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AD7142 Arkusz danych(PDF) 19 Page - Analog Devices |
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AD7142 Arkusz danych(HTML) 19 Page - Analog Devices |
19 / 70 page Data Sheet AD7142 Rev. B | Page 19 of 70 PROXIMITY DETECTION (INTERNAL) CALIBRATION (INTERNAL) 1 2 3 4 5 6 7 8 9 10 11 1213 14 15 16 CDC CONVERSION SEQUENCE (INTERNAL) CALIBRATION ENABLED CALIBRATION DISABLED tCONV_FP USER LEAVES SENSOR AREA HERE USER APPROACHES SENSOR HERE tCALDIS Figure 28. Full Power Mode Proximity Detection Example with 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 1213 14 15 16 CDC CONVERSION SEQUENCE (INTERNAL) USER LEAVES SENSOR AREA HERE USER APPROACHES SENSOR HERE 1718 19 20 21 2223 24 Figure 29. Low Power Mode Proximity Detection with LP_PROXIMITY_CNT = 4 CALIBRATION ENABLED tRECAL_TIMEOUT 16 30 70 tCONV_FP MEASURED CDC VALUE > STORED AMBIENT BY PROXIMITY_RECAL _LVL RECALIBRATION TIME-OUT PROXIMITY DETECTION (INTERNAL) CALIBRATION (INTERNAL) CDC CONVERSION SEQUENCE (INTERNAL) RECALIBRATION COUNTER (INTERNAL) NOTES 1. SEQUENCE CONVERSION TIME tCONV_FP DETERMINED FROM TABLE 10 2. tCALDIS = tCONV_FP × FP_PROXIMITY_CNT ×16 3. tRECAL_TIMEOUT = tCONV_FP × FP_PROXIMITY_RECAL 4. tRECAL = 2 × tCONV_FP USER APPROACHES SENSOR HERE USER LEAVES SENSOR AREA HERE tCALDIS tRECAL CALIBRATION DISABLED Figure 30. Full Power Mode Proximity Detection with Forced Recalibration Example with FP_PROXIMITY_CNT = 1 and FP_PROXIMITY_RECAL = 40 |
Podobny numer części - AD7142_17 |
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Podobny opis - AD7142_17 |
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