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The
Multifunction Bench Unit is controlled by
the ZiLOG Z8F microcontroller. The unit has
four basic functions: independent positive
and negative 0- to 15-VDC programmable power
supplies (PPS); two-channel 3-Hz to 1-MHz
pulse width modulated square wave generators
(SWG1 and SWG2); one-channel 1.5-Hz to 75-kHz
square wave generator (SWG3); two-channel
–200- to 200-V data acquisition interface
(DAI); and multiple fixed power supplies.
The PPSs and SWGs are programmed via an IrDA
serial link to the Z8F. A simple PocketC demo
Palm program was used to verify the IrDA data
transfer. (Eventually an OrbForms Palm program
will be used.) The DAI is controlled via a
parallel interface. A Visual Basic 5 program
running on a Windows 98 laptop is used to
set up the DAI and display and save the acquired
data. (The parallel interface also programs
the PPSs and SWGs.) The Z8F debug interface
is retained; it is accessible via the front
panel for software updates.
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Dave Barnard
U.S.
DJ_BARNARD@juno.com
Abstract
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