Temperature sensor application description

AN3397

12/24

Doc ID 018809 Rev 1

2.4.1

Temperature calculation theory

The voltage delivered by the TS is a linear function (linearity error ±2 °C max) of the diode

temperature junction.

Equation 3 is used depending on the reference chosen (temperature in K or temperature



in °C):

Equation 2

Equation 3

Where:

●

K is the absolute temperature

●

data register.

●

Temperature).

Equation 4

2.4.2

Operating modes

To make V90 appear in the formula, the reference has been transposed, with the origin

defined by T90/V90 has been determined for the temperature characteristic. Consequently,

the temperature formula in Equation 2 and Equation 3 becomes Equation 5.

Equation 5

The TS application may be configured in two operating modes:

●

Normal mode

●

Advanced mode

TK



V



=

T°C



V



 273.15

–

=

Avg_slope

V

 T





V90

V

SENSE

–

 T90 T

–





==

T°C



V



=