EVAL-AD7877EBZ Analog Devices Inc, EVAL-AD7877EBZ Datasheet - Page 41

• 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

Register Name: GPIO Control Register 2
Write Address: [1111] 0001; Read Address: 11100; Default Value: 0x000; Type: Read/Write.
Table 23.
Bit
0
1
2
3
4
5
6
7
Register Name: GPIO Data Register
Write Address: [1111] 0010; Read Address: 11101; Default Value: 0x000; Type: Read/Write.
Table 24.
Bit
0
1
2
3
4
5
6
7
Name
GPIO4_ALEN
GPIO4_DIR
GPIO4_POL
Not Used
GPIO3_ALEN
GPIO3_DIR
GPIO3_POL
GPIO3_EN
Name
Not used
Not used
Not used
Not used
GPIO4_DAT
GPIO3_DAT
GPIO2_DAT
GPIO1_DAT
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Read/Write
R/W
R/W
R/W
R/W
Description
If this bit is 1, GPIO4 is an interrupt source for the ALERT output; clearing this bit masks out GPIO3
as an interrupt source for the ALERT output
This bit sets the direction of GPIO4
This bit determines if GPIO4 is active high or low
This bit is not used
If this bit is 1, GPIO3 is an interrupt source for the ALERT output; clearing this bit masks out GPIO4
as an interrupt source for the ALERT output
This bit sets the direction of GPIO3
This bit determines if GPIO3 is active high or low
This bit selects the function of AUX3/GPIO3
Description
This bit is not used
This bit is not used
This bit is not used
This bit is not used
GPIO4 data bit
GPIO3 data bit
GPIO2 data bit
GPIO1 data bit
0 = output
1 = input
0 = active low
1 = active high
0 = output
1 = input
0 = active low
1 = active high
0 = AUX3
1 = GPIO3
Rev. B | Page 41 of 44
AD7877