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MC33771B NTC Thermistor Input Filter

Question asked by Jessica Riley on Mar 14, 2019
Latest reply on Mar 18, 2019 by Jose Alberto Reyes Morales



I am reviewing the component sizing for the MC3371B NTC thermistor input filters, following the MC3311B datasheet, section 13.2.5.  When I use the provided component values from Table 99 with the equations 17-20 to find the signal cutoff frequency, I find the bandwidth result to be much larger than the bandwidth calculated for the cell voltage measurements.


Temperature signal cutoff frequency calculation:


Cell voltage signal cutoff frequency calculation:

The datasheet notes that these bandwidths should be equal.  Is there a problem with my calculations or the values I am using?