AD7147(Rev0) データシートの表示（PDF） - Analog Devices

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AD7147
(Rev.:Rev0)

CapTouch™ Programmable Controller for Single-Electrode Capacitance Sensors

Analog Devices 

AD7147

CDC CONVERSION

SEQUENCE

(INTERNAL)

PROXIMITY

DETECTION

(INTERNAL)

USER APPROACHES

SENSOR

USER LEAVES

SENSOR AREA

16

tCALDIS

MEASURED CDC VALUE > STORED AMBIENT

BY PROXIMITY_RECAL _LVL

tRECAL

30

70

tCONV_FP

CALIBRATION

(INTERNAL)

CALIBRATION DISABLED

RECALIBRATION TIMEOUT

CALIBRATION ENABLED

RECALIBRATION

COUNTER

(INTERNAL)

tRECAL_TIMEOUT

NOTES

1. SEQUENCE CONVERSION TIME tCONV_FP (SEE TABLE 10).

2. tCALDIS = tCONV_FP × FP_PROXIMITY_CNT × 16.

3. tRECAL_TIMEOUT = tCONV_FP × FP_PROXIMITY_RECAL.

4. tRECAL = 2 × tCONV_FP.

Figure 31. Example of Full Power Mode Proximity Detection with Forced Recalibration (FP_PROXIMITY_CNT = 1 and FP_PROXIMITY_RECAL = 40)

CDC CONVERSION

SEQUENCE

(INTERNAL)

PROXIMITY

DETECTION

(INTERNAL)

USER APPROACHES

SENSOR

USER LEAVES

SENSOR AREA

16

tCALDIS

MEASURED CDC VALUE > STORED AMBIENT

BY PROXIMITY_RECAL _LVL

tRECAL

30

70

tCONV_LP

CALIBRATION

(INTERNAL)

RECALIBRATION

(INTERNAL)

CALIBRATION DISABLED

RECALIBRATION TIMEOUT

tRECAL_TIMEOUT

CALIBRATION ENABLED

NOTES

1. SEQUENCE CONVERSION TIME tCONV_LP = tCONV_FP + LP_CONV_DELAY.

2. tCALDIS = tCONV_LP × LP_PROXIMITY_CNT × 4.

3. tRECAL_TIMEOUT = tCONV_LP × LP_PROXIMITY_RECAL.

4. tRECAL = 2 × tCONV_LP.

Figure 32. Example of Low Power Mode Proximity Detection with Forced Recalibration (LP_PROXIMITY_CNT = 4 and LP_PROXIMITY_RECAL = 40)

Rev. 0 | Page 20 of 68

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