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M5482 Datasheet(PDF) 4 Page - STMicroelectronics

Part # M5482
Description  LED DISPLAY DRIVER
Download  10 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M5482 Datasheet(HTML) 4 Page - STMicroelectronics

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Figure 4. Input Data Format
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 configurations. There is no clear for
the master portion of the first shift register, thus al-
lowing continuous operation.
There must be a complete set of 36 clocks or the
shift registers will not clear.
When power is first applied to the chip an internal
power ON reset signal is generated which resets
all registers and all latches. The START bit and the
first clock return the chip to its normal operation.
Figure 5 shows the timing relationships between
Data and Clock.
A maximum clock frequency of 0.5 MHz is as-
sumed.
Table 3 shows the Output Data Format for the
M5482. Because it uses only 15 of the possible 35
outputs, 20 of the bits are "Don’t Cares".
For applications where a lesser number of outputs
are used it is possible to either increase the cur-
rent per output or operate the part at higher than
1V VOUT.
The following equation can be used for calcula-
tions.
Tj … [(VOUT)(ILED)(no.of segments) + VDD . 7 mA]
(80 °C/W) + Tamb
where:
Tj ≡ junction temperature (150 °C max)
VOUT = the voltage at the LED driver outputs
ILED = the LED current
80 °C/W = thermal coefficient of the package
Tamb = ambient temperature
Figure 5.
Table 3. Serial Data Bus / Outputs Correspondence
36
BIT 34
BIT 35
CLOCK
DATA
LOAD
(INTERNAL)
RESET
(INTERNAL)
START
BIT 1
1
CLOCK
DATA
300ns (min.)
5451
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
START
5482
15
XXX
X
14
13
XX
XX
12
11
10
9
XX
X
START
5451
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
START
5482
X
8
7
6
5
XXX
X
4
3
2
1
X
XXX
START


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