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AD7142 Datasheet

  • AD7142

  • Programmable Capacitance-to-Digital Converter with Environme...

  • 66頁

  • AD

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AD7142
USER APPROACHES
SENSOR HERE
USER LEAVES SENSOR
AREA HERE
t
CONV_LP
CDC CONVERSION SEQUENCE
(INTERNAL)
1 2 3 4 5 6 7 8 9 10 11 1213 14 15 16
t
CALDIS
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
CALIBRATION DISABLED
CALIBRATION ENABLED
Figure 27. Low Power Mode Proximity Detection with LP_PROXIMITY = 4 and LP_CONV_DELAY = 0
USER APPROACHES
SENSOR HERE
USER LEAVES SENSOR
AREA HERE
CDC CONVERSION VALUES EXCEED
PROXIMITY_RECALIBRATION _LVL
USER IN CONTACT WITH SENSOR
16
CDC CONVERSION SEQUENCE
(INTERNAL)
30
70
t
CONV_FP
t
DISCA L
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
CALIBRATION DISABLED
RECALIBRATION PERIOD
CALIBRATION ENABLED
NOTES
1. SEQUENCE CONVERSION TIME
t
CONV_FP
DETERMINED FROM TABLE 10
2.
t
DISCAL
=
t
CONV_FP
脳 FP_PROXIMITY_CNT
3.
t
RECAL
=
t
CONV_FP
脳 FP_PROXIMITY_RECAL
Figure 28. Full Power Mode Proximity Detection with Forced Recalibration Example with FP_PROXIMITY = 1 and FP_PROXIMITY_RECAL = 40
Rev. 0 | Page 18 of 68
05702-019
RECALIBRATION
(INTERNAL)
t
RECAL
05702-018
NOTES
1. SEQUENCE CONVERSION TIME
t
CONV_LP
=
t
CONV_FP
+ LP_CONV_DELAY
2. PROXIMITY IS SET WHEN USER APPROACHES THE SENSOR AT WHICH TIME THE INTERNAL CALIBRATION IS DISABLED.
3.
t
CALDIS
= (
t
CONV_LP
脳 LP_PROXIMITY_CNT 脳 4) + LP_CONV_DELAY

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