SBOA433 March   2021 TMP451 , TMP461 , TMP461-SP , TMP464 , TMP468 , TMP4718 , TMP9R00-SP

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Series Resistance
    2. 1.2 Variation of η-Factor
    3. 1.3 Variation of Beta
  3. 2Transistor List
  4. 3BJT Test Board
  5. 4Test Procedure
  6. 5Data and Recommendations
  7. 6Summary

Variation of η-Factor

Remote temperature sensors are typically calibrated for transistors with an η-factor of 1.008, but transistors may have η-factors that differ from this. If the value is known, an η-factor correction register can be used to correct the error resulting from a deviation of the calibrated η-factor. A combination of offset and η-factor correction settings can correct for both η-factor errors and other system errors that are present. The Remote Temperature Sensor Calibration Tool can calculate the optimal offset and η-factor correction settings for a given data set, and these register settings can be used with devices such as the TMP468, which includes an independent register for each remote input.