AD8115AST datasheet(30/32 Pages) AD

30 / 32 page

AD8114/AD8115

Rev. B | Page 30 of 32

CONTROL THE EVALUATION BOARD FROM A PC

CLK

DATA IN

RESET

UPDATE

DGND

MOLEX 0.100" CENTER

CRIMP TERMINAL HOUSING

D-SUB 25 PIN (MALE)

14 1

EVALUATION BOARD

SIGNAL

DATA IN

RESET

UPDATE

CLK

DGND

MOLEX

TERMINAL HOUSING

D-SUB-25

The evaluation board includes Windows®-based control

software and a custom cable that connects the board’s digital

interface to the printer port of the PC. The wiring of this cable

is shown in Figure 58. The software requires Windows 3.1 or

later to operate. To install the software, insert the disk labeled

Disk 1 of 2 into the PC and run the file called SETUP.EXE.

Additional 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. Most modern PCs have only

one printer port, usually called LPT1. However some laptop

computers use the PRN port.

Figure 58. Evaluation Board-PC Connection Cable

Figure 59 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

evaluation board. An output can be turned off by clicking the

appropriate button in the off column. To turn off all outputs,

click on RESET.

OVERSHOOT OF 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.

Depending on the overshoot from the printer port, this

capacitor may need to be as large as 0.01 µF.

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

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

use parallel programming. There is no cable or software

provided with the evaluation board for parallel programming.

These are left to the user to provide.

AD8114/AD8115

Parallel Port Selection

The software offers volatile and nonvolatile storage of

configurations. 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 calculator. For nonvolatile storage of a configuration,

the save setup and load setup functions can be used. This stores

the configuration as a data file on disk.

Figure 59. Screen Display and Control Software

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