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AD7142 Datasheet

  • AD7142

  • Programmable Capacitance-to-Digital Converter with Environme...

  • 66頁

  • AD

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AD7142
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
CIN2
CIN1
CIN0
V
REF鈥?/div>
V
REF+
TEST
GPIO
INT
32
31
30
29
28
27
26
25
32
31
30
29
28
27
26
25
CIN2
CIN1
CIN0
V
REF鈥?/div>
V
REF+
TEST
GPIO
INT
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
CIN10
1
2
3
4
5
6
7
8
PIN 1
INDICATOR
TOP VIEW
AD7142
24
23
22
21
20
19
18
17
CS
SCLK
SDI
SDO
V
DRIVE
DGND2
DGND1
DV
CC
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
CIN10
1
2
3
4
5
6
7
8
PIN 1
INDICATOR
AD7142-1
TOP VIEW
24
23
22
21
20
19
18
17
ADD1
SCLK
ADD0
SDA
V
DRIVE
DGND2
DGND1
DV
CC
CIN11 9
CIN12 10
CIN13 11
C
SHIELD
12
AV
CC
13
AGND 14
SRC 15
SRC 16
CIN11 9
CIN12 10
CIN13 11
C
SHIELD
12
AV
CC
13
AGND 14
SRC 15
SRC 16
Figure 4. AD7142 Pin Configuration
05702-005
Figure 5. AD7142-1 Pin Configuration
Table 7. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Mnemonic
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
CIN10
CIN11
CIN12
CIN13
C
SHIELD
AV
CC
AGND
SRC
SRC
DV
CC
DGND1
DGND2
V
DRIVE
SDO
SDA
SDI
ADD0
SCLK
CS
ADD1
INT
GPIO
TEST
V
REF+
V
REF鈭?/div>
CIN0
CIN1
CIN2
Description
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
CDC Shield Potential Output. Requires 10 nF capacitor to ground. Connect to external shield.
CDC Supply Voltage.
Analog Ground Reference Point for All CDC Circuitry. Tie to analog ground plane.
CDC Excitation Source Output.
Inverted Excitation Source Output.
Digital Core Supply Voltage.
Digital Ground.
Digital Ground.
Serial Interface Operating Voltage Supply.
AD7142 SPI Serial Data Output.
AD7142-1 I
2
C Serial Data Input/Output. SDA requires pull-up resistor.
AD7142 SPI Serial Data Input.
AD7142-1 I
2
C Address Bit 0.
Clock Input for Serial Interface.
AD7142 SPI Chip Select Signal.
AD7142-1 I
2
C Address Bit 1.
General-Purpose Open-Drain Interrupt Output. Programmable polarity; requires pull-up resistor.
Programmable GPIO.
Factory Test Pin. Tie to ground.
CDC Positive Reference Input. Normally tied to analog power.
CDC Negative Reference Input. Tie to analog ground.
Capacitance Sensor Input.
Capacitance Sensor Input.
Capacitance Sensor Input.
Rev. 0 | Page 8 of 68
05702-044

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