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17:25 Apr 15, 2005
English to German translations [PRO] Tech/Engineering - Automotive / Cars & Trucks
English term or phrase:big-slope counter
Persönliches Dauerthema OBD2
O2 Sensor 1/1 Big-Slope Counter
Was ist mit big-slope wohl gemeint?
Explanation: The DS1720 measures temperature by counting the number of clock cycles that an oscillator with a low temperature coefficient goes through during a gate period determined by a high temperature coefficient oscillator. The counter is preset with a base count that corresponds to –5C. If the counter reaches zero before the gate period is over, the temperature register, which is also preset to the –5C value, is incremented, indicating that the temperature is higher than –5C. At the same time, the counter is then preset with a value determined by the slope accumulator circuitry. This circuitry is needed to compensate for the parabolic behavior of the oscillators over temperature. The counter is then clocked again until it reaches zero. If the gate period is still not finished, then this process repeats.
The slope accumulator is used to compensate for the nonlinear behavior of the oscillators over temperature, yielding a high resolution temperature measurement. This is done by changing the number of counts necessary for the counter to go through for each incremental degree in temperature. To obtain the desired resolution, therefore, both the value of the counter and the number of counts per degree C (the value of the slope accumulator) at a given temperature must be known.
Read Slope [A9h]
This command reads the value of the slope counter byte from the DS1720. The next nine clock cycles will output the contents of this register.
Slope = Steilheit (Kucera und Ernst)
In o.g. Fall werden die Anzahl der Zyklen pro Temperaturänderung gezählt, was ein Maß für die Steilheit der Kurve ist.
Der Vorsatz big vor slope counter soll möglicherweise darauf hinweisen, daß nur Werte oberhalb eines Schwellenwertes gemessen werden.