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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TMP107 Fiches technique(PDF) 11 Page - Texas Instruments |
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TMP107 Fiches technique(HTML) 11 Page - Texas Instruments |
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11 / 40 page  TMP107 www.ti.com SBOS716B – MAY 2015 – REVISED SEPTEMBER 2015 7.3 Feature Description 7.3.1 Digital Temperature Output The 14-bit digital output from each temperature measurement conversion is stored in the temperature register. Read two bytes to obtain the data. Table 1 summarizes the temperature data format. Negative numbers are represented in binary twos complement format. The temperature sensor resolution is 0.015625ºC/LSB. Table 1. Temperature Data Format DIGITAL OUTPUT TEMPERATURE (°C) BINARY HEX 127.984 01 1111 1111 1111 1FFF 100 01 1001 0000 0000 1900 80 01 0100 0000 1000 1408 75 01 0010 1100 0000 12C0 50 00 1100 1000 0000 C80 25 00 0110 0100 0000 640 0.25 00 0000 0001 0000 10 0 00 0000 0000 0000 0 –0.25 11 1111 1111 0000 3FF0 –25 11 1001 1100 0000 39C0 –55 11 0010 0100 0000 3240 Use the following rules to obtain the data for a given temperature, and vice versa. • To convert positive temperatures to a digital data format: Divide the temperature by the resolution. Then, convert the result to binary code with a 14-bit, left-justified format. Example: (50°C) / (0.015625°C / LSB) = 3200 = C80h = 00 1100 1000 0000 = C80h • To convert a positive digital data format to temperature: Convert the 14-bit, left-justified, binary temperature result to a decimal number. Then, multiply the decimal number by the resolution to obtain the positive temperature. Example: 00 1100 1000 0000 = C80h = 3200 × (0.015625°C / LSB) = 50°C • To convert negative temperatures to a digital data format: Divide the absolute value of the temperature by the resolution and convert the result to binary code with a 14- bit, left-justified format. Then, generate the twos complement of the result by complementing the binary number and adding one. Example: (|–25°C|) / (0.015625°C / LSB) = 1600 = 640h = 00 0110 0100 0000 Twos complement format: 11 1001 1011 1111 + 1 = 11 1001 1100 0000 = 39C0h • To convert a negative digital data format to temperature: Generate the twos complement of the 14-bit, left-justified binary number of the temperature result by complementing the binary number and adding one. This number is the binary representation of the absolute value of the temperature. Convert to a decimal number and multiply by the resolution to obtain the absolute temperature, then multiply by –1 for the negative sign. Example: 11 1001 1100 0000 has a twos complement of 00 0110 0011 1111 + 1 = 00 0110 0100 0000 Convert to temperature: 00 0110 0100 0000 = 640h = 1600; 1600 × (0.015625°C / LSB) = 25°C = (|–25°C|); (|–25°C|) × (–1) = –25°C Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TMP107 |
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