STLM20W87F 데이터 시트보기 (PDF) - STMicroelectronics

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STLM20W87F

Ultra-low Current 2.4V precision analog temperature sensor

STMicroelectronics 

STLM20

2

Transfer function

Transfer function

The STLM20’s transfer function can be described in different ways, with varying levels of

precision. A simple linear transfer function, with good accuracy near 25°C is expressed as:

Equation 1

VO = (–11∴69mV) ⁄ ° C × T + 1∴8663V

Over the specified operating temperature range, the best accuracy can be obtained by using

the parabolic transfer function:

Equation 2

VO = (–3∴88 × 10–6 × T2) + (–1∴15 × 10–2 × T) + 1∴8639

and solving for T:

Equation 3

T = – 1481∴96 + 2∴1962 × 106 + (---1---∴--8---6---3---9-----–----V----O----)-

3∴88 × 10–6

The best fit linear transfer function for many popular temperature ranges was calculated in

Table 2, where the error introduced by the linear transfer function increases with wider

temperature ranges.

Table 2. First order equations optimized for different temperature ranges

Temperature range

Tmin (°C) Tmax (°C)

Linear equation

VO =

Maximum deviation of linear

equation from parabolic equation

(°C)

–55

130

–11.79mV/°C * T + 1.8528V

±1.41

–40

110

–11.77mV/°C * T + 1.8577V

±0.93

–30

100

–11.77mV/°C * T + 1.8605V

±0.70

–40

85

–11.67mV/°C * T + 1.8583V

±0.65

–10

65

–11.71mV/°C * T + 1.8641V

±0.23

35

45

–11.81mV/°C * T + 1.8701V

±0.004

20

30

–11.69mV/°C * T + 1.8663V

±0.004

7/17

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