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SX8661 Datasheet(PDF) 19 Page - Semtech Corporation

Part # SX8661
Description  Low Power, Capacitive Button Touch and Proximity Controller
PDF  88 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SX8661 Datasheet(HTML) 19 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Revision v3.2, January 2011
© 2011 Semtech Corp.
www.semtech.com
19
SX8661
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
3.8
Analog Output Interface
The Analog Output Interface outputs a PWM signal with a varying duty cycle depending on which button is
touched. By filtering (with a simple RC filter) the PWM signal results in a DC voltage, different for each button
touch. The host controller measures the DC voltage level and determines which buttons has been touched.
In the case of single button touches, each button produces its own voltage level as configured by the user (see
5.6 and
Table 8).
Figure 13 show how the AOI will behave when the user touches and releases different buttons.
The AOI will switch between the AOI idle level and the level for each button.
Figure 13
AOI behavior
The PWM blocks used in AOI modes are 8-bits based and clocked at 2MHz typically.
The PWM period can be set to 256 (default) or 64. The 256 period offers a better granularity at a lower frequency,
while the 64 period is faster and with fewer steps.
Figure 14 shows the PWM definition of the AOI.
Figure 14
PWM definition, (a) small pulse width, (b) large pulse width
Table 8 describes the AOI level index versus the PWM pulse width. The user can select 256 steps (index) in case
the period is set to 255.
In case the period is set to 64 then the index from 0 to 63 applies.
Index
Width
Index
Width
Index
Width
Index
Width
Index
Width
Index
Width
Index
Width
Index
Width
0
0
32
33
64
65
96
97
128
129
160
161
192
193
224
225
1
2
33
34
65
66
97
98
129
130
161
162
193
194
225
226
2
3
34
35
66
67
98
99
130
131
162
163
194
195
226
227
3
4
35
36
67
68
99
100
131
132
163
164
195
196
227
228
4
5
36
37
68
69
100
101
132
133
164
165
196
197
228
229
5
6
37
38
69
70
101
102
133
134
165
166
197
198
229
230
6
7
38
39
70
71
102
103
134
135
166
167
198
199
230
231
7
8
39
40
71
72
103
104
135
136
167
168
199
200
231
232
8
9
40
41
72
73
104
105
136
137
168
169
200
201
232
233
9
10
41
42
73
74
105
106
137
138
169
170
201
202
233
234
10
11
42
43
74
75
106
107
138
139
170
171
202
203
234
235
11
12
43
44
75
76
107
108
139
140
171
172
203
204
235
236
12
13
44
45
76
77
108
109
140
141
172
173
204
205
236
237
13
14
45
46
77
78
109
110
141
142
173
174
205
206
237
238
14
15
46
47
78
79
110
111
142
143
174
175
206
207
238
239



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