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TMP442 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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TMP442 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 29 page Standard Binary to Decimal Temperature Data Standard Decimal to Binary Temperature Data TMP441 TMP442 SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 .............................................................................................................................................. www.ti.com Both local and remote temperature data use two Calculation Example bytes for data storage. The high byte stores the temperature with 1°C resolution. The second or low High byte conversion (for example, 0111 0011): byte stores the decimal fraction value of the Convert the right-justified binary high byte to temperature and allows a higher measurement hexadecimal. resolution, as shown in Table 2. The measurement From hexadecimal, multiply the first number by resolution for both the local and remote channels is 160 = 1 and the second number by 161 = 16. 0.0625°C, and cannot be adjusted. The sum equals the decimal equivalent. Table 2. Decimal Fraction Temperature Data 0111 0011b → 73h → (3 × 160) + (7 × 161) = 115 Format (Local and Remote Temperature Low Low byte conversion (for example, 0111 0000): Bytes) To convert the left-justified binary low-byte to TEMPERATURE REGISTER LOW BYTE decimal, use bits 7 through 4 and ignore bits 3 VALUE (0.0625°C RESOLUTION)(1) through 0 because they do not affect the value of the number. TEMP STANDARD AND EXTENDED (°C) BINARY HEX 0111b → (0 × 1/2)1 + (1 × 1/2)2 + 0 0000 0000 00 (1 × 1/2)3 + (1 × 1/2)4 = 0.4375 0.0625 0001 0000 10 Note that the final numerical result is the sum of the 0.1250 0010 0000 20 high byte and low byte. In negative temperatures, the 0.1875 0011 0000 30 unsigned low byte adds to the negative high byte to result in a value more than the high byte (for 0.2500 0100 0000 40 instance, –15 + 0.75 = –14.25, not –15.75). 0.3125 0101 0000 50 0.3750 0110 0000 60 0.4375 0111 0000 70 Calculation Example 0.5000 1000 0000 80 For positive temperatures (for example, +20°C): 0.5625 1001 0000 90 (+20°C)/(1°C/count) = 20 → 14h → 0001 0100 0.6250 1010 0000 A0 Convert the number to binary code with 8-bit, 0.6875 1011 0000 B0 right-justified format, and MSB = '0' to denote a 0.7500 1100 0000 C0 positive sign. 0.8125 1101 0000 D0 +20°C is stored as 0001 0100 → 14h. 0.8750 1110 0000 E0 For negative temperatures (for example, –20°C): 0.9375 1111 0000 F0 (|–20°C|)/(1°C/count) = 20 → 14h → 0001 0100 (1) Resolution is 0.0625°C/count. All possible values are shown. Generate the twos complement of a negative number by complementing the absolute value binary number and adding 1. –20°C is stored as 1110 1100 → ECh. 10 Submit Documentation Feedback Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Link(s): TMP441 TMP442 |
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