AD7147ACPZ-REEL Analog Devices Inc, AD7147ACPZ-REEL Datasheet - Page 22

• Manufacturer Part Number: AD7147ACPZ-REEL
• Description: IC,Converter, Other/Special/Miscellaneous,LLCC,24PIN
• Manufacturer: Analog Devices Inc
• Series: CapTouch™r
• Type: Capacitive Sensor Controllerr

Specifications of AD7147ACPZ-REEL

• Resolution (bits): 16 b
• Data Interface: Serial, SPI™
• Voltage Supply Source: Single Supply
• Voltage - Supply: 2.6 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7147EBZ - BOARD EVAL FOR AD7147ACPZEVAL-AD7147-1EBZ - BOARD EVAL FOR AD7147ACPZ-1
• Sampling Rate (per Second): -
• Lead Free Status / Rohs Status: Compliant

AD7147
SLOW_FILTER_UPDATE_LVL
SLOW_FILTER_EN
WORD0 – CDC VALUE
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 |
2. PROXIMITY 1 IS SET WHEN |STAGEx_FF_ WORD0 – STAGEx_FF_WORD3 | EXCEEDS THE VALUE PROGRAMMED IN THE
3. PROXIMITY 2 IS SET WHEN | AVERAGE – AMBIENT | EXCEEDS THE VALUE PROGRAMMED IN THE PROXIMITY_RECAL_LVL REGISTER.
4. DESCRIPTION OF COMPARATOR FUNCTIONS:
COMPARATOR 3
REGISTER 0x003
EXCEEDS THE VALUE PROGRAMMED IN THE SLOW_FILTER_UPDATE_LVL REGISTER PROVIDING PROXIMITY IS NOT SET.
PROXIMITY_DETECTION_RATE REGISTER.
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.
COMPARATOR 3: USED TO ENABLE THE SLOW FILTER UPDATE RATE. THE SLOW FILTER IS UPDATED WHEN SLOW_FILTER_EN IS SET AND
PROXIMITY
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.
PROXIMITY IS NOT SET.
CDC
16
STAGEx_FF_WORD0
STAGEx_FF_WORD1
STAGEx_FF_WORD2
STAGEx_FF_WORD3
STAGEx_FF_WORD4
STAGEx_FF_WORD5
STAGEx_FF_WORD6
STAGEx_FF_WORD7
Σ
N = 0
7
WORD(N)
STAGEx_SF_WORD0
STAGEx_SF_WORD1
STAGEx_SF_WORD2
STAGEx_SF_WORD3
STAGEx_SF_WORD4
STAGEx_SF_WORD5
STAGEx_SF_WORD6
STAGEx_SF_WORD7
BANK 3 REGISTERS
8
BANK 3 REGISTERS
SW1
BANK 3 REGISTERS
STAGEx_FF_AVG
PROXIMITY_DETECTION_RATE
Figure 34. AD7147 Proximity-Detection Logic
|WORD0 – WORD3|
REGISTER 0x003
STAGEx_SF_AMBIENT
COMPARATOR 1
BANK 3 REGISTERS
Rev. B | Page 22 of 72
PROXIMITY_RECAL_LVL
|AVERAGE – AMBIENT|
COMPARATOR 2
REGISTER 0x003
PROXIMITY 1
PROXIMITY
FP_PROXIMITY_RECAL
STAGEx_SF_WORDx
FP_PROXIMITY_CNT
STAGEx_FF_WORDx
REGISTER 0x002
REGISTER 0x004
PROXIMITY TIMING
CONTROL LOGIC
CONTACT
SENSOR
LP_PROXIMITY_RECAL
LP_PROXIMITY_CNT
REGISTER 0x002
REGISTER 0x004
AMBIENT
VALUE
t