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AD7148 Datasheet(PDF) 19 Page - Analog Devices

Part # AD7148
Description  Programmable Touch Controller for Single Electrode Capacitance Sensors
PDF  56 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7148 Datasheet(HTML) 19 Page - Analog Devices

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AD7148
Rev. 0 | Page 19 of 56
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 29. Low Power Mode Proximity Detection with Forced Recalibration Example with LP_PROXIMITY_CNT = 4 and LP_PROXIMITY_RECAL = 40



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