AD8115AST datasheet(25/26 Pages) AD

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AD8114/AD8115

–25–

REV. 0

Controlling the Evaluation Board from a PC

The evaluation board includes Windows

®-based control soft-

ware and a custom cable that connects the board’s digital inter-

face to the printer port of the PC. The wiring of this cable is

shown in Figure 52. The software requires Windows 3.1 or later

to operate. To install the software, insert the disk labeled “Disk

#1 of 2” in the PC and run the file called SETUP.EXE. Addi-

tional installation instructions will be given on-screen. Before

beginning installation, it is important to terminate any other

Windows applications that are running.

When you launch the crosspoint control software, you will be

asked to select the printer port you are using. Most modern PCs

have only one printer port, usually called LPT1. However some

laptop computers use the PRN port.

Figure 53 shows the main screen of the control software in its

initial reset state (all outputs off). Using the mouse, any input

can be connected with one or more outputs by simply clicking

on the appropriate radio buttons in the 16

× 16 on-screen array.

Each time a button is clicked on, the software automatically

sends and latches the required 80-bit data stream to the evalua-

tion board. An output can be turned off by clicking the appro-

priate button in the Off column. To turn off all outputs, click on

RESET.

While the computer software only supports serial programming

via a PC’s parallel port and the provided cable, the evaluation

board has a connector that can be used for parallel program-

ming. The SER/PAR signal should be at a logic high to use

parallel programming. There is no cable nor software provided

with the evaluation board for parallel programming. These are

left to the user to provide.

The software offers volatile and nonvolatile storage of configura-

tions. For volatile storage, up to two configurations can be stored

and recalled using the Memory 1 and Memory 2 Buffers. These

function in a fashion identical to the memory on a pocket calcu-

lator. For nonvolatile storage of a configuration, the Save Setup

and Load Setup functions can be used. This stores the configu-

ration as a data file on disk.

Overshoot on PC Printer Ports’ Data Lines

The data lines on some printer ports have excessive overshoot.

Overshoot on the pin that is used as the serial clock (Pin 6 on

the D-Sub-25 connector) can cause communication problems.

This overshoot can be eliminated by connecting a capacitor

from the CLK line on the evaluation board to ground. A pad

has been provided on the circuit-side (C33) of the evaluation

board to allow this capacitor to be soldered into place. Depend-

ing upon the overshoot from the printer port, this capacitor may

need to be as large as 0.01

µF.

Windows is a registered trademark of Microsoft Corporation.

AD8114/AD8115

Parallel Port Selection

Figure 53. Screen Display and Control Software

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