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AD7142 датащи(PDF) 18 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) 18 Page - Analog Devices

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AD7142
Rev. 0 | Page 18 of 68
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) + LP_CONV_DELAY
CALIBRATION ENABLED
CALIBRATION DISABLED
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
tCALDIS
tCONV_LP
12 3 4 56 7 8 9 10 11 1213 14 15 16
CDC CONVERSION SEQUENCE
(INTERNAL)
USER LEAVES SENSOR
AREA HERE
USER APPROACHES
SENSOR HERE
Figure 27. Low Power Mode Proximity Detection with LP_PROXIMITY = 4 and LP_CONV_DELAY = 0
CALIBRATION ENABLED
CALIBRATION DISABLED
tDISCAL
tRECAL
16
30
70
tCONV_FP
USER IN CONTACT WITH SENSOR
CDC CONVERSION VALUES EXCEED
PROXIMITY_RECALIBRATION _LVL
RECALIBRATION PERIOD
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
CDC CONVERSION SEQUENCE
(INTERNAL)
RECALIBRATION
(INTERNAL)
NOTES
1. SEQUENCE CONVERSION TIME
tCONV_FP DETERMINED FROM TABLE 10
2.
tDISCAL = tCONV_FP × FP_PROXIMITY_CNT
3.
tRECAL = tCONV_FP × FP_PROXIMITY_RECAL
USER APPROACHES
SENSOR HERE
USER LEAVES SENSOR
AREA HERE
Figure 28. Full Power Mode Proximity Detection with Forced Recalibration Example with FP_PROXIMITY = 1 and FP_PROXIMITY_RECAL = 40



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