AD7142 Analog Devices, AD7142 Datasheet - Page 56

• 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 47. STAGEX Detailed Offset Control Description (X = 0 to 11)
Data Bit
[6:0]
[7]
[14:8]
[15]
Table 48. STAGEX Detailed Sensitivity Control Description (X = 0 to 11)
Data Bit
[3:0]
[6:4]
[7]
[11:8]
[14:12]
[15]
Default
Value
X
X
X
X
Default
Value
X
X
X
X
X
X
Type
R/W
R/W
R/W
R/W
Type
R/W
R/W
R/W
R/W
R/W
R/W
Name
NEG_AFE_OFFSET
NEG_AFE_OFFSET_SWAP
POS_AFE_OFFSET
POS_AFE_OFFSET_SWAP
Name
NEG_THRESHOLD_SENSITIVITY
NEG_PEAK_DETECT
Unused
POS_THRESHOLD_SENSITIVITY
POS_PEAK_DETECT
Unused
Rev. A | Page 56 of 72
Description
Negative AFE offset setting (20 pF range)
Negative AFE offset swap control
Positive AFE offset setting (20 pF range)
Positive AFE offset swap control
Description
Negative threshold sensitivity control
Negative peak detect setting
Set unused register bits = 0
Positive threshold sensitivity control
Positive peak detect setting
Set unused register bits = 0
1 LSB value = 0.16 pF of offset
0 = NEG_AFE_OFFSET applied to CDC negative input
1 = NEG_AFE_OFFSET applied to CDC positive input
1 LSB value = 0.16 pF of offset
0 = POS_AFE_OFFSET applied to CDC positive input
1 = POS_AFE_OFFSET applied to CDC negative input
0000 = 25%, 0001 = 29.73%, 0010 = 34.40%, 0011 = 39.08%
0100 = 43.79%, 0101 = 48.47%, 0110 = 53.15%
0111 = 57.83%, 1000 = 62.51%, 1001 = 67.22%
1010 = 71.90%, 1011 = 76.58%, 1100 = 81.28%
1101 = 85.96%, 1110 = 90.64%, 1111 = 95.32%
000 = 40% level, 001 = 50% level, 010 = 60% level
011 = 70% level, 100 = 80% level, 101 = 90% level
0000 = 25%, 0001 = 29.73%, 0010 = 34.40%, 0011 = 39.08%
0100 = 43.79%, 0101 = 48.47%, 0110 = 53.15%
0111 = 57.83%, 1000 = 62.51%, 1001 = 67.22%
1010 = 71.90%, 1011 = 76.58%, 1100 = 81.28%
1101 = 85.96%, 1110 = 90.64%, 1111 = 95.32%
000 = 40% level, 001 = 50% level, 010 = 60% level
011 = 70% level, 100 = 80% level, 101 = 90% level