Detailed Description of Software

Graphic User Interface (GUI) Panel

The MAX5422 EV kit software GUI shown in Figure 1 is

a Windows program that provides a convenient means

to control the MAX5422. Use the mouse or press the

tab key to navigate through the GUI controls. The cor-

rect SPI write operation is generated to update the

MAX5422 internal memory registers when any of these

controls are executed.

The software divides EV kit functions into logical blocks.

The Interface group box indicates the EV kit Status

and the last write operation Command Sent and Data

Sent indicators. This data is used to confirm proper

device operation. The Potentiometer Control group

box changes the wiper position, stores the wiper posi-

tion from the volatile memory to the nonvolatile memory,

and recalls the wiper position from the nonvolatile mem-

ory to the volatile memory. The bottom status bar of

the main window provides the USB interface circuit

communication status. The Factory Default button pro-

grams the volatile and nonvolatile memory of the poten-

tiometer to midscale position.

Software Startup

Upon startup, the MAX5422 EV kit software automati-

cally searches for the USB interface circuit connection.

The MAX5422 EV kit enters the normal operating mode

when the USB connection is detected. The nonvolatile

memory wiper position is then transferred to the volatile

memory. Since the MAX5422 does not have read capa-

bility, all the spin boxes are set to question marks “??”

and the track bar is set to midscale. If the USB connec-

tion is not detected, the software prompts the user to

retry, exit the program, or enter the demo mode.

Demo Mode

The MAX5422 EV kit software enters the demo mode,

when the USB connection is not detected, by selecting

Cancel on the MAX5422 Evaluation Kit Interface

Circuit popup window (Figure 2). The software can also

enter demo mode at any time by selecting Options |

Demo Mode from the menu bar in the main window.

When in demo mode, all software communication to the

EV kit circuit is disabled; however, most of the software

GUI is functional. Demo mode allows the user to evaluate

the software without hardware connectivity. To exit demo

mode, select Options | Demo Mode from the menu bar.

MAX5422 Evaluation Kit

4

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Figure 1. MAX5422 Evaluation Kit Software Main Window

Figure 2. MAX5422 Evaluation Kit Interface Circuit Popup Window