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MM58241 Scheda tecnica(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte MM58241
Spiegazioni elettronici  MM58241 High Voltage Display Driver
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

MM58241 Scheda tecnica(HTML) 4 Page - National Semiconductor (TI)

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Functional Description (Continued)
Figure 4 demonstrates the critical timing requirements be-
tween CLOCK and DATA IN for the MM58241
To clear (reset) the display driver at power on or any time
the following flushing routine may be used With the enable
signal high clock in 32 zeroes Drive the enable signal low
and the display will be blank It is recommended to clear the
driver at power on
In
Figure 5 the ENABLE signal acts as an envelope and
only while this signal is at a logic ‘1’ does the circuit accept
CLOCK input signals Data is transferred and shifted in the
internal shift register on the rising clock edge ie
‘0’ – ‘1’
transition When the ENABLE signal goes low the contents
of the shift registers are latched and the display will show
new data During data transfer the display will show old
data DATA OUT is also provided on the MM58241 being
output on the falling edge At any time the display may be
blanked under processor control using the BLANKING
CONTROL input
Figure 6 shows a schematic diagram of a microprocessor-
based system where the MM58241 is used to provide the
grid drive for a 32-digit5x7dot matrix vaccum fluorescent
(VF) display The anode drive in this example is provided by
another member of the high voltage display driver family
namely the MM58248 which does not require an externally
generated load signal
TLF5600 – 3
FIGURE 3a Output Impedance Off
TLF5600 – 4
FIGURE 3b Output Impedance On
Timing Diagrams
TLF5600 – 5
For the purposes of AC measurements VIH e 24V VIL e 08V
FIGURE 4 Clock and Data Timings
4


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