AD7142 Analog Devices, AD7142 Datasheet - Page 38

• 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
TYPICAL APPLICATION CIRCUITS
BUTTON
BUTTON
SLIDER
SCROLL WHEEL
BUTTON
BUTTON
BUTTON
SENSOR PCB
BUTTON
BUTTON
Figure 57. Typical Application Circuit with SPI Interface
Figure 58. Typical Application Circuit with I
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CIN10
Rev. A | Page 38 of 72
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CIN4
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CIN6
CIN7
CIN8
CIN9
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AD7142-1
AV
10nF
CC,
DV
CC
10nF
AD7142
AV
CC,
DGND2
DGND1
2
V
C Interface
ADD0
SCLK
ADD1
DRIVE
DV
DV
SDA
CC
V
CC
DRIVE
24
23
22
21
20
19
18
17
2.2kΩ
V
DGND2
DGND1
DRIVE
V
SCLK
DV
DRIVE
SDO
2.2kΩ
SDI
CS
0.1µF
CC
V
DRIVE
24
23
22
21
20
19
18
17
2.2kΩ
V
DRIVE
1µF TO 10µF
(OPTIONAL)
INT
SCK
SDO
2.2kΩ
0.1µF
AV
CC,
SS
SCK
INT
MOSI
MISO
INTERFACE
DV
1µF TO 10µF
(OPTIONAL)
INTERFACE
V
CC
1.8V
HOST
AV
2.7V TO 3.6V
HOST
WITH
HOST
WITH
CC,
I
2
SPI
C
DV
CC
2.7V TO 3.6V