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| M5480 LED DISPLAY DRIVER FEATURES SUMMARY 3 1/2 DIGIT LED DRIVER (23 segments) Figure 1. Package CURRENT GENERATOR OUTPUTS (no resistors required) CONTINUOUS BRIGHTNESS CONTROL SERIAL DATA INPUT NO LOAD SIGNAL REQUIRED WIDE SUPPLY VOLTAGE OPERATION TTL COMPATIBILITY 1 28 Application Examples: MICROPROCESSOR DISPLAY INDUSTRIAL CONTROL INDICATION RELAY DRIVER INSTRUMENTATION READOUTS PDIP28 (Plastic Package) DESCRIPTION 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 plastic 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. REV. 2 April 2004 1/10 M5480 Figure 2. Pin Connections VSS 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 VDD 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 DATA IN CLOCK IN Figure 3. Block Diagram VDD BRITGHTNESS CONTROL OUTPUT BIT 23 OUTPUT BIT 1 14 13 1nF 17 12 35 OUTPUT BUFFERS LOAD 35 LATCHES SERIAL DATA 16 15 35 BIT SHIFT REGISTER RESET CLOCK 1 2/10 M5480 Table 1. Absolute Maximum Ratings Symbol VDD VI VO(off) IO PTOT Tj TOP TSTG Supply Voltage Input Voltage Off State Output Voltage Output Sink Current Total Package Power Dissipation at 25C Total Package Power Dissipation at 85C Junction Temperature Operating Temperature Range Storage Temperature Range Parameter Value - 0.3 to 15 - 0.3 to 15 15 40 940 490 150 - 25 to 85 - 65 to 150 Unit V V V mA mW mW C C C Note: 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. Table 2. 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.,75 Supply Current Input Voltage Logical "0" Level Logical "1" Level IB VB VO(off) IO Brightness Input Current (note 2) Brightness Input Voltage (pin 13) Off State Out. Voltage Out. Sink Current (note 3) Segment OFF Segment ON VO = 3V VO = 1V (note 4) Brightness In. = 0A Brightness In. = 100A Brightness In. = 750A fclock IO Note: 1. 2. 3. 4. Test Conditions VDD = 13.2V 10A Input Bias 4.75 VDD 5.25 VDD > 5.25 Input Current = 750A, Tamb = 25C Min. Typ. Max. 13.2 7 Unit V mA V V V mA V V A A mA mA MHz % - 0.3 2.2 VDD - 2 0 3 13.2 0.08 VDD VDD 0.75 4.3 18 10 0 2 12 0 2,7 15 10 4 25 0.5 20 Input Clock Frequency Output Matching (note 1) Output matching is calculated as the percent variation from I MAX + 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 40mA. The VO voltage should be regulated by the user. 3/10 M5480 FUNCTIONAL DESCRIPTION The M5480 is specifically designed to operate 31/ 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. A block diagram is shown in Figure 3. 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 4 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. Figure 4. Input Data Format 1 CLOCK START DATA BIT 1 BIT 34 BIT 35 36 LOAD (INTERNAL) RESET (INTERNAL) 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 5 shows the timing relationships between Data, and Clock. A maximum clock frequency of 0.5MHz is assumed. Table 3 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 cur- rent 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] (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 4/10 M5480 Figure 5. CLOCK DATA 300ns (min.) Table 3. 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 11 X 28 X 10 X 27 18 9 X 26 X 8 7 25 17 7 6 24 16 6 5 23 15 5 4 22 14 4 3 21 13 3 2 20 12 2 1 19 X 1 X START START START START TYPICAL APPLICATION Figure 6. Basic 3 1/2 Digit Interface 23 SEGMENTS M5480 DISPLAY DRIVER CLOCK DATA 5/10 M5480 POWER DISSIPATION OF THE IC The power dissipation of the IC can be limited using different configurations. Figure 7. +VC Figure 8. +VC R ID VD VOUT In this application R must be chosen taking into account the worst operating conditions. R is determined by the maximum number of segments activated. V -V -V C DMAX OMIN R = ---------------------------------------------------------------N L MAX D 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. Figure 9. +VC 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. VOUT+ VD In this configuration VOUT + VD is constant. The total power dissipation of the IC depends only on the number of segments activated. 6/10 M5480 PART NUMBERING Table 4. Order Codes Part Number M5480 Package PDIP28 Temperature Range -25 to 85 C 7/10 M5480 PACKAGE MECHANICAL Table 5. PDIP28 - Mechanical Data millimeters Symbol Typ a1 b b1 b2 D E e e3 F i L 4.445 3.3 15.2 2.54 48.26 14.1 0.175 0.130 0.23 1.27 52.58 16.68 0.598 0.100 1.900 0.555 Min 0.63 0.45 0.31 0.009 0.050 2.070 0.657 Max Typ Min 0.025 0.018 0.012 Max inches Figure 10. PDIP28 - Package Dimensions a1 L I b1 b b2 e3 e E D 28 15 1 14 Note: Drawing is not to scale 8/10 F M5480 REVISION HISTORY Table 6. Revision History Date May-1993 14-Apr-2004 Revision 1 2 First Issue Stylesheet update. No content change. Description of Changes 9/10 M5480 Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2004 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States www.st.com 10/10 |
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