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AD7142 Datasheet(PDF) 19 Page - Analog Devices

Part # AD7142
Description  Programmable Controller for Capacitance Touch Sensors
PDF  70 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7142 Datasheet(HTML) 19 Page - Analog Devices

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Data Sheet
AD7142
Rev. B | Page 19 of 70
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
1 2 3 4 5 6 7 8 9 10 11 1213 14 15 16
CDC CONVERSION SEQUENCE
(INTERNAL)
CALIBRATION ENABLED
CALIBRATION DISABLED
tCONV_FP
USER LEAVES SENSOR
AREA HERE
USER APPROACHES
SENSOR HERE
tCALDIS
Figure 28. Full Power Mode Proximity Detection Example with FP_PROXIMITY_CNT = 1
NOTES
1. SEQUENCE CONVERSION TIME
tCONV_LP = tCONV_FP + LP_CONV_DELAY
2. PROXIMITY IS SET WHEN USER APPROACHES THE SENSOR AT WHICH TIME THE INTERNAL CALIBRATION IS DISABLED.
3.
tCALDIS = (tCONV_LP × LP_PROXIMITY_CNT × 4)
CALIBRATION ENABLED
CALIBRATION DISABLED
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
tCALDIS
tCONV_LP
1 2 3 4 5 6 7 8 9 10 11 1213 14 15 16
CDC CONVERSION SEQUENCE
(INTERNAL)
USER LEAVES
SENSOR
AREA HERE
USER
APPROACHES
SENSOR HERE
1718 19 20 21 2223 24
Figure 29. Low Power Mode Proximity Detection with LP_PROXIMITY_CNT = 4
CALIBRATION ENABLED
tRECAL_TIMEOUT
16
30
70
tCONV_FP
MEASURED CDC VALUE > STORED AMBIENT
BY PROXIMITY_RECAL _LVL
RECALIBRATION TIME-OUT
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
CDC CONVERSION SEQUENCE
(INTERNAL)
RECALIBRATION COUNTER
(INTERNAL)
NOTES
1. SEQUENCE CONVERSION TIME
tCONV_FP DETERMINED FROM TABLE 10
2.
tCALDIS = tCONV_FP × FP_PROXIMITY_CNT ×16
3.
tRECAL_TIMEOUT = tCONV_FP × FP_PROXIMITY_RECAL
4.
tRECAL = 2 × tCONV_FP
USER APPROACHES
SENSOR HERE
USER LEAVES SENSOR
AREA HERE
tCALDIS
tRECAL
CALIBRATION DISABLED
Figure 30. Full Power Mode Proximity Detection with Forced Recalibration Example with FP_PROXIMITY_CNT = 1 and FP_PROXIMITY_RECAL = 40



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