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EVAL-AD7843EBZ

P1-P3P4-P6P7-P9P10-P12
Evaluation Board User Guide
UG-062
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluation Board for AD7843/AD7873 Resistive Touch Screen Controllers
See the last page for an important warning and disclaimers. Rev. 0 | Page 1 of 12
FEATURES
Easy access to the AD7843/AD7873
Connects to any PC USB port
Self-contained evaluation system
Test points for easy access to signals
Touch screen included
PACKAGE CONTENTS
The AD7843/AD7873 evaluation board kit contains the following:
• The AD7843/AD7873 evaluation board
• A USB cable
• A CD with the evaluation software, schematics, and this
user guide
• A 4-wire resistive screen
GENERAL DESCRIPTION
The AD7843/AD7873 evaluation board allows the user to
evaluate all features of the AD7843/AD7873. The evaluation
software allows the user to change the settings on the AD7843/
AD7873. The users can connect the touch screen to the J3 connector,
or use the on-board variable resistors, to evaluate the touch screen
function.
EVALUATION BOARD BLOCK DIAGRAM
V
REF
IN4/AUX
DIN
Y
+
+V
CC
X–
DCL
K
GND
DOUT
Y–
CS
+V
CC
X+
AD7843/
AD7873
PENIRQ
HOST
INT1
CS
SPI
INTERFACE
SCLK
MISO
MOSI
TOUCH
SCREEN
0.1µF
1.0µF TO 10µF
(OPTIONAL)
VOLTAGE
REGULATOR
MAIN
BATTERY
OPTIONAL
R-C
J3-4
J3-3J3-2
J3-1
J1-1
J1-2
J1-3
J1-4
3.3V
TEST POINTS
TEST POINT
TEST POINTS
X+
Y+X–
Y–
IN
3/
V
BAT
BUSY
INT2
J7-2
3.3V
J2
3.3V
08633-001
NOTES
1. THE AUX AND V
BAT
PINS ONLY APPLY TO THE AD7873. THE IN3 AND IN4 PINS ONLY APPLY TO THE AD7843.
Figure 1.
UG-062 Evaluation Board User Guide
Rev. 0 | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Package Contents .............................................................................. 1
General Description ......................................................................... 1
Evaluation Board Block Diagram ................................................... 1
Revision History ............................................................................... 2
Evaluation Board .............................................................................. 3
Setting Up the Evaluation Board ................................................ 3
Evaluation Board Description .................................................... 3
Evaluation Board Hardware ............................................................ 4
Connector Function Descriptions ............................................. 4
Link Function Descriptions ........................................................ 4
Indicator LED Descriptions .........................................................4
Evaluation Board Software ...............................................................5
Installing the Software ..................................................................5
Running the Software ...................................................................5
Evaluation Demonstration ...............................................................6
Single Conversion Block ...............................................................6
Continuous X-Y Conversion .......................................................7
Touchscreen ...................................................................................8
Schematics ..........................................................................................9
ESD Caution................................................................................ 12
REVISION HISTORY
12/09—Revision 0: Initial Version
Evaluation Board User Guide UG-062
Rev. 0 | Page 3 of 12
EVALUATION BOARD
SETTING UP THE EVALUATION BOARD
Follow these steps to set up the AD7843/AD7873 evaluation
board:
• Install the evaluation software (CD) before connecting
the board.
• Plug the USB connector from the USB port on your PC
into the mini-USB socket on the evaluation board. The
power indicator LED on the board should turn on.
• Ensure that all switches and links are in their default
positions.
• Start the AD7843/AD7873 evaluation software.
EVALUATION BOARD DESCRIPTION
The AD7843/AD7873 evaluation board allows the user to evaluate
all features of the AD7843 and AD7873. The board is powered via
the USB connection to the host PC. The evaluation software
allows data to be read from and written to the
AD7843/AD7873. Install the evaluation software on the PC before
plugging in the board.
The evaluation board contains the following main components,
which are also shown in the functional block diagram (see
Figure 1):
• AD7843/AD7873 IC
• USB microcontroller IC, CY7C68013-CSP
• LED indicators for power and
PENIRQ
• EEPROM for USB initialization information
• Connector for USB interface
• Connector for touch screen
• Screw-top connectors for the following signals: X−, Y+,
X+, Y−, +V
CC
, V
REF
, and GND
• Test points for the following signals: DOUT, DIN, DCLK,
CS
,
PENIRQ
, BUSY, +V
CC
, and V
BAT
.
The printed circuit board (PCB) schematics are shown in Figure 6
and Figure 7.
P1-P3P4-P6P7-P9P10-P12

EVAL-AD7843EBZ

Mfr. #:
Buy EVAL-AD7843EBZ
Manufacturer:
Analog Devices Inc.
Description:
Data Conversion IC Development Tools EVAL BRD AD7843
Lifecycle:
New from this manufacturer.
Delivery:
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