MM5452,MM5453 MM5452/MM5453 Liquid Crystal Display Drivers Literature Number: SNLS367B MM5452/MM5453 Liquid Crystal Display Drivers General Description Features The MM5452 is a monolithic integrated circuit utilizing CMOS metal gate, low threshold enhancement mode devices. It is available in a 40-pin molded package. The chip can drive up to 32 segments of LCD and can be paralleled to increase this number. The chip is capable of driving a 41/2-digit 7-segment display with minimal interface between the display and the data source. The MM5452 stores display data in latches after it is clocked in, and holds the data until new display data is received. Serial data input No load signal required DATA ENABLE (MM5452) Wide power supply operation TTL compatibility 32 or 33 outputs Alphanumeric and bar graph capability Cascaded operation capability Applications COPSTM or microprocessor displays Industrial control indicator Digital clock, thermometer, counter, voltmeter Instrumentation readouts Remote displays Block Diagram 613701 FIGURE 1. (c) 2008 National Semiconductor Corporation 6137 www.national.com MM5452/MM5453 Liquid Crystal Display Drivers December 17, 2008 MM5452/MM5453 Recommended Operating Conditions Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Voltage at Any Pin, Referenced to Gnd Storage Temperature Power Dissipation at 25C Power Dissipation at 70C Junction Temperature Lead Temperature (Soldering, 10s) Electrical Characteristics Parameter VDD Operating Temperature -0.3V to +10V -65C to +150C 350mW 300mW +150C 300C TA within operating range, VDD = 3.0V to 10V, VSS = 0V unless otherwise specified. Conditions Min Max Units 10 V VDD= 5V 10 A VDD= 10V 40 A VDD= 3V 0.4 V VDD= 5V 0.8 V 0.8 V Supply Voltage, VDD Average Supply Current, IDD Input Logical '0' Voltage, VIL 3V to 10V -40C to 85C Typ 3 All Outputs Open, Clock=Gnd, Data=Gnd,OSC=Gnd, BP_IN @ 32Hz VDD= 10V Input Logical '1' Voltage, VIH VDD= 3V 2.0 V VDD= 5V 2.0 V VDD= 10V 8.0 V Segment Sink Current, IOL VDD= 3V, VOUT= 0.3V -20 -40 A Segment Source Current, IOH VDD= 3V, VOUT= 2.7V 20 40 A Backplane Out Sink Current, IOL VDD= 3V, VOUT= 0.3V -320 -500 A Backplane Out Source Current, VDD= 3V, VOUT= 2.7V IOH 320 500 A Segment Output Offset Voltage Segment Load = 250pF (Note 2) +/-50 mV Backplane Output Offset Voltage Backplane Load = 8750pF (Note 2) +/-50 mV Backplane Out Frequency ROSC_IN= 50k, COSC_IN= 0.01F Clock Input Frequency, fCLOCK VDD= 3V (Notes 2, 3) 500 VDD= 5V (Note 2) 750 kHz VDD= 10V (Note 2) 1.0 MHz 60 % 75 Hz kHz Clock Input Duty Cycle 40 Data Input Set-Up Time, tDS 300 ns Data Input Hold Time, tDH 300 ns DataEnable Set-up Time, tDES 100 ns Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of "Electrical Characteristics" specifies conditions of device operation. Note 2: This parameter is guaranteed (but not production tested) over the operating temperature range and the operating supply voltage range. Not to be used in Q.A. testing. Note 3: AC input waveform for test purposes: tr 20ns, tf 20ns, fCLOCK= 500kHz, Duty Cycle = 50% 10% Note 4: Clock input rise time (tr) and fall time (tf) must not exceed 300ns www.national.com 2 MM5452/MM5453 Connection Diagrams 613702 613703 Top View Order Number MM5452N See NS Package Number N40A Top View Order Number MM5453N See NS Package Number N40A 613711 613712 Top View Order Number MM5452V See NS Package Number V44A Top View Order Number MM5453V See NS Package Number V44A 3 www.national.com MM5452/MM5453 Figure 3 shows the input data format. A start bit of logical "1" precedes the 32 bits of data. At the 36th clock a LOAD signal is generated synchronously with the high state of the clock, which loads the 32 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 configuration. There is no clear for the master portion of the first shift register, thus allowing continuous operation. If the clock is not continuous, there must be at least a complete set of 36 clocks otherwise the shift registers will not load and clear. Bit 1 is the first bit following the start bit and it will appear on device pin 18 of the MM5452N and MM5453N, and on device pin 20 of the MM5452V and MM5453V. Figure 2 shows the timing relationships between data, clock and DATA ENABLE. Functional Description The MM5452 is specifically designed to operate 41/2-digit 7segment 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. Since the MM5452 does not contain a character generator, the formatting of the segment information must be done prior to inputting the data to the MM5452. Using a format of a leading "1" followed by the 32 data bits allows data transfer without an additional load signal. The 32 data bits are latched after the 36th clock is complete, thus providing nonmultiplexed, direct drive to the display. Outputs change only if the serial data bits differ from the previous time. A block diagram is shown in Figure 1. For the MM5452 a DATA ENABLE is used instead of the 33rd output. If the DATA ENABLE signal is not required, the 33rd output can be brought out. This is the MM5453 device. 613704 FIGURE 2. Timing Diagram 613705 FIGURE 3. Input Data Format Figure 4 shows a typical application. Note how the input data maps to the output pins and the display. The MM5452 and MM5453 do not have format restrictions, as all outputs are www.national.com controllable. The application assumes a specific display pinout. Different display/driver connection patterns will, of course, yield a different input data format. 4 MM5452/MM5453 613706 Consult LCD manufacturer's data sheet for specific pinouts. FIGURE 4. Typical 41/2-Digit Display Application 5 www.national.com MM5452/MM5453 613707 *The minimum recommended value for R for the oscillator input is 9 k. An RC time constant of approximately 4.91 x 10-4 should produce a backplane frequency between 30 Hz and 150 Hz. FIGURE 5. Parallel Backplane Outputs 613708 FIGURE 6. External Backplane Clock Figure 7 shows a four wire remote display that takes advantage of the device's serial input to move many bits of display information on a few wires. Using an external clock allows synchronizing the display drive with AC power, internal clocks, or DVM integration time to reduce interference from the display. Figure 8 is a general block diagram that shows how the device's serial input can be used to advantage in an analog display. The analog voltage input is compared with a staircase voltage generated by a counter and a digital-to-analog converter or resistor array. The result of this comparison is clocked into the MM5452, MM5453. The next clock pulse increments the staircase and clocks the new data in. USING AN EXTERNAL CLOCK The MM5452/MM5453 LCD Drivers can be used with an externally supplied clock, provided it has a duty cycle of 50%. Deviations from a 50% duty cycle result in an offset voltage on the LCD. In Figure 6, a flip-flop is used to assure a 50% duty cycle. The oscillator input is grounded to prevent oscillation and reduce current consumptions in the chips. The oscillator is not used. www.national.com 6 system can be used for status indicators, spectrum analyzers, audio level and power meters, tuning indicators, and other applications. 613709 FIGURE 7. Four Wire Remote Display 613710 Data is high until staircase > input FIGURE 8. Analog Display 7 www.national.com MM5452/MM5453 With a buffer amplifier, the same staircase waveform can be used for many displays. The digital-to-analog converter need not be linear; logarithmic or other non-linear functions can be displayed by using weighted resistors or special DACs. This MM5452/MM5453 Physical Dimensions inches (millimeters) unless otherwise noted 40-Pin Molded Dual-In-Line Package (N) Order Number MM5452N or MM5453N NS Package Number N40A 44-Pin Plastic Chip Carrier (V) Order Number MM5452V or MM5453V NS Package Number V44A www.national.com 8 MM5452/MM5453 Notes 9 www.national.com MM5452/MM5453 Liquid Crystal Display Drivers Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy PowerWise(R) Solutions www.national.com/powerwise Solutions www.national.com/solutions Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero Temperature Sensors www.national.com/tempsensors Solar Magic(R) www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless Analog University(R) www.national.com/AU THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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