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AD7147A Arkusz danych(PDF) 23 Page - Analog Devices |
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AD7147A Arkusz danych(HTML) 23 Page - Analog Devices |
23 / 69 page AD7147A Rev. B | Page 22 of 68 NOTES 1. SLOW_FILTER_EN, WHICH IS THE NAME OF THE OUTPUT OF COMPARATOR 3, IS SET AND SW1 IS CLOSED WHEN |STAGEx_SF_WORD0 – CDC VALUE| EXCEEDS THE VALUE PROGRAMMED IN THE SLOW_FILTER_UPDATE_LVL REGISTER PROVIDING PROXIMITY IS NOT SET. 2. PROXIMITY 1 IS SET WHEN |STAGEx_FF_WORD0 – STAGEx_FF_WORD3| 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. 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. BANK 3 REGISTERS BANK 3 REGISTERS SW1 PROXIMITY SLOW_FILTER_EN STAGEx_SF_WORD0 STAGEx_SF_WORD1 STAGEx_SF_WORD2 STAGEx_SF_WORD3 STAGEx_SF_WORD4 STAGEx_SF_WORD5 STAGEx_SF_WORD6 STAGEx_SF_WORD7 STAGEx_FF_WORD0 STAGEx_FF_WORD1 STAGEx_FF_WORD2 STAGEx_FF_WORD3 STAGEx_FF_WORD4 STAGEx_FF_WORD5 STAGEx_FF_WORD6 STAGEx_FF_WORD7 8 7 ΣWORD(N) N = 0 COMPARATOR 3 |WORD0 – CDC VALUE| SLOW_FILTER_UPDATE_LVL REGISTER 0x003 STAGEx_SF_AMBIENT BANK 3 REGISTERS 16 CDC COMPARATOR 1 |WORD0 – WORD3| PROXIMITY_DETECTION_RATE REGISTER 0x003 COMPARATOR 2 |AVERAGE – AMBIENT| PROXIMITY_RECAL_LVL REGISTER 0x003 PROXIMITY 1 PROXIMITY LP_PROXIMITY_CNT REGISTER 0x002 FP_PROXIMITY_CNT REGISTER 0x002 LP_PROXIMITY_RECAL REGISTER 0x004 FP_PROXIMITY_RECAL REGISTER 0x004 PROXIMITY TIMING CONTROL LOGIC t AMBIENT VALUE STAGEx_SF_WORDx STAGEx_FF_WORDx SENSOR CONTACT STAGEx_FF_AVG BANK 3 REGISTERS Figure 33. Proximity-Detection Logic |
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