AD7143ACPZ Analog Devices Inc, AD7143ACPZ Datasheet - Page 21

• Manufacturer Part Number: AD7143ACPZ
• Description: IC, CDC, 16BIT, SMD, LFCSP-16, 7143
• Manufacturer: Analog Devices Inc

Specifications of AD7143ACPZ

• Supply Voltage Range: 2.6V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LFCSP
• No. Of Pins: 16
• Svhc: No SVHC (18-Jun-2010)
• Package / Case: LFCSP
• Base Number: 7143
• Ic Function: Programmable Controller For Capacitance Touch Sensors
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SLOW_FILTER_EN
SLOW_FILTER_UPDATE_LVL
NOTES
1. SLOW FILTER EN IS SET AND SW1 IS CLOSED WHEN |STAGE_SF_ WORD 0 TO STAGE_SF_WORD 1 | EXCEEDS THE VALUE PROGRAMMED IN THE
2. PROXIMITY 1 IS SET WHEN |STAGE_FF_ WORD 0 TO STAGE_FF_WORD 3 | 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:
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
WORD0 TO WORD1
PROXIMITY
COMPARATOR 3
REGISTER 0x003
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
STAGE_FF_WORD0
STAGE_FF_WORD1
STAGE_FF_WORD2
STAGE_FF_WORD3
STAGE_FF_WORD4
STAGE_FF_WORD5
STAGE_FF_WORD6
STAGE_FF_WORD7
16-BIT
CDC
Σ-Δ
Σ
N = 0
7
WORD(N)
STAGE_SF_WORD0
STAGE_SF_WORD1
STAGE_SF_WORD2
STAGE_SF_WORD3
STAGE_SF_WORD4
STAGE_SF_WORD5
STAGE_SF_WORD6
STAGE_SF_WORD7
8
BANK 3 REGISTERS
16
Figure 31. AD7143 Proximity Detection and Environmental Calibration
Figure 32. AD7143 Maximum and Minimum Level Detection Logic
SW1
BANK 3 REGISTERS
STAGE_FF_AVG
PROXIMITY_DETECTION_RATE
|WORD0 TO WORD3|
REGISTER 0x003
COMPARATOR 1
STAGE_SF_AMBIENT
BANK 3 REGISTERS
DETECTION
DETECTION
MAX LEVEL
MIN LEVEL
LOGIC
LOGIC
Rev. 0 | Page 21 of 56
PROXIMITY_RECAL_LVL
|AVERAGE–AMBIENT|
REGISTER 0x003
COMPARATOR 2
PROXIMITY 1
STAGE_HIGH_THRESHOLD
STAGE_LOW_THRESHOLD
STAGE_MAX_WORD0
STAGE_MAX_WORD1
STAGE_MAX_WORD2
STAGE_MAX_WORD3
STAGE_MIN_WORD0
STAGE_MIN_WORD1
STAGE_MIN_WORD2
STAGE_MIN_WORD3
BANK 3 REGISTERS
BANK 3 REGISTERS
BANK 3 REGISTERS
BANK 3 REGISTERS
BANK 3 REGISTERS
BANK 3 REGISTERS
STAGE_MAX_TEMP
STAGE_MAX_AVG
STAGE_MIN_AVG
STAGE_MIN_AVG
PROXIMITY
FP_PROXIMITY_RECAL
STAGE_SF_WORDx
FP_PROXIMITY_CNT
REGISTER 0x002
REGISTER 0x004
STAGE_FF_WORDx
BANK 3 REGISTERS
BANK 3 REGISTERS
PROXIMITY TIMING
CONTROL LOGIC
CONTACT
SENSOR
LP_PROXIMITY_RECAL
LP_PROXIMITY_CNT
REGISTER 0x002
REGISTER 0x004
AMBIENT
VALUE
TIME
AD7143