
LOAD (INTERNAL)
5480-03.EPS
RESET (INTERNAL)
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5480-02.TBL
M5480
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 0.5MHz is assumed. Figure 4 shows the Output Data Format for the M5480. Because it uses only 23 of the possible 35 outputs, 12 of the bits are "Don't Care". For applications where a lesser number of outputs are used, it is possible to either increase the current per output, or operate the part at higher than 1V VOUT. The following equation can be used for calculations. Figure 4 : Serial Data Bus / Outputs Correspondance
5451 5480 5451 5480 35 X 18 X 34 23 17 X 33 22 16 X 32 21 15 11 31 20 14 10 30 19 13 9 29 X 12 8 28 X 11 X 27 18 10 X 26 X 9 X 25 17 8 7 24 16 7 6 23 15 6 5 22 14 5 4 21 13 4 3 20 12 3 2 19 X 2 1 1 X START START START START
5480-03.TBL 5480-06.EPS
Tj = [ (VOUT) (ILED) (No.of segments) + VDD . 7 mA ] (132 C/W) + Tamb where: Tj = junction temperature (150 C max) VOUT = the voltage at the LED driver outputs ILED = the LED current 132 C/W = thermal coefficient of the package Tamb = ambient temperature Figure 3
CLOCK
300ns (min.)
TYPICAL APPLICATION BASIC 3 1/2 Digit Interface.
a)
R
+V C
ID VD
23 SEGMENTS
M5480 DISPLAY DRIVER
5480-05.EPS
V OUT
CLOCK
DATA
POWER DISSIPATION OF THE IC The power dissipation of the IC can be limited using different configurations.
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 - VOUT MIN R= NMAX ID
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5480-04.EPS
DATA
M5480
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.
b)
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 depends, in a first approximation, only on the number of segments activated.
c)
+VC
+V C
V OUT +V D
5480-07.EPS
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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5480-08.EPS
M5480
PACKAGE MECHANICAL DATA 28 PINS - PLASTIC DIP
a1 I L
b1 b b2 e3 e E
D
28
15
F
1
14
Dimensions a1 b b1 b2 D E e e3 F i L
Min.
Millimeters Typ. 0.63 0.45 1.27
Max.
Min.
Inches Typ. 0.025 0.018 0.050
Max.
0.23
0.31 37.4 16.68 2.54 33.02 14.1 4.445 3.3
0.009
0.012 1.470 0.657 0.100 1.300 0.555 0.175 0.130
DIP28.TBL
15.2
0.598
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-DIP28.EPS

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