AD7147 datasheet(21/71 Pages) AD

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AD7147

Data Sheet

Table 12. Proximity Control Registers (See Figure 34)

Bit Name

Length

(Bits)

Description

FP_PROXIMITY_CNT

0x002[7:4]

Calibration disable time in full power mode.

LP_PROXIMITY_CNT

0x002[11:8]

Calibration disable time in low power mode.

FP_PROXIMITY_RECAL

0x004[9:0]

Full power mode proximity recalibration time.

LP_PROXIMITY_RECAL

0x004[15:10]

Low power mode proximity recalibration time.

PROXIMITY_RECAL_LVL

0x003[7:0]

Proximity recalibration level. This value multiplied by 16 controls the

sensitivity of Comparator 2 (see Figure 34).

PROXIMITY_DETECTION_RATE

0x003[13:8]

Proximity detection rate. This value multiplied by 16 controls the

sensitivity of Comparator 1 (see Figure 34).

CALIBRATION ENABLED

CALIBRATION DISABLED

PROXIMITY

DETECTION

(INTERNAL)

CALIBRATION

(INTERNAL)

9 10 11 12 13 14 15 16

CDC CONVERSION

SEQUENCE

(INTERNAL)

USER LEAVES

SENSOR AREA

USER APPROACHES

SENSOR

17 18 19 20 21 22 23 24

tCONV_FP

tCALDIS

Figure 30. Example of Full Power Mode Proximity Detection (FP_PROXIMITY_CNT = 1)

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.

tCALDIS = (tCONV_LP × LP_PROXIMITY_CNT × 4).

CALIBRATION ENABLED

CALIBRATION DISABLED

PROXIMITY

DETECTION

(INTERNAL)

CALIBRATION

(INTERNAL)

tCALDIS

tCONV_LP

9 10 11 12 13 14 15 16

CDC CONVERSION

SEQUENCE

(INTERNAL)

USER LEAVES

SENSOR AREA

USER APPROACHES

SENSOR

17 18 19 20 21 22 23 24

Figure 31. Example of Low Power Mode Proximity Detection (LP_PROXIMITY_CNT = 4)

Rev. E | Page 20 of 70

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