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AD7147 Datasheet(PDF) 17 Page - Analog Devices

Part # AD7147
Description  CapTouch Programmable Controller for Single-Electrode Capacitance Sensors
PDF  73 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7147 Datasheet(HTML) 17 Page - Analog Devices

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AD7147
Data Sheet
Rev. D | Page 16 of 72
A button sensor generally requires one sequencer stage; this is
shown in Figure 26 as B1. However, it is possible to configure
two button sensors to operate differentially for one conversion
stage. Only one button can be activated at a time; pressing both
buttons simultaneously results in neither button being activated.
The configuration with two button sensors operating differentially
requires one conversion stage and is shown in Figure 26, with
B2 and B3 representing the differentially configured button sensors.
A wheel sensor requires eight stages, whereas a slider requires two
stages. The result from each stage is used by the host software to
determine the user’s position on the slider or wheel. The algorithms
that perform this process are available from Analog Devices and are
free of charge, but require signing a software license.
STAGE11
STAGE10
STAGE9
STAGE8
STAGE7
STAGE6
STAGE5
STAGE4
STAGE3
STAGE2
STAGE1
STAGE0
Σ-∆
16-BIT
ADC
CIN0
CIN1
CIN2
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
CIN10
CIN11
CIN12
Figure 25. CDC Conversion Stages
CDC
STAGE0
+
–
STAGE1
+
–
CDC
AD7147
SEQUENCER
CDC
STAGE2
+
–
STAGE3
+
–CDC
CDC
STAGE4
+
–
STAGE5
+
–CDC
CDC
STAGE6
+
–
STAGE7
+
–CDC
SCROLL
WHEEL
BUTTONS
STAGE8
CDC
+
–
STAGE9
CDC
+
–
AD7147
SEQUENCER
B1
B2
B3
STAGE10
CDC
+
–
STAGE11
CDC
+
–
AD7147
SEQUENCER
SLIDER
Figure 26. Sequencer Setup for Sensors



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