MAX5474EVKIT+【PDF 6/11 页】KIT EVAL FOR MAX5474

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MAX5474 Evaluation Kit

Detailed Description of Software

The MAX5474 EV kit software graphical user interface

(GUI) is a Windows program that provides a convenient

means to control the MAX5474, as shown in Figure 1.

Text in bold denotes user-selectable features in the

MAX5474 EV kit software. A mouse or the keyboard’s

TAB key is used to navigate various items on the main

window. The bottom left-side status bar of the main win-

dow provides the USB interface circuit communication

status. The bottom right-side status bar indicates the

presence or absence of the MAX5474 IC and opera-

tional status.

Software Startup

Upon starting the program, the MAX5474 EV kit soft-

ware automatically detects for the USB and interface

circuit connection. The MAX5474 EV kit enters normal

operating mode when the USB connection is detected.

The software Wiper Position and Wiper Input are ini-

tialized to midscale position at startup. Software initial-

ization sets the volatile register of the MAX5474 IC to

midscale. The NV memory remains unchanged. If the

USB connection is not detected, the software prompts

the user to retry, exit the program, or enter the demo

mode.

Demo Mode

The MAX5474 EV kit software can enter the demo

mode, when the USB connection is not detected, by

pressing the Cancel button in the MAX5474 Evaluation

Kit Interface Circuit Popup Window (Figure 2). The soft-

ware can also enter the demo mode at any time using

the Options | Demo Mode pulldown menu item in the

software main window. When in demo mode, all soft-

ware 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 again from the pulldown menu.

Note: When reentering normal operating mode from the

demo mode, the MAX5474 wiper position must be

reset. Reset the wiper by pressing the Reset button.

See the Nonvolatile Memory section for more details.

Figure 2. MAX5474 Evaluation Kit Interface Circuit Popup Window

Wiper Position

Moving the Wiper Position track bar will update and

display the MAX5474 wiper position. Pressing the

Store button stores the MAX5474 wiper to the non-

volatile memory. Pressing the Reset button synchro-

nizes the software and wiper position by returning the

MAX5474 wiper to the midscale position.

The Wiper Input combo box accepts and displays a

number between 1 and 32 for the wiper input. The

Wiper Input also features a drop-down menu that

stores the last four user entries. After pressing the

Store button, the Wiper Stored edit box displays the

MAX5474 IC’s stored wiper position, and is read only.

Up and Down

Pressing the Up button increments the wiper one tap

position, while pressing the Down button decrements

the wiper one tap position. These buttons also move

the Wiper Position track bar to the respective position.

Nonvolatile Memory

The MAX5474 wiper position is stored in nonvolatile

memory when the Store button is pressed. The

MAX5474 wiper returns to this position upon power-up.

To demonstrate the nonvolatile memory feature in soft-

ware operation, press the Store button to store the

wiper position to the nonvolatile memory. Power cycle

the EV kit by removing the shunt from jumper JU1 and

reinstalling the shunt after 5s or longer (to allow dis-

charge of bypass capacitors). Do not restart the soft-

ware. Use an ohmmeter to verify the resistance

between the L and W PCB pads.

Perform a Reset to synchronize the software and

MAX5474 IC wiper position. Pressing the Reset button

does not overwrite the MAX5474 nonvolatile memory.

Factory Default

Pressing the Factory Default button resets the wiper

position in the MAX5474 volatile and nonvolatile memo-

ry to the factory-default position. The factory-default

wiper position in the volatile and nonvolatile memory is

at midscale.

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