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AD7147 Datasheet(PDF) 21 Page - Analog Devices |
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AD7147 Datasheet(HTML) 21 Page - Analog Devices |
21 / 71 page 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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