EVAL-AD7877EBZ Analog Devices Inc, EVAL-AD7877EBZ Datasheet - Page 31

• Manufacturer Part Number: EVAL-AD7877EBZ
• Description: BOARD EVALUATION FOR AD7877
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7877EBZ

• Main Purpose: Interface, Touch Screen Controller
• Embedded: No
• Utilized Ic / Part: AD7877
• Primary Attributes: 4-Wire Resistive Touch Screen Controller, SPI Interface, On-Chip: Temp Sensor, Voltage Reference, 8-Bit DAC
• Secondary Attributes: USB GUI, LCD Noise Reduction Feature, 2.7 ~ 5.25 V, Wake Up on Touch Feature
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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. C | 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