参数资料
型号: SX1508IULTRT
厂商: Semtech
文件页数: 13/41页
文件大小: 0K
描述: IC GPIO EXPANDER I2C 8CH 20QFN
特色产品: SX1508/SX1509 GPIO Expanders
标准包装: 1
接口: I²C
输入/输出数: 8
中断输出:
频率 - 时钟: 400kHz
电源电压: 1.2 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-UFQFN 裸露焊盘
供应商设备封装: 20-QFN-UT(3x3)
包装: 标准包装
包括: LED 驱动器 / 小键盘引擎
其它名称: SX1508IULDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 30
th Oct. 2009
20
www.semtech.com
SX1507/SX1508/SX1509
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
4.9.3
Single Shot Mode
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.
IOLED(X) level
On intensity(max)
Off intensity(min)
RegData(X)
Fade in rate determined by
register RegTRiseX
Minimum intensity duration
determined by register
RegData(x)
Fade out rate determined
by register RegTFallX
Figure 17 – LED Driver Single Shot Mode
4.9.4
Blink Mode
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.
Off intensity(min)
RegData(X)
IOLED(X) level
Fade in rate determined by
register RegTRiseX
Minimum intensity duration
determined by register
RegTOffX
Maximum intensity
duration determined by
register RegTOnX
Fade out rate determined
by register RegTFallX
When RegData(X) is cleared, the LED
will complete any current ramp, and then
stay at minimum intensity
On intensity(max)
Figure 18 – LED Driver Blink Mode
4.9.5
LED Driver Modes
For each IO bank, the LED driver mode of fading capable IOs can be selected between linear or logarithmic in
RegMisc.
Lin.
Log.
Lin.
Log.
Lin.
Log.
Lin.
Log.
Lin.
Log.
Lin.
Log.
Lin.
Log.
Lin.
Log.
0
32
4
64
13
96
28
128
53
160
88
192
135
224
198
1
0
33
4
65
13
97
28
129
53
161
88
193
135
225
198
2
0
34
4
66
13
98
30
130
53
162
88
194
135
226
198
3
0
35
4
67
13
99
30
131
53
163
88
195
135
227
198
4
0
36
5
68
14
100
31
132
56
164
93
196
142
228
207
5
0
37
5
69
14
101
31
133
56
165
93
197
142
229
207
6
0
38
5
70
14
102
32
134
56
166
93
198
142
230
207
7
0
39
5
71
14
103
32
135
56
167
93
199
142
231
207
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