Trimming an offset voltage drift based on measurements at two temperatures

A method, comprising:

• reading a first temperature from a temperature sensor;
• measuring a first untrimmed offset voltage at the first temperature;
• reading a second temperature from the temperature sensor;
• measuring a second untrimmed offset voltage at the second temperature;
• calculating an offset voltage drift based on a difference between the first untrimmed offset voltage and the second untrimmed offset voltage and a difference between the first temperature and the second temperature;
• calculating an offset voltage drift trim using the calculated offset voltage drift;
• storing the offset voltage drift trim for application by a first digital-to-analog converter;
• calculating an offset voltage trim at the second temperature using the offset voltage drift trim at the second temperature;
• and
• storing the offset voltage trim for application by a second digital-to-analog converter.

An apparatus, comprising:

• a control circuit to:
• read a first temperature from a temperature sensor;
• measure a first untrimmed offset voltage at the first temperature;
• read a second temperature from the temperature sensor;
• measure a second untrimmed offset voltage at the second temperature;
• calculate an offset voltage drift based on a difference between the first untrimmed offset voltage and the second untrimmed offset voltage and a difference between the first temperature and the second temperature;
• calculate an offset voltage drift trim for a first digital-to-analog converter using the calculated offset voltage drift;
• store the offset voltage drift trim;
• calculate an offset voltage trim for a second digital-to-analog converter at the second temperature using the offset voltage drift trim at the second temperature;
• and
• store the offset voltage trim.