AD8150AST datasheet(22/35 Pages) AD

22 / 35 page

AD8150

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After running the software, the user will be prompted to identify

which (of three) software driver is used with the PC’s parallel

port. The default is LPT1, which is most commonly used. How-

ever, some laptops commonly use the PRN driver. It is also

possible that some systems are conﬁgured with the LPT2 driver.

If it is not known which driver is used, it is best to select LPT1

and proceed to the next screen. This will show a full array of

“buttons” that allows the connection of any input to output of

the AD8150. All of the outputs should be in the output “OFF”

state right after the program starts running. Any of the active

buttons can be selected with a mouse click which will send out

one burst of programming data.

After this, the PC keyboard’s left or right arrow keyboard key

can be held down to generate a steady stream of programming

signals out of the parallel port. The CLOCK test point on the

AD8150 evaluation board can be monitored with an oscilloscope

for any activity (user-supplied printer cable must be connected).

If there is a square-wave present, then the proper software driver

is selected for the PC’s parallel port.

If there is no signal present, then another driver should be tried

by selecting the Parallel Port menu item under the “File” pull-

down menu selection just under the title bar. Select a different

software driver and carry out the above test until signal activity

is present at the CLOCK test point.

Software Operation

Any button can be clicked in the matrix to program the input

to output connection. This will send the proper programming

sequence out the PC parallel port. Since only one input can be

programmed to a given output at one time, clicking a button in

a horizontal row will cancel the other selection that is already

selected in that row. However, any number of outputs can share

the same input. Refer to Figure 40.

A shortcut for programming all outputs to the same input is to

use the broadcast feature. After clicking on the Broadcast Con-

nection button, a window will appear that will prompt for the

user to select which input should be connected to all outputs.

The user should type in an integer from 0 to 32 and then click

on OK. This will send out the proper program data and return

to the main screen with a full column of buttons selected under

the chosen input.

The Off column can be used to disable to whichever output one

chooses. To disable all outputs, the Global Reset button can be

clicked. This will select the full column of OFF buttons.

Two scratchpad memories (Memory 1 and Memory 2) are pro-

vided to conveniently save a particular conﬁguration. However,

these registers are erased when the program is terminated. For

long-term storage of conﬁgurations, the disk-storage memory

should be used. The Save and Load selections can be accessed

from the “File” pull-down menu under the title bar.

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