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AD7147A Arkusz danych(PDF) 20 Page - Analog Devices

Numer części AD7147A
Szczegółowy opis  CapTouch Programmable Controller
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Strona internetowa  http://www.analog.com
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AD7147A
Rev. B | Page 19 of 68
Table 13. Proximity Control Registers (See Figure 33)
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
10
0x004[9:0]
Full power mode proximity recalibration time control.
LP_PROXIMITY_RECAL
6
0x004[15:10]
Low power mode proximity recalibration time control.
PROXIMITY_RECAL_LVL
8
0x003[7:0]
Proximity recalibration level. This value, multiplied by 16, controls the
sensitivity of Comparator 2 (see Figure 33).
PROXIMITY_DETECTION_RATE
6
0x003[13:8]
Proximity detection rate. This value, multiplied by 16, controls the
sensitivity of Comparator 1 (see Figure 33).
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 29. 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 THE 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
123456
789 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 30. Example of Low Power Mode Proximity Detection (LP_PROXIMITY_CNT = 4)


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