AN206 查看數據表（PDF） - Vishay Semiconductors
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AN206 Datasheet PDF : 3 Pages
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AN206
Vishay Siliconix
R17
VREF
R18
Programmable
VOUT to
Monitor
From mC
Counter
Frequency
Out to
R32
Monitor
DG406
Clock
From mC
FIGURE 4. Saturated Oxygen Simulation Circuit
FIGURE 5. Pulse Rate Simulator
The pulse rate parameter was simulated by varying the
frequency of a square wave obtained from a programmable
timer/counter. The timer/counter was programmed using
some of the microcontroller I/O lines. The square wave
frequency represents the patient’s pulse rate.
Conclusion
The finished simulator met all design goals. The DG406
worked as documented in the Vishay Siliconix data book.
Although this design used lower resistor values and digital pots
to compensate for the rDS(on), this may not be necessary in
other less sensitive designs.
The critical components in this design were the
microncontroller for its speed and numerous on-board
devices, the analog multiplexer for its low rDS(on), and the
digital potentionmeters. Considerable time was spent
shopping around for these three devices. Viewing from the
better than expected results of the overall design, it is obvious
that the time spent in search of these devices was well worth
it.
Document Number: 70604
10-Aug-99
www.vishay.com S FaxBack 408-970-5600
6-3
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