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TLE4942-2 Datasheet(PDF) 2 Page - Infineon Technologies AG |
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TLE4942-2 Datasheet(HTML) 2 Page - Infineon Technologies AG |
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2 / 9 page  TLE4942-2, TLE4942-2C Supplement TLE4942-2 - TLE4942-2C Data sheet supplement February 2002 2 1 Functional description offset correction peak detection offset= (m ax + min) / 2 uncalibrated mode calibrated mode d1 initial settling time d1 d2 d2 d2 standstill pulse (cut off) PGA switching 0 1 2 3 4 5 6 7 Fig. 1: example for start-up behaviour Uncalibrated mode: Occasionally a short initial offset settling time td,input might delay the detection of the input signal. (The sensor is "blind"). The magnetic input signal is tracked by the speed ADC and monitored within the digital circuit. For detection the signal transient needs to exceed a threshold (digital noise constant d1). When the signal slope is identified as a rising edge (or falling edge), a comparator is triggered. The comparator is triggered again as soon as a falling edge (or rising edge respectively) is detected (and vice versa). Depending on the initial state of the comparator the IC output is first triggerd on the first or second detected edge. Between the startup of the magnetic input signal and the time when its second extreme is reached, the PGA (programmable gain amplifier) will switch to its appropriate position. This value is determined by the signal amplitude and initial offset value. The digital noise constant value is changing accordingly (d1 → d2), leading to a change in phase shift between magnetic input signal and output signal. After that consecutive output pulses should have a nominal delay of about 180°. During the uncalibrated mode the offset value is calculated by the peak detection algorithm as described in the TLE4942 data sheet. Transition to calibrated mode: In the calibrated mode the phase shift between input and output signal is no longer determined by the ratio between digital noise constant and signal amplitude. Therefore a sudden change in the phase shift may occur during the transition from uncalibrated to calibrated mode. |
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