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TMP104YFFT データシート(PDF) 11 Page - Texas Instruments |
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TMP104YFFT データシート(HTML) 11 Page - Texas Instruments |
11 / 24 page TMP104 www.ti.com SBOS564A – NOVEMBER 2011 – REVISED NOVEMBER 2011 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. Table 5. 8-Bit Temperature Data Format(1) DIGITAL OUTPUT TEMPERATURE ( °C) BINARY HEX 128 0111 1111 7F 127 0111 1111 7F 100 0110 0100 64 80 0101 0000 50 75 0100 1011 4B 50 0011 0010 32 25 0001 1001 19 0 0000 0000 00 –1 1111 1111 FF –25 1110 0111 E7 –55 1100 1001 C9 (1) The resolution for the analog-to-digital converter (ADC) is 1 °C/count, where count is equal to the digital output of the ADC. For positive temperatures (for example, +50 °C): Twos complement is not performed on positive numbers. Therefore, simply convert the number to binary code, left-justified format. Denote a positive number with most significant bit (MSB) = 0. Example: (+50 °C)/(1°C/count) = 50 = 32h = 0011 0010 For negative temperatures (for example, –25°C): Generate the twos complement of a negative number by complementing the absolute value binary number and adding 1. Denote a negative number with MSB = 1. Example: (| –25°C|)/(1°C/count) = 25 = 19h = 0001 1001 Twos complement format: 1110 0110 + 1 = 1110 0111 Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TMP104 |
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