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AD7143 Datasheet(PDF) 19 Page - Analog Devices

Part # AD7143
Description  Programmable Controller for Capacitance Touch Sensors
PDF  57 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7143 Datasheet(HTML) 19 Page - Analog Devices

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AD7143
Rev. 0 | Page 18 of 56
CALIBRATION ENABLED
CALIBRATION DISABLED
PROXIMITY
DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
12 3456789 10 11 12 13 14 15 16
CDC CONVERSION
SEQUENCE
(INTERNAL)
USER LEAVES SENSOR
AREA HERE
USER APPROACHES
SENSOR HERE
17 18 19 20 21 22 23 24
tCONV_FP
tCALDIS
Figure 27. 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
12 3456789 10 11 12 13 14 15 16
CDC CONVERSION
SEQUENCE
(INTERNAL)
USER LEAVES SENSOR
AREA HERE
USER APPROACHES
SENSOR HERE
17 18 19 20 21 22 23 24
Figure 28. Low Power Mode Proximity Detection with LP_PROXIMITY_CNT = 4 and LP_CONV_DELAY = 0
CALIBRATION ENABLED
tRECAL_TIMEOUT
16
30
70
tCONV_FP
MEASURED CDC VALUE > STORED AMBIENT
BY PROXIMITY_RECAL _LVL
RECALIBRATION TIMEOUT
PROXIMITY
DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
CDC CONVERSION
SEQUENCE
(INTERNAL)
RECALIBRATION
COUNTER
(INTERNAL)
USER APPROACHES
SENSOR HERE
USER LEAVES SENSOR
AREA HERE
tCALDIS
tRECAL
CALIBRATION DISABLED
NOTES
1.
tCALDIS = tCONV_FP × FP_PROXIMITY_CNT × 16.
2.
tRECAL_TIMEOUT = tCONV_FP × FP_PROXIMITY_RECAL.
3.
tRECAL = 2 × tCONV_FP.
Figure 29. Full Power Mode Proximity Detection with Forced Recalibration Example with FP_PROXIMIT_CNT = 1 and FP_PROXIMITY_RECAL = 40
Note that in Figure 29, the sequence conversion time, tCONV_FP, is determined from Table 8.



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