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MM5486N Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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MM5486N Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 8 page Functional Description The MM5486 is specifically designed to operate four-digit alphanumeric displays with minimal interface with the dis- play and the data source Serial data transfer from the data source to the display driver is accomplished with 3 signals serial data clock and load The data bits are latched by a positive-level load signal thus providing non-multiplexed di- rect drive to the display When load is high the data in the shift registers is displayed on the output drivers Outputs change only if the serial data bits differ from the previous time Display brightness is determined by control of the out- put current for LED displays A 0001 mF capacitor should be connected to brightness control pin 19 to prevent possi- ble oscillations The output current is typically 20 times greater than the current into pin 19 which is set by an exter- nal variable resistor There is an internal limiting resistor of 400X nominal value A block diagram is shown in Figure 1 Figure 4 shows the input data format Bit ‘‘1’’ is the first bit into the data input pin and it will appear on pin 17 A logical ‘‘1’’ at the input will turn on the appropriate LED The load signal latches the 33 bits of the shift register into the latch- es The data out pin allows for cascading the shift registers for more than 33 output drivers When the chip first powers ON an internal power ON reset signal is generated which resets all registers and latches The leading clock returns the chip to its normal operation Figure 3 shows the timing relationship between data clock and data enable A maximum clock frequency of 05 MHz is assumed 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 TJ e (VOUT)(ILED) (No of segments) (iJA) a TA where TJ e junction temperature 150 C max VOUT e the voltage at the LED driver outputs ILED e the LED current iJA e thermal coefficient of the package TA e ambient temperature iJA (Socket Mount) e 54 CW iJA (Board Mount) e 49 CW The above equation was used to plot Figure 6 Figure 7 and Figure 8 TLF6142 – 3 FIGURE 3 TLF6142 – 4 This leading clock is necessary only after power ON FIGURE 4 Input Data Format TLF6142 – 5 FIGURE 5 3 |
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Similar Description - MM5486N |
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