AD7142 Analog Devices, AD7142 Datasheet - Page 9

• 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

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
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
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
CIN10
CIN11
CIN12
CIN13
C
AV
AGND
SRC
SRC
DV
DGND1
DGND2
V
SDO
SDA
SDI
ADD0
SCLK
CS
ADD1
INT
GPIO
TEST
V
V
CIN0
CIN1
CIN2
Mnemonic
SHIELD
DRIVE
REF+
REF−
CIN10
CC
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
CC
Figure 6. AD7142 Pin Configuration
1
2
3
4
5
6
7
8
PIN 1
INDICATOR
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
(AD7142) SPI Serial Data Input.
(AD7142-1) I
Clock Input for Serial Interface.
(AD7142) SPI Chip Select Signal.
(AD7142-1) I
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.
AD7142
TOP VIEW
2
2
2
C Serial Data Input/Output. SDA requires pull-up resistor.
C Address Bit 0.
C Address Bit 1.
24 CS
23 SCLK
22 SDI
21 SDO
20 V
19 DGND2
18 DGND1
17 DV
DRIVE
CC
Rev. A | Page 9 of 72
CIN10
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
Figure 7. AD7142-1 Pin Configuration
1
2
3
4
5
6
7
8
(Not to Scale)
AD7142-1
PIN 1
INDICATOR
TOP VIEW
24 ADD1
23 SCLK
22 ADD0
21 SDA
20 V
19 DGND2
18 DGND1
17 DV
DRIVE
CC
AD7142