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Programming Examples
The example in Table 10 and Figure 12 illustrates the
relationship between the default register contents and the
pattern of the IC in PLAY mode. BOLD signifies the decimal
values of the controlling registers.
Table 10. PULSE1 Default Example (see Table 2 and
Table 9)
t FALL1 = t RISE1 = 31 ? 5 ? 3.33 ms = 516 ms
t ON1 = 5 ? 106.6 ms =533 ms
t OFF1 = 5 ? 320 ms =1600 ms
The example in Table 11 and Figure 13 illustrates a long-
duration pulse followed by a short-duration pulse with two
seconds between each pulse; with rise and fall times of each
using default values.
Table 11. Long-Short Pattern Example (see Figure 13)
t FALL1 = t RISE1 = 31 ? 5 ? 3.33 ms = 516 ms
t ON1 = 10 ? 106.6 ms =1066 ms
t OFF1 = 9 ? 320 ms =2880 ms
t FALL2 = t RISE2 = 31 ? 1 ? 3.33 ms = 103 ms
Register
SLEW1 PULSE1
SLEW2
PULSE2
CONTROL
t ON2 = 2 ? 106.6 ms =213 ms
Value
(HEX)
55
55
00
00
02
t OFF2 = 5 ? 320 ms =1600 ms
Register
SLEW1 PULSE1 SLEW2
PULSE2
CONTROL
516ms
533ms
516ms
1600ms
Value
(HEX)
55
A9
11
25
02
PULSE1
Figure 12. PULSE1 Default LED Current Pattern for
Register in Table 10
516ms
1066ms
516ms
2880ms
103ms
213ms
103ms
1600ms
PULSE1
PULSE2
PULSE1
Figure 13. LED Current Waveform for Register Settings in Table 11
? 2009 Fairchild Semiconductor Corporation
FAN5646 ? Rev. 1.0. 3
9
www.fairchildsemi.com
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