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LMT01 Datasheet(PDF) 11 Page - Texas Instruments |
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LMT01 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 23 page PC Temp 256 C 50 C 4096 § · u q q ¨ ¸ © ¹ Power Off 54ms max Pulse Train Start of next conversion result data 50ms max End of data Power Start of data transmission End of data 104ms max 50ms max Power ON 11 LMT01-SP www.ti.com SNIS205 – JANUARY 2019 Product Folder Links: LMT01-SP Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Feature Description (continued) Figure 19. Temperature to Digital Pulse Train Timing Cycle 7.3.2 Output Transfer Function The LMT01-SP outputs at minimum 1 pulse and a theoretical maximum 4095 pulses. Each pulse has a weight of 0.0625°C. One pulse corresponds to a temperature less than –50°C while a pulse count of 4096 corresponds to a temperature greater than 200°C. Note that the LMT01-SP is only ensured to operate up to 125°C, but is functional up to 150°C. Exceeding this temperature by more than 5°C may damage the device. The accuracy of the device degrades as well when 125°C is exceeded. Two different methods of converting the pulse count to a temperature value are discussed in this section. The first method is the least accurate and uses a first order equation, and the second method is the most accurate and uses linear interpolation of the values found in the look-up table (LUT) as described in Electrical Characteristics - Pulse Count to Temperature LUT. The output transfer function appears to be linear and can be approximated by Equation 1: where • PC is the Pulse Count • Temp is the temperature reading (1) Table 1 shows some sample calculations using Equation 1. Table 1. Sample Calculations Using Equation 1 TEMPERATURE (°C) NUMBER OF PULSES –49.9375 1 –49.875 2 –40 160 –20 480 0 800 30 1280 50 1600 100 2400 150 3200 |
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