EVAL-AD7877EBZ Analog Devices Inc, EVAL-AD7877EBZ Datasheet - Page 35

• 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

DETAILED REGISTER DESCRIPTIONS
Register Name: Control Register 1
Write Address: 0001; Read Address: 00001; Default Value: 0x000; Type: Read/Write.
Table 16.
Bit
0
1
2
3
4
5
6
7
8
9
10
11
Name
MODE0
MODE1
RD0
RD1
RD2
RD3
RD4
CHADD0
CHADD1
CHADD2
CHADD3
SER/DFR
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
LSB of ADC mode code.
MSB of ADC mode code.
LSB of register read address. To read a register, its address must first be written to Control Register 1.
Bit 1 of register read address. To read a register, its address must first be written to Control Register 1.
Bit 2 of register read address. To read a register, its address must first be written to Control Register 1.
Bit 3 of register read address. To read a register, its address must first be written to Control Register 1.
MSB of register read address. To read a register, its address must first be written to Control Register 1.
LSB of ADC channel address.
Bit 1 of ADC channel address.
Bit 2 of ADC channel address.
MSB of ADC channel address.
Selects normal (single-ended) or ratiometric (differential) conversion.
00 = no conversion.
01 = single conversion.
10 = conversion sequence (slave mode).
11 = conversion sequence (master mode).
0000 = X+ input (Y position).
0001 = Y+ input (X position).
0010 = Y− (Z2) input (used for touch-pressure calculation).
0011 = Auxiliary Input 1 (AUX1).
0100 = Auxiliary Input 2 (AUX2).
0101 = Auxiliary Input 3 (AUX3).
0110 = Battery Monitor Input 1 (BAT1).
0111 = Battery Monitor Input 2 (BAT2).
1000 = Temperature Measurement 1 (used for single conversion).
1001 = Temperature Measurement 2 (used for differential measurement method).
1010 = X+ (Z1) input (used for touch-pressure calculation).
0 = ratiometric (differential).
1 = normal (single-ended).
Rev. B | Page 35 of 44
AD7877