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AD7142 Datasheet(PDF) 21 Page - Analog Devices |
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AD7142 Datasheet(HTML) 21 Page - Analog Devices |
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21 / 68 page  AD7142 Rev. 0 | Page 21 of 68 Σ-Δ 16-BIT CDC STAGE_FF_WORD0 8 7 N = 0 PROXIMITY_DETECTION_RATE REGISTER 0x003 PROXIMITY_RECAL_LVL REGISTER 0x003 BANK 3 REGISTERS PROXIMITY AVERAGE – AMBIENT SLOW_FILTER_UPDATE_LVL REGISTER 0x003 WORD0 – WORD3 BANK 3 REGISTERS SW1 16 NOTES 1. SLOW FILTER EN IS SET AND SW1 IS CLOSED WHEN |WORD 0–WORD 3| EXCEEDS THE VALUE PROGRAMMED IN THE SLOW_FILTER_UPDATE_LVL REGISTER PROVIDING PROXIMITY IS NOT SET. 2. PROXIMITY 1 IS SET WHEN |WORD 0–WORD 3| EXCEEDS THE VALUE PROGRAMMED IN THE PROXIMITY_DETECTION_RATE REGISTER. 3. PROXIMITY 2 IS SET WHEN |AVERAGE–AMBIENT| EXCEEDS THE VALUE PROGRAMMED IN THE PROXIMITY_RECAL_LVL REGISTER. 4. DESCRIPTION OF COMPARATOR FUNCTIONS: COMPARATOR 1: USED TO DETECT WHEN A USER IS APPROACHING OR LEAVING A SENSOR. COMPARATOR 2: USED TO DETECT WHEN A USER IS HOVERING OVER A SENSOR, OR APPROACHING A SENSOR VERY SLOWLY. STAGE_SF_WORD0 SW CONTROL LOGIC FP_PROXIMITY_RECAL REGISTER 0x004 LP_PROXIMITY_RECAL REGISTER 0X004 COMPARATOR 3 PROXIMITY AMBIENT VALUE STAGE_SF_WORDX TIME SENSOR CONTACT STAGE_SF_AMBIENT BANK 3 REGISTERS STAGE_FF_AVG BANK 3 REGISTERS STAGE_MAX_WORD0 STAGE_MAX_WORD1 STAGE_MAX_WORD2 STAGE_MAX_WORD3 STAGE_MAX_AVG BANK 3 REGISTERS STAGE_HIGH_THRESHOLD BANK 3 REGISTERS STAGE_MAX_TEMP BANK 3 REGISTERS MAX LEVEL DETECTION LOGIC BANK 3 REGISTERS STAGE_MIN_WORD0 STAGE_MIN_WORD1 STAGE_MIN_WORD2 STAGE_MIN_WORD3 STAGE_MIN_AVG BANK 3 REGISTER3 STAGE_LOW_THRESHOLD BANK 3 REGISTERS STAGE_MIN_TEMP BANK 3 REGISTERS MIN LEVEL DETECTION LOGIC BANK 3 REGISTERS FP_PROXIMITY_CNT REGISTER 0x002 LP_PROXIMITY_CNT REGISTER 0X002 PROXIMITY 1 PROXIMITY TIMING CONTROL LOGIC COMPARATOR 1 COMPARATOR 2 WORD(N) Σ STAGE_SF_WORD2 STAGE_SF_WORD1 STAGE_SF_WORD4 STAGE_SF_WORD3 STAGE_SF_WORD5 STAGE_SF_WORD7 STAGE_SF_WORD6 STAGE_FF_WORD7 STAGE_FF_WORD6 STAGE_FF_WORD5 STAGE_FF_WORD4 STAGE_FF_WORD3 STAGE_FF_WORD2 STAGE_FF_WORD1 STAGE_FF_WORDX ALSO USED TO DETECT IF THE SENSOR AMBIENT LEVEL HAS CHANGED AS A RESULT OF THE USER INTERACTION. FOR EXAMPLE, HUMIDITY OR DIRT LEFT BEHIND ON SENSOR. COMPARATOR 3: USED TO ENABLE THE SLOW FILTER UPDATE RATE. THE SLOW FILTER IS UPDATED WHEN SLOW FILTER EN IS SET AND PROXIMITY IS NOT SET. WORD0 – WORD3 Figure 30. AD7142 Proximity Detection and Environmental Calibration |
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