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AD7147A Datasheet(PDF) 20 Page - Analog Devices |
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AD7147A Datasheet(HTML) 20 Page - Analog Devices |
20 / 69 page 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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