AD8108 datasheet(25/28 Pages) AD

25 / 28 page

AD8108/AD8109

–25–

REV. 0

RESET

CLK

DATA IN

DGND

UPDATE

MOLEX 0.100" CENTER

CRIMP TERMINAL HOUSING

D-SUB 25 PIN (MALE)

14 1

EVALUATION BOARD

SIGNAL

RESET

UPDATE

DATA IN

CLK

DGND

MOLEX

TERMINAL HOUSING

D-SUB-25

Figure 53. Evaluation Board-PC Connection Cable

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 54 shows the main screen of the control software in its

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

AD8108/AD8109

Figure 54. Evaluation Board Control Panel

can be connected with one or more outputs by simply clicking

on the appropriate radio buttons in the 8

× 8 on-screen array.

Each time a button is clicked on, the software automatically

sends and latches the required 32-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.

The software offers volatile and nonvolatile storage of configu-

rations. For volatile storage, up to two configurations can be

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

These function in an identical fashion 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.

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 solder-side of the evaluation board to

allow this capacitor to be soldered into place. Depending upon

the overshoot from the printer port, this capacitor may need to

be as large as 0.01

µF.

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