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Functional description
Microprocessor unit
As processor, Intel's 80C196KC-16 is used. There are external memories, an 8-bit data bus, a 16
MHz oscillator, within the processor there is an open collector reset, and a watchdog timer. Two
A/D-converters within the processor are used. The processor's internal UART communicates with
the CPU board.
High speed I/O is used to obtain pulse control sequence necessary for pulse oximetry
measurement.
Temperature measurement unit
Value of NTC-resistor in the probe depends on patient's temperature. It is measured with the
following principle.
The temperature signal is produced by voltage dividers, part of which is the patient probe (YSI 400-
series thermistor). The output is amplified by the calibrated amplifier whose offset voltage makes
its output spread on both sides of zero. Wider output range (measurement range) means better
resolution.
NTC
to AD
converter
+5Vreference
offset
A1
0 °C => 7K357
15 °C => 3K541
25 °C => 2K253
38 °C => 1K301
45 °C => 984R1
Figure 7
Temperature measurement block diagram
Invasive blood pressure measurement unit
Isolated and current l5 V voltage is supplied to the pressure transducer. A differential
voltage, which depends on pressure and supplied voltage, is calculated from the bridge connection
(see the formula below).
Uout = Uref
×
pressure
×
5 [
µ
V/mmHg]
where Uref = 5 V
Uout = 25
×
pressure [
µ
V/mmHg]
Pressure amplification is realized in the instrumentation amplifier. Gain of the amplifier is set so
that the level of the signal transferred to the A/D converter stays within the measurement range
even when there are circumstantial offsets or offsets caused by the transducer. There is a filter
before the amplifier to attenuate high frequency disturbances.
Document No. 8000060-1
15
Summary of Contents for F-LM1
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