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AD7147 Datasheet(PDF) 21 Page - Analog Devices

Part # AD7147
Description  CapTouch Programmable Controller
PDF  71 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
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)
1
2
3
4
5
6
7
8
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.
3.
tCALDIS = (tCONV_LP × LP_PROXIMITY_CNT × 4).
CALIBRATION ENABLED
CALIBRATION DISABLED
PROXIMITY
DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
tCALDIS
tCONV_LP
1
2
3
4
5
6
7
8
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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