AD7142 Analog Devices, AD7142 Datasheet - Page 42

• Manufacturer Part Number: AD7142
• Description: Programmable Controller for Capacitance Touch Sensors
• Manufacturer: Analog Devices

Specifications of AD7142

• Resolution (bits): 16bit
• # Chan: 14
• Sample Rate: 250kSPS
• Interface: I²C/Ser 2-Wire,Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: ± 2 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

AD7142
Table 21. AMB_COMP_CTRL0 Register
Address
0x002
Table 22. AMB_COMP_CTRL1 Register
Address
0x003
Table 23. AMB_COMP_CTRL2 Register
Address
0x004
Data Bit
[3:0]
[7:4]
[11:8]
[13:12]
[14]
[15]
Data Bit
[7:0]
[13:8]
[15:14]
Data Bit
[9:0]
[15:10]
Default Value
0
F
F
0
0
0
Default
Value
64
1
0
Default
Value
3FF
3F
Type
R/W
Type
R/W
Type
R/W
Name
PROXIMITY_RECAL_LVL
PROXIMITY_DETECTION_RATE
SLOW_FILTER_UPDATE_LVL
Name
FP_PROXIMITY_RECAL
LP_PROXIMITY_RECAL
Name
FF_SKIP_CNT
FP_PROXIMITY_CNT
LP_PROXIMITY_CNT
PWR_DOWN_TIMEOUT
FORCED_CAL
CONV_RESET
Rev. A | Page 42 of 72
Full power to low power mode timeout control
Proximity recalibration level
Proximity detection rate
Slow filter update level
Full power mode proximity recalibration time control
Low power mode proximity recalibration time control
Description
Fast filter skip control (N+1)
Calibration disable period in full power mode =
FP_PROXIMITY_CNT × 16 × Time taken for one
conversion sequence in full power mode
Calibration disable period in low power mode =
LP_PROXIMITY_CNT × 4 × Time taken for one
conversion sequence in low power mode
Forced calibration control
Conversion reset control (self-clearing)
Description
Description
0000 = no sequence of results are skipped
0001 = one sequence of results is skipped for every
one allowed into fast FIFO
0010 = two sequences of results are skipped for every
one allowed into fast FIFO
1011 = maximum value = 12 sequences of results are
skipped for every one allowed into Fast FIFO
00 = 1.25 × (FP_PROXIMITY_CNT)
01 = 1.50 × (FP_PROXIMITY_CNT)
10 = 1.75 × (FP_PROXIMITY_CNT)
11 = 2.00 × (FP_PROXIMITY_CNT)
0 = normal operation
1 = forces all conversion stages to recalibrate
0 = normal operation
1 = resets the conversion sequence back to STAGE0