SX1508EVK Semtech, SX1508EVK Datasheet - Page 20

• Manufacturer Part Number: SX1508EVK
• Description: Evaluation Board For SX1508
• Manufacturer: Semtech

ADVANCED COMMUNICATIONS & SENSING
4.9.3
Invoked when TOnX != 0 and TOffX = 0.
If the I/O doesn’t support fading the LED intensity will step directly to the IOnX/IOffX value.
4.9.4
Invoked when TOnX != 0 and TOffX != 0.
If the I/O doesn’t support fading the LED intensity will step directly to the IOnX/IOffX value.
4.9.5
For each IO bank, the LED driver mode of fading capable IOs can be selected between linear or logarithmic in
RegMisc.
Rev 1 – 30
Lin.
0
1
2
3
4
5
6
7
RegData(X)
IOLED(X) level
Log.
Single Shot Mode
Blink Mode
LED Driver Modes
0
0
0
0
0
0
0
0
RegData(X)
IOLED(X) level
th
Off intensity(min)
Oct. 2009
Fade in rate determined by
Lin.
32
33
34
35
36
37
38
39
register RegTRiseX
Fade out rate determined
by register RegTFallX
Off intensity(min)
Fade in rate determined by
Log.
register RegTRiseX
On intensity(max)
Fade out rate determined
4
4
4
4
5
5
5
5
by register RegTFallX
Lin.
64
65
66
67
68
69
70
71
On intensity(max)
Figure 17 – LED Driver Single Shot Mode
Log.
13
13
13
13
14
14
14
14
Figure 18 – LED Driver Blink Mode
Minimum intensity duration
determined by register
Lin.
100
101
102
103
96
97
98
99
RegTOffX
Log.
28
28
30
30
31
31
32
32
Minimum intensity duration
20
determined by register
Lin.
128
129
130
131
132
133
134
135
RegData(x)
Log.
duration determined by
World’s Lowest Voltage Level Shifting GPIO
53
53
53
53
56
56
56
56
Maximum intensity
register RegTOnX
will complete any current ramp, and then
Lin.
160
161
162
163
164
165
166
167
When RegData(X) is cleared, the LED
with LED Driver and Keypad Engine
SX1507/SX1508/SX1509
stay at minimum intensity
Log.
88
88
88
88
93
93
93
93
Lin.
192
193
194
195
196
197
198
199
Log.
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135
135
135
135
142
142
142
142
Lin.
224
225
226
227
228
229
230
231
Log.
198
198
198
198
207
207
207
207