AD7142 Analog Devices, AD7142 Datasheet - Page 29

• 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

Table 14. GPIO Interrupt Behavior
GPIO_INPUT_CONFIG
00 = Negative Level Triggered
00 = Negative Level Triggered
01 = Positive Edge Triggered
01 = Positive Edge Triggered
10 = Negative Edge Triggered
10 = Negative Edge Triggered
11 = Positive Level Triggered
11 = Positive Level Triggered
GPIO INPUT LOW WHEN REGISTER IS READ BACK
GPIO INPUT HIGH WHEN REGISTER IS READ BACK
READBACK
OUTPUT
NOTES
1. READ GPIO_STATUS REGISTER TO RESET INT OUTPUT.
OUTPUT
SERIAL
INPUT
INPUT
GPIO
Figure 43. INT Output Controlled by the GPIO Input Example,
GPIO
INT
INT
GPIO_SETUP = 01, GPIO_INPUT_CONFIG = 10
GPIO Pin
1
0
1
0
1
0
1
0
1
GPIO_STATUS
0
1
1
0
0
1
1
0
Rev. A | Page 29 of 72
INT
1
0
0
1
1
0
0
1
GPIO INPUT LOW WHEN REGISTER IS READ BACK
GPIO INPUT HIGH WHEN REGISTER IS READ BACK
READBACK
OUTPUT
NOTES
1. READ GPIO_STATUS REGISTER TO RESET INT OUTPUT.
OUTPUT
SERIAL
INPUT
INPUT
GPIO
GPIO
Figure 44. INT Output Controlled by the GPIO Input Example,
INT
INT
GPIO_SETUP = 01, GPIO_INPUT_CONFIG = 11
INT Behavior
Not triggered
Asserted when signal on GPIO pin is low
Pulses low at low-to-high GPIO transition
Not triggered
Pulses low at high-to-low GPIO transition
Not triggered
Asserted when signal on GPIO pin is high
Not triggered
1
AD7142