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AD7142 датащи(PDF) 23 Page - Analog Devices

номер детали AD7142
подробное описание детали  Programmable Capacitance-to-Digital Converter with Environmental Compensation
PDF  68 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD7142 датащи(HTML) 23 Page - Analog Devices

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AD7142
Rev. 0 | Page 23 of 68
CAPACITANCE SENSOR BEHAVIOR WITH
CALIBRATION
The AD7142 on-chip adaptive calibration algorithm prevents
sensor detection errors such as the one shown in Figure 32. This
is achieved by monitoring the CDC ambient levels and
internally adjusting the initial offset level register values
according to the amount of ambient drift measured on each
sensor. This closed loop routine ensures the reliability and
repeatable operation of every sensor connected to the AD7142
under dynamic environmental conditions. Figure 33 shows a
simplified example of how the AD7142 applies the adaptive
calibration process resulting in no interrupt errors under
changing CDC ambient levels due to environmental conditions.
t
SENSOR 1 INT
ASSERTED
1
2
3
4
5
6
STAGE_HIGH_THRESHOLD
(POST CALIBRATED
REGISTER VALUE)
CHANGING ENVIRONMENTAL CONDITIONS
NOTES
1. INITIAL STAGE_OFFSET_HIGH REGISTER VALUE
2. POST CALIBRATED REGISTER STAGE_HIGH_THRESHOLD
3. POST CALIBRATED REGISTER STAGE_HIGH_THRESHOLD
4. INITIAL STAGE_LOW_THRESHOLD
5. POST CALIBRATED REGISTER STAGE_LOW_THRESHOLD
6. POST CALIBRATED REGISTER STAGE_LOW_THRESHOLD
CDCAMBIENT
VALUE DRIFTING
STAGE_LOW_THRESHOLD
(POST CALIBRATED
REGISTER VALUE)
SENSOR 2 INT
ASSERTED
Figure 33. Typical Sensor Behavior with Calibration Applied on the Data Path



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