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AN677 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN677 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 14 page 4 A SMART SENSOR WITH NON-LINEAR RESPONSE AND AUTOCALIBRATION In the case of a non-calibrated sensor, or of mechanical drift of the input system, the meanpoint value may be slightly different from the theoretical reference value and subsequently induce some unwanted actions on the outputs. One solution is to perform an autozero process allowing a tolerance window for the meanpoint, as represented on the flowchart in Figure 6: As long as the initial value at reset is within a tolerance window around the theoretical value of 127, the shift is considered as irrelevant and that initial value is used as the new reference; On the contrary, any input value out of this tolerance window is understood as an instruction request to use 127 as the reference value. Figure 6: Flowchart Of The Autozero Process At Reset Output = 00 Input Value in Tolerance Window Store Input Value as Reference Store Default Value 127 as Reference Output = Input - Reference No Yes 9/14 |
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