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## TMP451 Datasheet(PDF) 9 Page - Texas Instruments

 Part # TMP451 Description 짹1째C Remote and Local Temperature Sensor with 管-Factor and Offset Correction Download 27 Pages Scroll/Zoom 100% Manufacturer TI [Texas Instruments] Direct Link http://www.ti.com Logo

## TMP451 Datasheet(HTML) 9 Page - Texas Instruments

 9 / 27 pageTMP451www.ti.comSBOS686 – JUNE 2013Both local and remote temperature data use two bytes for data storage. The high byte stores the temperaturewith 1°C resolution. The second or low byte stores the decimal fraction value of the temperature and allows ahigher measurement resolution, as shown in Table 2. The measurement resolution for both the local and theremote channels is 0.0625°C.Table 2. Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes)TEMPERATURE REGISTER LOW BYTE VALUE(0.0625°C RESOLUTION)(1)TEMP(°C)STANDARD AND EXTENDED BINARYHEX00000 0000000.06250001 0000100.12500010 0000200.18750011 0000300.25000100 0000400.31250101 0000500.37500110 0000600.43750111 0000700.50001000 0000800.56251001 0000900.62501010 0000A00.68751011 0000B00.75001100 0000C00.81251101 0000D00.87501110 0000E00.93851111 0000F0(1) Resolution is 0.0625°C/count. All possible values are shown.Standard Binary to Decimal Temperature Data Calculation ExampleHigh-byte conversion (for example, 0111 0011):Convert the right-justified binary high byte to hexadecimal.From hexadecimal, multiply the first number by 160 = 1 and the second number by 161 = 16.The sum equals the decimal equivalent.0111 0011b→ 73h → (3 × 160) + (7 × 161) = 115Low-byte conversion (for example, 0111 0000):To convert the left-justified binary low-byte to decimal, use bits 7 through 4 and ignore bits 3 through 0because they do not affect the value of the number.0111b→ (0 × 1/2)1 + (1 × 1/2)2 + (1 × 1/2)3 + (1 × 1/2)4 = 0.4375Standard Decimal to Binary Temperature Data Calculation ExampleFor positive temperatures (for example, +20°C):(+20°C)/(+1°C/count) = 20→ 14h → 0001 0100Convert the number to binary code with 8-bit, right-justified format, and MSB = '0' to denote a positive sign.+20°C is stored as 0001 0100→ 14h.For negative temperatures (for example, –20°C):(|–20|)/(+1°C/count) = 20→ 14h → 0001 0100Generate the two's complement of a negative number by complementing the absolute value binary numberand adding 1.–20°C is stored as 1110 1100→ ECh.Copyright © 2013, Texas Instruments IncorporatedSubmit Documentation Feedback9Product Folder Links: TMP451

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