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TMP108AIYFFT Scheda tecnica(PDF) 7 Page - Texas Instruments |
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TMP108AIYFFT Scheda tecnica(HTML) 7 Page - Texas Instruments |
7 / 19 page TMP108 www.ti.com SBOS663 – APRIL 2013 TEMPERATURE REGISTER The temperature register is configured as a 12-bit, read-only register that stores the output of the most recent conversion. Two bytes must be read to obtain data, as shown in Table 3 and Table 4. Note that byte 1 is the most significant byte, followed by byte 2, the least significant byte. The first 12 bits are used to indicate temperature. There is no requirement to read the least significant byte if that information is not needed (for example, for resolution lower than 1°C). Table 5 summarizes the temperature data format. One LSB equals 0.0625°C. Negative numbers are represented in binary twos complement format. Following power-up or reset, the temperature register reads 0°C until the first conversion is complete. The unused bits in the temperature register always read '0'. Table 3. Byte 1 of Temperature Register D7 D6 D5 D4 D3 D2 D1 D0 T11 T10 T9 T8 T7 T6 T5 T4 Table 4. Byte 2 of Temperature Register D7 D6 D5 D4 D3 D2 D1 D0 T3 T2 T1 T0 0 0 0 0 Table 5. Temperature Data Format(1) DIGITAL OUTPUT TEMPERATURE (°C) BINARY HEX 128 0111 1111 1111 7FF 127.9375 0111 1111 1111 7FF 100 0110 0100 0000 640 80 0101 0000 0000 500 75 0100 1011 0000 4B0 50 0011 0010 0000 320 25 0001 1001 0000 190 0.25 0000 0000 0100 004 0 0000 0000 0000 000 –0.25 1111 1111 1100 FFC –25 1110 0111 0000 E70 –55 1100 1001 0000 C90 (1) The temperature sensor ADC resolution is 0.0625°C/count. Table 5 does not supply a full list of all temperatures. Use the following rules to obtain the digital data format for a given temperature. To convert positive temperatures to a digital data format: Divide the temperature by the resolution. Then, convert the result to binary code with a 12-bit, left-justified format, and MSB = 0 to denote a positive sign. Example: (+50°C)/(0.0625°C/count) = 800 = 320h = 0011 0010 0000 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 12-bit, left-justified format. Then, generate the twos complement of the result by complementing the binary number and adding one. Denote a negative number with MSB = 1. Example: (|–25°C|)/(0.0625°C/count) = 400 = 190h = 0001 1001 0000 Twos complement format: 1110 0110 1111 + 1 = 1110 0111 0000 Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TMP108 |
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