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## TMP451-Q1 Datasheet(PDF) 10 Page - Texas Instruments

 Part # TMP451-Q1 Description TMP451-Q1 짹1째C Remote and Local Temperature Sensor With 管-Factor and Offset Correction, Series-Resistance Cancellation, and Programmable Digital Filter Download 37 Pages Scroll/Zoom 100% Manufacturer TI1 [Texas Instruments] Direct Link http://www.ti.com Logo

## TMP451-Q1 Datasheet(HTML) 10 Page - Texas Instruments

 10 / 37 page10TMP451-Q1SLOS877B – OCTOBER 2014 – REVISED JUNE 2019www.ti.comProduct Folder Links: TMP451-Q1Submit Documentation FeedbackCopyright © 2014–2019, Texas Instruments Incorporated7.3.1.1 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 = 0.43757.3.1.2 Standard 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.7.3.2 Series Resistance CancellationSeries resistance cancellation automatically eliminates the temperature error caused by the resistance of therouting to the remote transistor or by the resistors of the optional external low-pass filter. A total of up to 1 kΩ ofseries resistance can be cancelled by the TMP451-Q1 device, eliminating the need for additional characterizationand temperature offset correction. See Figure 5, Remote Temperature Error vs Series Resistance, for details onthe effects of series resistance on sensed remote temperature error.7.3.3 Differential Input CapacitanceThe TMP451-Q1 device tolerates differential input capacitance of up to 1000 pF with minimal change intemperature error. The effect of capacitance on sensed remote temperature error is shown in Figure 6, RemoteTemperature Error vs Differential Capacitance.7.3.4 FilteringRemote junction temperature sensors are usually implemented in a noisy environment. Noise is most oftencreated by fast digital signals, and it can corrupt measurements. The TMP451-Q1 device has a built-in, 65-kHzfilter on the inputs of D+ and D– to minimize the effects of noise. However, a bypass capacitor placeddifferentially across the inputs of the remote temperature sensor is recommended to make the application morerobust against unwanted coupled signals. For this capacitor, select a value of between 100 pF and 1 nF. Someapplications attain better overall accuracy with additional series resistance; however, this increased accuracy isapplication-specific. When series resistance is added, the total value should not be greater than 1 kΩ. If filteringis required, suggested component values are 100 pF and 50Ω on each input; exact values are application-specific.

## Similar Part No. - TMP451-Q1_V02

 Manufacturer Part # Datasheet Description Texas Instruments TMP451-Q1 1Mb / 37P [Old version datasheet]   짹1째C Remote and Local Temperature Sensor With 管-Factor and Offset Correction, Series-Resistance Cancellation, and Programmable Digital Filter
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## Similar Description - TMP451-Q1_V02

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