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ZSSC3281BC3R Datasheet(PDF) 39 Page - Renesas Technology Corp |
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ZSSC3281BC3R Datasheet(HTML) 39 Page - Renesas Technology Corp |
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39 / 107 page  ZSSC3281 Datasheet Rev. 1.3 FW Ver. 1.4.0 Mar.13.24 R33DS0020ED0100 Page 39 © 2024 Renesas Electronics 5.4 Bridge Output Scaling ZSSC3281 offers a linear rescaling function to amplify or compress a partial region of the sensor input range to the desired signal output range. Figure 30 illustrates the rescaling on an example where the 25% to 75% calibrated signal input range is mapped to the output range of 0% to 100%. The feature is intended for customers who need to separate product derivatives after a common sensor calibration step. Brid ge Signal 100 0 x [%] Brid ge Signal 100 0 Scaling by OutScaleGai n and Ou tScale Offset y [%] 50 75 25 SMAX SMIN SMAX SMIN Figure 30: Example: Bridge Output Scaling Function for Scaling 25% - 75%, to final 0% - 100% The rescaling feature applies the following formula to the SSC conditioned outputs of the main bridge sensor: ������ = [ ������∙������������������������������������������������������������������������ ������������������ × (������ + ������ × ������������������������������������������������������������������������������������)] ������ ������������������−������ Equation 17 The Coefficients OutScaleGain and OutScaleOffset are stored in the CCP (Configuration and Calibration Page) of ZSSC3281 in signed magnitude format. According to Table 17 OutScaleGain is limited to a maximum gain of 4 and the OutScaleOffset can vary from -1.5 to 0 related to the SSC result number range 0 to ~2. Table 17: Examples for Bridge Output Scaling Input Relative – x [%] OutScaleGain OutScaleOffset Output Relative – y [%] real CCP content (decimal) real CCP Content (decimal) 0 50.0 2.000 2097152 0.0 0 0 100 0 33.3 3.003 3148876 0.0 0 0 100 0 25.0 4.000 4194304 0.0 0 0 100 25 50.0 4.000 4194304 -0.5 -524288 0 100 25 75.0 2.000 2097152 -0.5 -524288 0 100 50 100.0 2.000 2097152 -1.0 -1048576 0 100 75 100.0 4.000 4194304 -1.5 -1572864 0 100 Table 18 lists the mapping of CCP register content to output scaling coefficients. Table 18: Data Format of Output Scaling Coefficients in CCP Bit-Number: 23 22 21 20 … 2 1 0 Meaning, Weighting 0 = positive 1 = negative 22 21 20 2-1 … 2-19 2-20 The GUI supports the calculation of OutScaleGain and OutScaleOffset based on provided relative input and output range specifications (Can be set on the GUI tab Configure\Output Scaling). |
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