-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

±50

±25

0

25

50

75

100

125

150

LMT01 Junction Temperaure (

ƒC)

C017

Max Limit

Min Limit

-1.0

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

±50

±25

0

25

50

75

100

125

150

LMT01 Junction Temperaure (

ƒC)

C018

0

512

1024

1536

2048

2560

3072

3584

4096

±50 ±25

0

25

50

75

100 125 150 175 200 225

LMT01 Junction Temperature (

ƒC)

C002

12

LMT01-SP

SNIS205 – JANUARY 2019

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Product Folder Links: LMT01-SP

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Copyright © 2019, Texas Instruments Incorporated

The curve shown in Figure 20 shows the output transfer function using equation Equation 1 (blue line) and the

look-up table (LUT) found in Electrical Characteristics - Pulse Count to Temperature LUT (red line). The LMT01-

SP output transfer function as described by the LUT appears to be linear, but upon close inspection, it can be

seen as truly not linear. To actually see the difference, the accuracy obtained by the two methods must be

compared.

Figure 20. LMT01-SP Output Transfer Function

For more exact temperature readings the output pulse count can be converted to temperature using linear

interpolation of the values found in Electrical Characteristics - Pulse Count to Temperature LUT.

The curves in Figure 21 and Figure 22 show the accuracy of typical units when using the Equation 1 and linear

interpolation using Electrical Characteristics - Pulse Count to Temperature LUT, respectively. When compared,

the improved performance when using the LUT linear interpolation method can clearly be seen. For a limited

temperature range of 25°C to 80°C, the error shown in Figure 21 is flat, so the linear equation will provide good

results. For a wide temperature range, TI recommends that linear interpolation and the LUT be used.

92 Typical Units Plotted at (VP – VN) = 2.15 V

Figure 21. LMT01-SP Typical Accuracy When Using First

Order Equation, Equation 1

92 typical units plotted at (VP – VN) = 2.15 V

Figure 22. LMT01-SP Accuracy Using Linear Interpolation

of LUT Found In Electrical Characteristics - Pulse Count to

Temperature LUT

7.3.3 Current Output Conversion to Voltage

The minimum voltage drop across the LMT01-SP must be maintained at 2.15 V during the conversion cycle.

After the conversion cycle, the minimum voltage drop can decrease to 2 V. Thus the LMT01-SP can be used for

low voltage applications. See Application Information section for more information on low voltage operation and

other information on picking the actual resistor value for different applications conditions. The resistor value is

dependent on the power supply level and the variation and the threshold level requirements of the circuitry the

resistor is driving (that is, MCU, GPIO, or Comparator).