Datasheet

AD8106/AD8107
Rev. 0 | Page 25 of 28
CONTROLLING THE EVALUATION BOARD
FROM A PC
When launching the crosspoint control software, users are
asked to select their desired printer port. Most modern PCs
have only one printer port, usually called LPT1. However, some
laptop computers use the PRN port.
The evaluation board includes Windows-based control software
and a custom cable that connects the board’s digital interface to
the printer port of a PC. The wiring of this cable is shown in
Figure 56 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 × 8 on-screen array.
Each time a button is clicked on, the software automatically sends
and latches the required 40-bit data stream to the evaluation board.
An output can be turned off by clicking the appropriate button
in the off column. To turn all outputs on, click
Figure 55. The software requires Windows 3.1 or later to operate.
Before the start of the installation, terminate any other Windows
applications that are running. To install the software, insert
the disk labeled Disk #1 of 2 in the PC and run the setup.exe file.
Additional installation instructions are given on-screen.
CLK
DATA IN
RESET
UPDATE
CE
DGND
MOLEX 0.100" CENTER
CRIMP TERMINAL HOUSING
1
6
D-SUB 25 PIN (MALE)
14
1
25
13
EVALUATION BOARD PC
2
3
4
5
6
25
3
1
4
5
2
6
SIGNAL
DATA IN
CE
RESET
UPDATE
CLK
DGND
MOLEX
TERMINAL HOUSINGD-SUB-25
05774-056
RESET
.
The software offers volatile and nonvolatile configuration
storage. For volatile storage, up to two configurations can be
stored and recalled using the Memory 1 Buffer and Memory 2
Buffer. 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.
DATA-LINE OVERSHOOT ON PRINTER PORTS
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.
Figure 55. Evaluation Board PC Connection Cable