DS2422 Trim Procedure and Software Correction

Abstract: Before it can accurately measure temperatures, the DS2422 needs to undergo a two-point trim. For the highest level of accuracy, this trim needs to take place as late as possible, i.e., with the end product that the DS2422 resides in. The accuracy can be further improved through software correction if actual values and temperature readings of the DS2422 at additional temperature points are stored in the calibration memory. This application note describes how to perform the trim, how to obtain, format and store the data for the software correction and how to perform the software correction. A spreadsheet with calculations and format conversions used in this application note can be downloaded from www.ibutton.com.
DS2422 Trim Procedure and Software Correction
By:Bernhard Linke, Principal Member Technical Staff
Dec 08, 2003

Abstract: Before it can accurately measure temperatures, the DS2422 needs to undergo a two-point trim. For the highest level of
accuracy, this trim needs to take place as late as possible, i.e., with the end product that the DS2422 resides in. The accuracy can
be further improved through software correction if actual values and temperature readings of the DS2422 at additional temperature
points are stored in the calibration memory. This application note describes how to perform the trim, how to obtain, format and
store the data for the software correction and how to perform the software correction. A spreadsheet with calculations and format
conversions used in this application no