sx1508bevk Semtech Corporation, sx1508bevk Datasheet - Page 20

• Manufacturer Part Number: sx1508bevk
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
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 3 – 9
Lin.
10
11
12
0
1
2
3
4
5
6
7
8
9
RegData(X)
IOLED(X) level
Log.
Blink Mode
LED Driver Modes
0
0
0
0
0
0
0
0
1
1
1
1
1
th
RegData(X)
IOLED(X) level
Sept. 2010
Off intensity(min)
Fade in rate determined by
Lin.
32
33
34
35
36
37
38
39
40
41
42
43
44
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
6
6
6
6
7
by register RegTFallX
Lin.
64
65
66
67
68
69
70
71
72
73
74
75
76
On intensity(max)
Figure 18 – LED Driver Single Shot Mode
Log.
13
13
13
13
14
14
14
14
16
16
17
17
18
Figure 19 – LED Driver Blink Mode
Minimum intensity duration
determined by register
Lin.
100
101
102
103
104
105
106
107
108
96
97
98
99
RegTOffX
Log.
28
28
30
30
31
31
32
32
34
34
35
35
36
Minimum intensity duration
20
determined by register
Lin.
128
129
130
131
132
133
134
135
136
137
138
139
140
RegData(x)
Log.
duration determined by
World’s Lowest Voltage Level Shifting GPIO
53
53
53
53
56
56
56
56
60
60
60
60
65
Maximum intensity
register RegTOnX
SX1507B/SX1508B/SX1509B
will complete any current ramp, and then
Lin.
160
161
162
163
164
165
166
167
168
169
170
171
172
When RegData(X) is cleared, the LED
with LED Driver and Keypad Engine
stay at minimum intensity
Log.
104
88
88
88
88
93
93
93
93
98
98
98
98
Lin.
192
193
194
195
196
197
198
199
200
201
202
203
204
Log.
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135
135
135
135
142
142
142
142
150
150
150
150
157
Lin.
224
225
226
227
228
229
230
231
232
233
234
235
236
Log.
198
198
198
198
207
207
207
207
216
216
216
216
225