Temperature detection cell, and method to determine the detection threshold of such a cell

A method for determining a detection threshold for each temperature detection cell in a series of temperature detection cells coming from a same manufacturing process, each temperature detection cell comprising a first temperature circuit for producing an increasing voltage as a function of temperature, a second temperature circuit for producing a decreasing voltage as a function of the temperature, and a comparison circuit for providing a warning signal when the increasing voltage reaches the decreasing voltage signifying that the detection threshold has been reached, the method comprising:

• during a resetting step, determining a plurality of constant coefficients related to the series of temperature detection cells;
• and
• during a testing step, determining the detection threshold of each temperature detection cell based upon measurements of the increasing voltage and the decreasing voltage at a reference temperature and the plurality of temperature coefficients.

A method for determining a detection threshold for each temperature detection cell in a series of temperature detection cells coming from a same manufacturing process, each temperature detection cell comprising a first temperature circuit for producing an increasing voltage as a function of temperature, a second temperature circuit for producing a decreasing voltage as a function of the temperature, and a comparison circuit for providing a warning signal when the increasing voltage reaches the decreasing voltage signifying that the detection threshold has been reached, the method comprising:

• during a resetting step, determining a plurality of constant coefficients X and Y related to the series of temperature detection cells;
• and
• during a testing step, determining the detection threshold TD of each temperature detection cell based upon measurements of the increasing voltage VS1 and the decreasing voltage VS2 at a reference temperature T0 and the plurality of temperature coefficients X and Y, the detection threshold TD being computed according to the relationship TD=T0+(VS2−VS1)/(X−Y).