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AD7142 Datenblatt(PDF) 20 Page - Analog Devices

Teilenummer AD7142
Bauteilbeschribung  Programmable Controller for Capacitance Touch Sensors
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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AD7142 Datenblatt(HTML) 20 Page - Analog Devices

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AD7142
Data Sheet
Rev. B | Page 20 of 70
NOTES
1. SEQUENCE CONVERSION TIME
tCONV_LP = tCONV_FP + LP_CONV_DELAY
2.
tCALDIS = tCONV_LP × LP_PROXIMITY_CNT × 4
3.
tRECAL_TIMEOUT = tCONV_FP × LP_PROXIMITY_RECAL
4.
tRECAL = 2 × tCONV_LP
CALIBRATION ENABLED
tRECAL_TIMEOUT
16
30
70
tCONV_LP
RECALIBRATION TIME-OUT
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
CDC CONVERSION SEQUENCE
(INTERNAL)
RECALIBRATION
(INTERNAL)
USER APPROACHES
SENSOR HERE
USER LEAVES SENSOR
AREA HERE
MEASURED CDC VALUE > STORED AMBIENT
BY PROXIMITY_RECAL _LVL
tRECAL
tCALDIS
CALIBRATION DISABLED
Figure 31. Low Power Mode Proximity Detection with Forced Recalibration Example with LP_PROXIMITY_CNT = 4 and LP_PROXIMITY_RECAL = 40


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