LED Display Driver - Microchip Technology

1 2016 Microchip Technology 1MM5450/51 Features Continuous Brightness Control Serial Data Input No Load Signal Requirement Enable (MM5450 Only) Wide Power Supply Operation TTL Compatibility 34 or 35 Outputs, 15 mA Capability Alphanumeric CapabilityApplications Industrial Control Indicator Relay Driver Digital Clock, Thermometer, Counter, Voltmeter Instrumentation ReadoutsGeneral DescriptionThe MM5450 and MM5451 LED Display drivers aremonolithic MOS IC s fabricated in an N-Channel,metal-gate process. The Technology produceslow-threshold, enhancement-mode, and ion-implanteddepletion-mode single pin controls the LED Display brightness bysetting a reference current through a variable resistorconnected to the Diagram35 OUTPUT BUFFERS35 LATCHES35-BIT SHIFT REGISTERLOADRESETRESET(only availablein die form)SERIAL DATA22 CLOCK21 DATA ENABLE/OUT 35(See Note 1)23192024 OUT 3418 OUT 11 BRIGHTNESSCONTROLVDDNote 1: Pin in Data Enable in MM5450 Pin in Output 25 in MM5451 LED Display DriverMM5450/51DS20005651A-page 2 2016 Microchip Technology Diagram.

2 DieVOUTPUT BIT 24MM5450/5451 DIE PINOUTOUTPUT BIT 25 OUTPUT BIT 26 OUTPUT BIT 27 OUTPUT BIT 28 OUTPUT BIT 29 OUTPUT BIT 30 OUTPUT BIT 31 OUTPUT BIT 32 OUTPUT BIT 33 SSVOUTPUT BIT 13 OUTPUT BIT 14 OUTPUT BIT 15 OUTPUT BIT 16 OUTPUT BIT 17 OUTPUT BIT 22 OUTPUT BIT 23 OUTPUT BIT 18 OUTPUT BIT 19 OUTPUT BIT 20 OUTPUT BIT 21 SSVSSOUTPUT BIT 12 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 VOUTPUT BIT 34 OUTPUT BIT 35 ENABLEDATACLKBRIGTNESS CONTROLRESETOUTPUT BIT 1 OUTPUT BIT 2DD 2016 Microchip Technology 3MM5450/51 Connection Diagram: Dual-Inline Package (DIP)Connection Diagram: Plastic-Leaded Chip Carrier (PLCC)1402393384375366357348339321031113 0122913281427152616251724182319222021 OUTPUT BIT 18 CLOCK INMM5450 YNVSSVDDOUTPUT BIT 17 OUTPUT BIT 16 OUTPUT BIT 15 OUTPUT BIT 14 OUTPUT BIT 13 OUTPUT BIT 12 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 CONTROLDATA INDATA ENABLEOUTPUT BIT 19 OUTPUT BIT 20 OUTPUT BIT 21 OUTPUT BIT 22 OUTPUT BIT 23 OUTPUT BIT 24 OUTPUT BIT 25 OUTPUT BIT 26 OUTPUT BIT 27 OUTPUT BIT 28 OUTPUT BIT 29 OUTPUT BIT 30 OUTPUT BIT 31 OUTPUT BIT 32 OUTPUT BIT 33 OUTPUT BIT 3414023933843753663573483393210311130122 913281427152616251724182319222021 OUTPUT BIT 18 CLOCK INMM5451 YNVSSVDDOUTPUT BIT 17 OUTPUT BIT 16 OUTPUT BIT 15 OUTPUT BIT 14 OUTPUT BIT 13 OUTPUT BIT 12 OUTPUT BIT 11 OUTPUT BIT 10 OUTPUT BIT 9

3 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 CONTROLDATA INOUTPUT BIT 19 OUTPUT BIT 20 OUTPUT BIT 21 OUTPUT BIT 22 OUTPUT BIT 23 OUTPUT BIT 24 OUTPUT BIT 25 OUTPUT BIT 26 OUTPUT BIT 27 OUTPUT BIT 28 OUTPUT BIT 29 OUTPUT BIT 30 OUTPUT BIT 31 OUTPUT BIT 32 OUTPUT BIT 33 OUTPUT BIT 34 OUTPUT BIT 3512393384375367358349331032113112301329 14151617MM5450 YVVSSOUTPUT BIT 15 OUTPUT BIT 14 OUTPUT BIT 16 OUTPUT BIT 17 OUTPUT BIT 13 OUTPUT BIT 12 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 23 OUTPUT BIT 24 OUTPUT BIT 25 OUTPUT BIT 26 OUTPUT BIT 27 NCOUTPUT BIT 28 OUTPUT BIT 29 OUTPUT BIT 30 OUTPUT BIT 31 OUTPUT BIT 32NC64443424140 NCOUTPUT BIT 18 OUTPUT BIT 19 OUTPUT BIT 20 OUTPUT BIT 21 OUTPUT BIT 3 OUTPUT BIT 2 OUTPUT BIT 1 BRIGHTNESS CONTROLNCCLOCK INDATA INDATA ENABLEOUTPUT BIT 34 OUTPUT BIT 332322212019182425262728 OUTPUT BIT 22 VDD1239338437536735834933103211311230132 914151617MM5451 YVVSSOUTPUT BIT 14 OUTPUT BIT 15 OUTPUT BIT 16 OUTPUT BIT 17 OUTPUT BIT 13 OUTPUT BIT 12 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 23 OUTPUT BIT 24 OUTPUT BIT 25 OUTPUT BIT 26 OUTPUT BIT 27 NCOUTPUT BIT 28 OUTPUT BIT 29 OUTPUT BIT 30 OUTPUT BIT 31 OUTPUT BIT 32NC64443424140 NCOUTPUT BIT 18 OUTPUT BIT 19 OUTPUT BIT 20 OUTPUT BIT 21 OUTPUT BIT 3 OUTPUT BIT 2 OUTPUT BIT 1 BRIGHTNESS CONTROLNCCLOCK INDATA INOUTPUT BIT 35 OUTPUT BIT 34 OUTPUT BIT 332322212019182425262728 OUTPUT BIT 22 VDDMM5450/51DS20005651A-page 4 2016 Microchip Technology CHARACTERISTICSA

4 Bsolute Maximum Ratings Voltage (Any Pin).. VSS to VSS + 12 VPower Dissipation (+25 C) ..1 WPower Dissipation (+85 C) ..560 mWOperating Ratings Supply Voltage (VDD VSS) .. + to +11V Notice: Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the is a stress rating only and functional operation of the device at those or any other conditions above those indicatedin the operational sections of this specification is not intended. Exposure to maximum rating conditions for extendedperiods may affect device reliability. Notice: The device is not guaranteed to function outside its operating ratings. 2016 Microchip Technology 5MM5450/51 TABLE 1-1:ELECTRICAL CHARACTERISTICSE lectrical Characteristics: VDD 11V, VSS = 0V; TA = 25 C, bold values valid for 40 C TA +85 C, unless otherwise Supply Current 25 C to +85 C, excluding output loads 10 40 C to +85 C, excluding output loadsData Input VoltageVL level, 10 A input VDDL ogic-1 level, VDD VDD 2 VDDVDD > Control Input Current 0 1 Output Sink Current 10 ASegment off, VOUT = 10 Segment on, VOUT = , Note 2;Brightness input = 0 on, VOUT = , Note 2;Brightness input = 100 A15 25 Segment on, VOUT = , Note 2.

5 Brightness input = 750 ABrightness Control Input Voltage current = 750 AOutput Matching 20%Note 3, Note 4 Clock Input FrequencyfC 500kHzNote 5, Note 6 Clock Input High TimetH950 nsNote 5, Note 6 Clock Input Low TimetL950 nsNote 5, Note 6 Data Input Setup TimetDS300 ns Data Input Hold Setup TimetDH300 ns Data Enable Input Setup TimetDES100 ns Reset Pad Current 8 8 1:With a fixed resistor on the brightness input pin, some variation in brightness will occur among :See Figure 2-1, Figure 2-2, and Figure 2-3 for recommended operating conditions and limits. Absolute maximum for each output should be limited to 40 :Output matching is calculated as the percent variation of (IMAX + IMIN) / :VOUT should be regulated by user. See Figure 2-2 and Figure 2-3 for allowable VOUT vs. IOUT :AC input waveform specification for test purpose: tR 200 ns, tF 20 ns, f = 500 kHz, 50% 10% duty :Clock input rise and fall times must not exceed 300 6 2016 Microchip Technology SPECIFICATIONS (Note 1) RangesAmbient Temperature RangeTA 40 +85 C Storage Temperature RangeTS 65 +150 C Junction TemperatureTJ +150 C Lead Temperature +300 C Note 1:The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air ( , TA, TJ, JA).

6 Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum +125 C rating. Sustained junction temperatures above +125 C can impact the device reliability. 2016 Microchip Technology 7MM5450 PERFORMANCE CURVESFIGURE 2-1:Output Current vs. Number of Segments. FIGURE 2-2:Output Voltage vs. LED 2-3:Power Dissipation vs. :The graphs and tables provided following this note are a statistical summary based on a limited number ofsamples and are provided for informational purposes only. The performance characteristics listed hereinare not tested or guaranteed. In some graphs or tables, the data presented may be outside the specifiedoperating range ( , outside specified power supply range) and therefore outside the warranted OF SEGMENTSOUTPUT CURRENT (mA)V = 1 VOUTV = = 2 VOUTT = 85 (mA)LEDV (V )OUTOT = 85 CT = 150 C (MAX)AJ20 SEGM30 SEGM34 ( C)POWER DISSIPATION (W)34 SEGMENTSV = 1V15 mA/SEGMENTOUTSAFE OPERATINGAREA100MM5450/51DS20005651A-pag e 8 2016 Microchip Technology DESCRIPTIONThe MM5450 and MM5451 are designed to drive either4- or 5-digit alphanumeric LED displays with the addedbenefit of requiring minimal interface with the Display ordata is transferred serially via two signals: clock andserial data.

7 Data transfer without the addedinconvenience of an external load signal isaccomplished by using a format of a leading 1 followed by the allowed 35 data bits. These 35 data bitsare latched after the 36th has been transferred. Thisscheme provides non-multiplexed, direct drive to theLED Display . Characters currently displayed (thus, dataoutput) changes only if the serial data bits differ fromthose previously of the output current for LED displays providesfor the Display brightness. To prevent oscillations, a1 nF capacitor should be connected to pin 19,brightness Block Diagram is shown on page 1. For theMIC5450, the /DATA ENABLE is a metal option and isused instead of the 35th output. The output current istypically 20-times greater than the current into pin 19,which is set by an external variable is an external reset connection shown which isavailable on unpackaged (die) only.

8 ConnectionDiagram: Die illustrates the die pad locations forbonding in chip on board 3-1 shows the input data format. A leading 1 isfollowed by 35 bits of data. After the 36th had beentransferred, a LOAD signal is generated synchronouslywith the clock high state. This loads the 35 bits of datainto the latches. The low side of the clock is used togenerate a RESET signal which clears all shift registersfor the next set of data. All shift registers are staticmaster-slave, with no clear for the master portion of thefirst register, allowing continuous 3-1:Input Data must be a complete set of 36 clocks or the shiftregisters will not the chip first powers ON, an internal power ONreset signal is generated that resets all registers and alllatches. The START bit and the first clock return thechip to its normal Connection Diagram: Dual-Inline Package (DIP)and Connection Diagram: Plastic-Leaded Chip Carrier(PLCC) show the pinout of the MIC5450 and 1 is the first bit following the start bit and it willappear on pin 18.

9 A logical 1 at the input will turn onthe appropriate 3-2 shows the timing relationships betweendata, clock and /DATA ENABLE. A maximum clockfrequency of MHz is 3-2:Timing applications where a lesser number of outputs isused, it is possible to either increase the current peroutput, or operate the part at higher than 1V VOUT. Thefollowing equation can be used for 3-1:Equation 3-1 is used to plot Figure 2-1, Figure 2-2, andFigure (INTERNAL)RESET(INTERNAL)START BIT 1 BIT 363637 BIT 35 CLOCKDATADATA ENABLE300 nS MIN100 nS MINTJVOUTILED No of segments 124oC/WTA+ =Where:TJJunction Temperature (+150 C max.)VOUTV oltage at the LED Driver outputsILEDLED current124 C/W Thermal resistance of the packageTAAmbient temperature 2016 Microchip Technology 9MM5450 APPLICATIONSFIGURE 4-1:Typical Application of Constant Current Brightness 4-2:Brightness Control Varying the Duty 4-3:Basic Electronically Tuned Radio + 9240 RAW DC!

10 9 91KI19=2N2907I19 PIN 19 92015k 91kCD4046(VCO)5 VMM74HC12310 SMM5450Q19201 LED DISPLAY34MM5450 Display DRIVERELECTRONICTUNINGCONTROLLERPLLSYNTH ESIZERKEYBOARDSTATION DETECT, 10 2016 Microchip Technology 4-4:Duplexing Eight Digits with One 162 8, 40 32 3924 = = INDATA INVDDBRIGHTNESSCONTROL 2016 Microchip Technology 11MM5450 Marking Information40-Pin PDIP*ExampleXXXXXXWNNNXXXXXXXXMICREL6235 MM5451YN44-Pin PLCC*ExampleXXXXXXWNNNXXXXXXXXMICREL8943 MM5450 code or customer-specific informationYYear code (last digit of calendar year)YYYear code (last 2 digits of calendar year)WWWeek code (week of January 1 is week 01 )NNNA lphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn)*This package is Pb-free. The Pb-free JEDEC designator ( )can be found on the outer packaging for this package.