General Overview; How To Get Started; Powering Options; How To Use Software Interface - Analog Devices AD5258 User Manual

Evaluation Board User Manual

General Overview

This evaluation board provides the user with a simple and quick solution to evaluate digital potentiometers from
Analog Devices.

How to Get Started

1. Load the CD and click on setup.exe.
2. Use power from the parallel port or apply an external power
damaging the part and computer port).
3. Connect board to parallel port with the provided connector and cable.
4. Open the AD5258/59Eval_RevX program from the Windows Start menu.

Powering Options

A. Using the power from the parallel port.
1. Connect JPVDD jumper. This will power V
2. Connect JPVLOGIC jumper. This will power V
B. Using an external power supply(supply must be at least +2.7V)*
1. DO NOT connect JPVDD and JPLOGIC jumpers.
2. Connect JPPOWER jumper.
3. Connect voltage supply power and ground to the V
*If two independent supplies are being for V
supplies to V , V
DD LOGIC

How to Use Software Interface

1. In the 'Enter Data' box, either type in the value, use the scroll bar, or click a preset button. Note that this is
simply a data entry box and does not perform any function on the digital potentiometer device.
Communication with the device occurs in Steps 2 and 3.
2. In the 'Write/Restore/Store' box...
i. Click on 'Write to RDAC' to write value chosen in Step 1 to the RDAC.
ii. Click on 'Write to EEMEM' to write value chosen in Step 1 to the EEMEM.
iii. Click on 'Restore EEMEM Content to RDAC' to restore current EEMEM content to RDAC.
iv. Click on 'Store RDAC Content to EEMEM' to store current RDAC setting to EEMEM.
3. In the 'Read Data' box...
i. Click on 'Read from RDAC' to read back current setting of RDAC.
ii. Click on 'Read EEMEM' to read back current content of EEMEM.
iii. Click on 'Read Tolerance' to read back the tolerance of the resistance R
device is the device is a 10kΩ option and the tolerance readback is 3.5%, that would mean the actual
value of R
AB
Rev. C 11/23/04
and V
DD
, and GND pads on the board.
= 10,350Ω.
64/256-Position I
Nonvolatile Memory
Digital Potentiometer
supply(refer to "Powering Options" to avoid
.
DD
.
LOGIC
and GND pads on the board.
DD
, do not connect JPPOWER. Simply apply the two power
LOGIC
2
C Compatible
AD5258/AD5259
. For example, if the
AB