LMP91000

SNAS506I – JANUARY 2011 – REVISED DECEMBER 2014

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Feature Description (continued)

Table 1. Temperature Sensor Transfer (continued)

TEMPERATURE

OUTPUT VOLTAGE

TEMPERATURE

OUTPUT VOLTAGE

(°C)

(mV)

(°C)

(mV)

21

1391

84

870

22

1383

85

861

Although the temperature sensor is very linear, its response does have a slight downward parabolic shape. This

shape is very accurately reflected in Table 1. For a linear approximation, a line can easily be calculated over the

desired temperature range from Table 1 using the two-point equation:

where

•

•

(1)

For example, to determine the equation of a line over a temperature range of 20°C to 50°C, proceed as follows:

V-1399mV=((1154 mV - 1399 mV)/(50°C -20°C))*(T-20°C)

(2)

V-1399mV= -8.16 mV/°C*(T-20°C)

(3)

V=(-8.16 mV/°C)*T+1562.2 mV

(4)

Using this method of linear approximation, the transfer function can be approximated for one or more

temperature ranges of interest.

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