EVAL-AD7142EB View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

EVAL-AD7142EB

Programmable Capacitance-to-Digital Converter with Environmental Compensation

Analog Devices 

USER APPROACHES

SENSOR HERE

USER LEAVES SENSOR

AREA HERE

CDC CONVERSION SEQUENCE

(INTERNAL)

PROXIMITY DETECTION

(INTERNAL)

USER IN CONTACT WITH SENSOR

CDC CONVERSION VALUES EXCEED

PROXIMITY_RECALIBRATION _LVL

16

30

70

tDISCAL

AD7142

tCONV_LP

CALIBRATION

(INTERNAL)

RECALIBRATION

(INTERNAL)

CALIBRATION DISABLED

RECALIBRATION PERIOD

tRECAL

CALIBRATION ENABLED

NOTES

1. SEQUENCE CONVERSION TIME tCONV_LP = tCONV_HP + LP_CONV_DELAY

2. tDISCAL = tCONV_LP × (16 × LP_PROXIMITY_CNT)

3. tRECAL = tCONV_LP × (LP_PROXIMITY_RECAL × 4)

Figure 29. Low Power Mode Proximity Detection with Forced Recalibration Example with LP_PROXIMITY = 4 and LP_PROXIMITY_RECAL = 10

Rev. 0 | Page 19 of 68

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