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TMP451JQDQFTQ1 Datasheet(PDF) 10 Page - Texas Instruments

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Part # TMP451JQDQFTQ1
Description  짹1째C Remote and Local Temperature Sensor With 管-Factor and Offset Correction, Series-Resistance Cancellation, and Programmable Digital Filter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TMP451JQDQFTQ1 Datasheet(HTML) 10 Page - Texas Instruments

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TMP451-Q1
SLOS877B – OCTOBER 2014 – REVISED JUNE 2019
www.ti.com
Product Folder Links: TMP451-Q1
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Copyright © 2014–2019, Texas Instruments Incorporated
7.3.1.1 Standard Binary to Decimal Temperature Data Calculation Example
High-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) = 115
Low-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 0
because 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 = 0.4375
7.3.1.2 Standard Decimal to Binary Temperature Data Calculation Example
For positive temperatures (for example, 20°C):
(20°C) / (1°C/count) = 20
→ 14h → 0001 0100
Convert 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 0100
Generate the two's complement of a negative number by complementing the absolute value binary number
and adding 1.
–20°C is stored as 1110 1100
→ ECh.
7.3.2 Series Resistance Cancellation
Series resistance cancellation automatically eliminates the temperature error caused by the resistance of the
routing to the remote transistor or by the resistors of the optional external low-pass filter. A total of up to 1 kΩ of
series resistance can be cancelled by the TMP451-Q1 device, eliminating the need for additional characterization
and temperature offset correction. See Figure 5, Remote Temperature Error vs Series Resistance, for details on
the effects of series resistance on sensed remote temperature error.
7.3.3 Differential Input Capacitance
The TMP451-Q1 device tolerates differential input capacitance of up to 1000 pF with minimal change in
temperature error. The effect of capacitance on sensed remote temperature error is shown in Figure 6, Remote
Temperature Error vs Differential Capacitance.
7.3.4 Filtering
Remote junction temperature sensors are usually implemented in a noisy environment. Noise is most often
created by fast digital signals, and it can corrupt measurements. The TMP451-Q1 device has a built-in, 65-kHz
filter on the inputs of D+ and D– to minimize the effects of noise. However, a bypass capacitor placed
differentially across the inputs of the remote temperature sensor is recommended to make the application more
robust against unwanted coupled signals. For this capacitor, select a value of between 100 pF and 1 nF. Some
applications attain better overall accuracy with additional series resistance; however, this increased accuracy is
application-specific. When series resistance is added, the total value should not be greater than 1 k
Ω. If filtering
is required, suggested component values are 100 pF and 50
Ω on each input; exact values are application-
specific.


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