Datasheet
AD7142
Rev. A | Page 9 of 72
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
0
5702-005
PIN 1
INDICATOR
1CIN3
2CIN4
3CIN5
4CIN6
5CIN7
6CIN8
7CIN9
8CIN10
24 CS
23 SCLK
22 SDI
21 SDO
20 V
DRIVE
19 DGND2
18 DGND1
17 DV
CC
9
CIN11
10
CIN12
11
CIN13
12
C
SHIELD
13
AV
CC
14
AGND
15
SRC
16
SRC
32
CIN2
31
CIN1
30
CIN0
29
V
REF–
28
V
REF+
27
TEST
26
GPIO
25
INT
TOP VIEW
AD7142
Figure 6. AD7142 Pin Configuration
PIN 1
INDICATOR
1CIN3
2CIN4
3CIN5
4CIN6
5CIN7
6CIN8
7CIN9
8CIN10
24 ADD1
23 SCLK
22 ADD0
21 SDA
20 V
DRIVE
19 DGND2
18 DGND1
17 DV
CC
9
CIN11
10
CIN12
11
C
IN13
12
C
SHIELD
13
AV
CC
14
AGND
15
SRC
16
SRC
32
CIN2
31
CIN1
30
CIN0
29
V
REF–
28
V
REF+
27
TE
ST
26
GPIO
25
INT
TOP VIEW
(Not to Scale)
AD7142-1
05702-044
Figure 7. AD7142-1 Pin Configuration
Table 7. Pin Function Descriptions
Pin No. Mnemonic Description
1 CIN3 Capacitance Sensor Input.
2 CIN4 Capacitance Sensor Input.
3 CIN5 Capacitance Sensor Input.
4 CIN6 Capacitance Sensor Input.
5 CIN7 Capacitance Sensor Input.
6 CIN8 Capacitance Sensor Input.
7 CIN9 Capacitance Sensor Input.
8 CIN10 Capacitance Sensor Input.
9 CIN11 Capacitance Sensor Input.
10 CIN12 Capacitance Sensor Input.
11 CIN13 Capacitance Sensor Input.
12 C
SHIELD
CDC Shield Potential Output. Requires 10 nF capacitor to ground. Connect to external shield.
13 AV
CC
CDC Supply Voltage.
14 AGND Analog Ground Reference Point for All CDC Circuitry. Tie to analog ground plane.
15 SRC CDC Excitation Source Output.
16
SRC
Inverted Excitation Source Output.
17 DV
CC
Digital Core Supply Voltage.
18 DGND1 Digital Ground.
19 DGND2 Digital Ground.
20 V
DRIVE
Serial Interface Operating Voltage Supply.
21 SDO (AD7142) SPI Serial Data Output.
SDA (AD7142-1) I
2
C Serial Data Input/Output. SDA requires pull-up resistor.
22 SDI (AD7142) SPI Serial Data Input.
ADD0 (AD7142-1) I
2
C Address Bit 0.
23 SCLK Clock Input for Serial Interface.
24
CS
(AD7142) SPI Chip Select Signal.
ADD1 (AD7142-1) I
2
C Address Bit 1.
25
INT
General-Purpose Open-Drain Interrupt Output. Programmable polarity; requires pull-up resistor.
26 GPIO Programmable GPIO.
27 TEST Factory Test Pin. Tie to ground.
28 V
REF+
CDC Positive Reference Input. Normally tied to analog power.
29 V
REF−
CDC Negative Reference Input. Tie to analog ground.
30 CIN0 Capacitance Sensor Input.
31 CIN1 Capacitance Sensor Input.
32 CIN2 Capacitance Sensor Input.