UG-250

Evaluation Board User Guide

Rev. A | Page 6 of 12

Figure 3. Main Window

MAIN WINDOW

As can be seen in Figure 3, the main window is made up of

5 tabs; Control Register, DAC Register, Fault Register,

Program Loop Current, and Command Write. Outside

of the tab structure at the top right of the window are two

control items; LDAC PIN to set the state of the LDAC pin

and USE PEC to select whether packet error checking is used

in the communications with the AD5421. There is also an

indicator item; PEC Error, this alerts to a packet error in the

data received from the AD5421. At the bottom of the window

is a display of the contents of the fault register, this is updated

on every communication with the AD5421 if Auto Fault

Readback is enabled.

Control Register

The Control Register tab is displayed by default. This tab

allows the user to program the control register.

DAC Register

The DAC Register tab allows the user to program the DAC

register, offset adjust register, and gain adjust register.

Fault Register

The Fault Register tab allows the user to read the contents

of the fault register. The fault register can also be polled

continuously.

Program Loop Current

The Program Loop Current tab allows the user to program a

loop current value directly by entering the value in milliamps

after having first selected the loop current range that is set by

the Range0 and Range1 link options.

Command Write

The Command Write tab allows the user to read/write all of the

AD5421s registers as well as issue commands.