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AD7147A Arkusz danych(PDF) 23 Page - Analog Devices

Numer części AD7147A
Szczegółowy opis  CapTouch Programmable Controller
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Strona internetowa  http://www.analog.com
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AD7147A Arkusz danych(HTML) 23 Page - Analog Devices

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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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