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AD7147 Datasheet(PDF) 21 Page - Analog Devices

Part # AD7147
Description  CapTouch Programmable Controller for Single-Electrode Capacitance Sensors
PDF  73 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7147 Datasheet(HTML) 21 Page - Analog Devices

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AD7147
Data Sheet
Rev. D | Page 20 of 72
Table 12. Proximity Control Registers (See Figure 34)
Bit Name
Length
(Bits)
Register Address
Description
FP_PROXIMITY_CNT
4
0x002[7:4]
Calibration disable time in full power mode.
LP_PROXIMITY_CNT
4
0x002[11:8]
Calibration disable time in low power mode.
FP_PROXIMITY_RECAL
8
0x004[9:0]
Full power mode proximity recalibration time.
LP_PROXIMITY_RECAL
6
0x004[15:10]
Low power mode proximity recalibration time.
PROXIMITY_RECAL_LVL
8
0x003[7:0]
Proximity recalibration level. This value multiplied by 16 controls the
sensitivity of Comparator 2 (see Figure 34).
PROXIMITY_DETECTION_RATE
6
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)
12 3456789 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.
3.
tCALDIS = (tCONV_LP × LP_PROXIMITY_CNT × 4).
CALIBRATION ENABLED
CALIBRATION DISABLED
PROXIMITY
DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
tCALDIS
tCONV_LP
12 3456789 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)



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