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SX1512BIULTRT Datasheet(PDF) 22 Page - Semtech Corporation

Part No. SX1512BIULTRT
Description  World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SX1512BIULTRT Datasheet(HTML) 22 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
Rev 3 – 9
th Sept. 2010
22
www.semtech.com
SX1510B/SX1511B/SX1512B
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
14
1
46
7
78
19
110
38
142
65
174
104
206
157
238
225
15
1
47
7
79
19
111
38
143
65
175
104
207
157
239
225
16
2
48
8
80
20
112
39
144
69
176
110
208
165
240
235
17
2
49
8
81
20
113
39
145
69
177
110
209
165
241
235
18
2
50
8
82
21
114
41
146
69
178
110
210
165
242
235
19
2
51
8
83
21
115
41
147
69
179
110
211
165
243
235
20
2
52
9
84
22
116
42
148
73
180
116
212
172
244
245
21
2
53
9
85
22
117
42
149
73
181
116
213
172
245
245
22
2
54
9
86
23
118
44
150
73
182
116
214
172
246
245
23
2
55
9
87
23
119
44
151
73
183
116
215
172
247
245
24
3
56
10
88
24
120
46
152
78
184
122
216
181
248
255
25
3
57
10
89
24
121
46
153
78
185
122
217
181
249
255
26
3
58
10
90
25
122
46
154
78
186
122
218
181
250
255
27
3
59
10
91
25
123
46
155
78
187
122
219
181
251
255
28
3
60
11
92
26
124
49
156
83
188
129
220
189
252
255
29
3
61
11
93
26
125
49
157
83
189
129
221
189
253
255
30
3
62
12
94
27
126
49
158
83
190
129
222
189
254
255
31
3
63
12
95
27
127
49
159
83
191
129
223
189
255
255
Table 7 – LED Driver Linear vs Logarithmic Function (I)
0
50
100
150
200
250
300
1
10
19
28
37
46
55
64
73
82
91 100 109 118 127 136 145 154 163 172 181 190 199 208 217 226 235 244 253
RegIOn (4xRegOff[2:0])
Linear mode
Log mode
Figure 19 – LED Driver Linear vs Logarithmic Function (II)
4.9.6
Synchronization of LED Drivers across several ICs
When several GPIO expanders are used in the same application it may be useful that their LEDs drivers are
synchronous for coherent global operation.
In this case all ICs should share their fOSC through their OSCIO pins and have their reset connected together.
When RegMisc of each IC is set accordingly, NRESET signal can then be used to reset all devices’ internal
counters (but not the register settings) and allow synchronous LED operation (blinking, fading) across multiple
devices.
4.9.7
Tutorial
Below are the steps required to use the LED driver with the typical LED connection described §6.2:
-
Disable input buffer (RegInputDisable)
-
Disable pull-up (RegPullUp)
-
Enable open drain (RegOpenDrain)


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