AD7877 Analog Devices, AD7877 Datasheet - Page 31
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AD7877
Manufacturer Part Number
AD7877
Description
Touch Screen Controller
Manufacturer
Analog Devices
Datasheet
1.AD7877.pdf
(44 pages)
Specifications of AD7877
Resolution (bits)
12bit
# Chan
9
Sample Rate
125kSPS
Interface
Ser
Analog Input Type
SE-Uni
Ain Range
Uni (Vref),Uni 2.5V
Adc Architecture
SAR
Pkg Type
CSP
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Data Sheet
If the ALERT source is a GPIO, then masking out the interrupt
by clearing the corresponding ALEN bit to 0 or removing the
source of the interrupt on the GPIO pin causes ALERT to go
high again.
If the ALERT source is an out-of-limit measurement, writing a
0 to the corresponding status bit in the alert status/enable
register causes ALERT to go high. However, the status bit is set
to 1 again on the next measurement cycle, if the measurement
remains out of limit. The ALERT source can also be masked by
clearing the relevant bit in the alert status/enable register to 0.
Rev. D | Page 31 of 44
Table 12. GPIO Configuration
EN
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
A change in the data register causes a change in the output voltage on the pin.
A change in input voltage on the pin causes a change in the data register bit.
DIR
X
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
POL
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
ALEN
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Data Bit
X
0
1
0
1
0
1
0
1
1
0
1
0
0
1
0
1
2
2
2
2
2
2
2
2
Pin Voltage
X
1
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
AD7877
ALERT
X
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
0