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MM5486N Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # MM5486N
Description  LED Display Driver
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

MM5486N Datasheet(HTML) 3 Page - National Semiconductor (TI)

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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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