th Oct. 2009 21 www.semtech.com SX1507/SX1508/SX1509 W" />
參數(shù)資料
型號: SX1508IULTRT
廠商: Semtech
文件頁數(shù): 14/41頁
文件大?。?/td> 0K
描述: IC GPIO EXPANDER I2C 8CH 20QFN
特色產(chǎn)品: SX1508/SX1509 GPIO Expanders
標(biāo)準(zhǔn)包裝: 1
接口: I²C
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時鐘: 400kHz
電源電壓: 1.2 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-UFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 20-QFN-UT(3x3)
包裝: 標(biāo)準(zhǔn)包裝
包括: LED 驅(qū)動器 / 小鍵盤引擎
其它名稱: SX1508IULDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 30
th Oct. 2009
21
www.semtech.com
SX1507/SX1508/SX1509
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
8
1
40
6
72
16
104
34
136
60
168
98
200
150
232
216
9
1
41
6
73
16
105
34
137
60
169
98
201
150
233
216
10
1
42
6
74
17
106
35
138
60
170
98
202
150
234
216
11
1
43
6
75
17
107
35
139
60
171
98
203
150
235
216
12
1
44
7
76
18
108
36
140
65
172
104
204
157
236
225
13
1
45
7
77
18
109
36
141
65
173
104
205
157
237
225
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
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
Table 8 – 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])
IO
n
(I
O
ff
)
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 NRESET pins 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.
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