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Questions tagged [temperature]

Temperature is a property of a substance related to the amount of heat energy it contains.

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Problems with Switch Marvell 88E6060 with high temperature

I having issues with the marvel switch 88E6060. https://www.marvell.com/switching/assets/marvell_linkstreet_88E6060_datasheet.pdf When the system reach the temperature of 80ºC the PC doesnt detect one ...
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1answer
88 views

Why do commercial components have a temperature range of -40 to 85c?

Why not -50 to 90? How was the temperature range of -40 to 85c chosen to become the industrial standard? (Some products may have a different operating temperature range, but for the majority, the ...
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2answers
42 views

Am I misunderstanding steady state power disspation calculations?

I am looking at the Littlefuse 5KP series. It says on the datasheet: I am trying to understand how they arrive at \$P_D\$ = 8.0W. Given thermal resistances of 40°C/W or 8.0°C/W, and 100°C ...
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1answer
39 views

Calculating SMD resistor temperature rise

I am interested in knowing the actual power dissipation of an SMD resistor at a 70C ambient temperature. I am looking at a 10kOhm 2512 1Watt resitor RMCF2512JT10K0. from the electrical specifications ...
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4answers
61 views

about formula in temperature of resistor

I have 10 watt resistor. I am using resistor with ac current. I need mathematical formula for learning temperature of resistor in t time. temperature of resistor depends P=V^2/R and time. Such as ...
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0answers
24 views

Estimate temperature for silicon (p-n junction)

I need to estimate the temperature at which p-n junction made of silicon lose it rectifying characteristics. (\$N_A=N_D=10^{15}\,cm^{-3}\$) \$E_G\$ is independent of the temperature and are 1.12 eV ...
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1answer
246 views

Temperature coefficient MOSFET vs. temperature coefficient of BJT

If you use transistors for an amplifier scheme, you want to make sure that when you parallel devices, you don't start to conduct more current if your transistors heat up. I know that when using ...
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1answer
31 views

MAX31855 and Type K sensor seem to top down at -60°C (should be measuring -80°C)

As a prelude, I'd like to offer that I have obviously read the famous question here: Sensor for ultralow (to -85°C) freezer monitor I have set up a K-Type probe from Adafruit and their MAX ...
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1answer
68 views

How can I simulate an NTC on LTspice?

I have a schematic for a temperature controlled device which should operate at a particular temperature. For that I am using an NTC, now I have done the math by hand but it is more efficient and ...
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2answers
28 views

LSM303C temperature sensor

I'm trying to read the temperature sensor from the LSM303C. I have enabled the sensor and can see the values move when the temperature is changed. But, the format of the sensor data is not provided by ...
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2answers
105 views

I want to attach a heat sink to the inductors on my motherboard, which glue could I use? [closed]

If I wanted to attach a heat sink to the inductors on my motherboard, which glue could I use? I have a Gigabyte A320M-S2H, this motherboard has heating problem when used with the AMD ZRyzen 7 2700X ...
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75 views

How to calculate the Temperature rise of PCB and its surrounding air from the power PCB consumes?

I am having a difficulty understanding some mechanism regarding heat generation from an electronic PCB (Printed Circuit Board) and its effect on atmospheric temperature. I don't know if this question ...
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1answer
95 views

DHT22 bad readings on long rj45 cable

Duplicate of https://raspberrypi.stackexchange.com/questions/91781/dht22-bad-readings-on-long-cable, I figured there is chances people here have a solution for me. Hi, I'm preparing a setup with a ...
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1answer
52 views

power consumption of sensors

How to measure the power consumed by a temperature sensor theoretically? The datasheets mention the supply voltage range and output current. So, to calculate the power supply current will be used in ...
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0answers
22 views

How to verify a complete BOM complies a temp range?

I' verifying a board, which has about 300 components, and I would like to verify if all components comply with the -25° to 70° temp range. its a very time consuming task. I tried importing the BOM ...
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1answer
87 views

How to read temperature with STM32F103C8T6? [closed]

How can I read the temperature using an NTC thermistor with an STM32F103C8T6 board??
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1answer
29 views

Conductivity formula for Metals

Is there any expression for the direct change in conductivity of metals with temperature ? I am aware of change in resistivity with temperature.
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94 views

Confusion with relating thermal resistance temperature, and electrical power and heat sinking

What is meant by the following?: In general, a device with a thermal resistance θ equal to 100°C/W will exhibit a temperature differential of 100°C for a power dissipation of 1 W, as measured ...
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3answers
77 views

How should I used two MLX90614 sensor on one Arudino Uno given that the sensor has a fixed I2C bus adress? [duplicate]

I have an arduino uno and want to use a non MLX90614. I plan to used more than one sensor on the same Arduino but I don't know how to use two MLX90614 on the same I2C bus.
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4answers
103 views

Are circuits damaged by a constant 55°C environment?

I know that sun like temperatures kill electronics, but what about 55°C if it's constant? I have a small commercial web camera that is officially rated 0°C to 70°C. It has no jelly capacitors. I ...
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1answer
47 views

Adafruit Pt100 temperature sensor

I want to connect 3 wire pt100 sensor with arduino uno, without using any amplifier or op-amp. What could be the circuit of the same?
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2answers
91 views

STM32L4's Temperature Calculation Equation shows improper results

While using STM32L4's ADC to measure its internal temperature sensor data, I am facing an issue. The equation provided in STM32L4's reference manual, seems to showing improper results. The equation ...
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2answers
47 views

Selecting temperature probe for home use with long cable / low power [closed]

I would like to monitor the temperature outside my home. The sensor has to be located at least 20m cable length from the display unit. Whole system should be powered by a battery (doesn't matter which)...
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1answer
32 views

Thermal drift in diodes

Hi guys and thanks for reading and your help. I can't understand a thing that my book says: "When the temperature grows, the diode will let flow more current" and then it gives 2 formulas: \$V_t = \...
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1answer
25 views

Array Resistor Temperature Coefficient

This resistor array is provided with a +/-200ppm/°C temperature drift. I understand that is the maximal allowed drift. However, does it means, within in single package array, is it likely that all ...
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1answer
39 views

Why is temperature coefficient divided by reference resistance?

In a book I am following, it is assumed that the temperature resistance relationship is linear. I would expect, then, that the resistance at a given temperature would be given by the formula $$ R_{t}...
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4answers
273 views

STM32 MCU - Temp sensor gives weird values

I'm fooling around with a Nucleo-F103RB STM32 board and I'm trying to measure the ambient temperature using its internal sensor. I activate the ADC and get data normally via the ...
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0answers
42 views

PID neural network temperature inertia

I am using a PID Neural Network (PIDNN) algorithm to control a multi-zoned temperature hardware. The aim of the algorithm is to minimize the error with the Backpropagation rule and weights updating. ...
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0answers
28 views

DHT-22 input voltage problem

So I built a basic weather station with an Arduino nano and a DHT22. The problem I encountered is that when powering the whole unit with the laptop USB it gave me precise results, but when using a 5V ...
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0answers
15 views

Eddy Current Transducer Temperature Compensation

I was checking out the Eddy Current Transducer, so far I understood the working principle by the explanations. However, I did not understand how the passive(compensation,balance) coil provides ...
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2answers
80 views

Temperature Controlled System using LM 35

The fan should start to rotate when the temperature is above the threshold temperature and stop when the surrounding becomes cool. But the fan starts rotating as soon as the power supply is connected ...
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1answer
37 views

How to evaluate the assembly Storage temperature?

Question about the Storage Temperature after soldering in general. If the components were all specified with, for example: Storage Temperature Tstg : -65...+125°C; Operating Temperature (or ...
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1answer
108 views

Sallen-Key filter for PT100 RTD measurement

I am going to build temperature sensing system using PT100 sensor (and later Raspberry PI 3). I refer my work to Microchip note AN687 Precision Temperature-Sensing With RTD Circuits. On the page 4 is ...
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1answer
35 views

Interface PID temperature control module using Arduino

I need to interface a modular type temperature controller using Arduino. This is the datasheet of temperature controller The datasheet mentioned like this, My questions are, How can I interface( ...
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2answers
83 views

Temperature sensors for low temperature

I want to find a temperature sensor able to be used from -80 °C to 20 °C, measuring air temperature, with a potentially low pressure, reaching 1 kPa. Another constraint is that it should be as small ...
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2answers
138 views

Which is the most accurate temperature sensor in the market? [closed]

I have been working on a project requiring very accurate and precise measurements of temperature, of the order of +-0.1 degrees Celcius (or the closest to this), I have been using a LM-35 and as ...
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2answers
176 views

Gate and routing delays as a function of voltage and temperature

As I understand from watching overclocking videos, the maximum operating frequency of a digital ASIC is a function of voltage and temperature. Specifically, it seems that the maximum operating ...
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0answers
141 views

Soldering sheet busbars to PCB concerns

Hello fellow engineers I have decided to solder busbars to a high current pcb , but i have 2 concerns : Does soldering a flat busbar (shown in left image) could cause thermal stress and deformation ...
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2answers
90 views

How to condition a NTC of very low resistance?

I want to use a temperature sensor which changes its resistance. For 0 degrees celsius its resistance is 0.5325 ohms and for 40 degrees celsius it is 3.264 ohms. Obviously putting it in series with ...
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1answer
230 views

DS18S20 Temp sensor HAL Library

I am using stm32f303k8t6 nucleo board and Keil V5 IDE. I want to measure temperature with DS18S20 sensor over one wire interface. I have downloaded the HAL library from https://github.com/nimaltd/...
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10answers
2k views

Heating a tube of aluminium electrically

I need to regulate the temperature of the surface of a tube of aluminium. The tube is used as a mandrel for composite molding/curing, so the target temperature is below 100C. Currently, there is no ...
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1answer
44 views

KTY82/220 Temperature sensor terminals

I wanted to use NXP KTY82/220(https://www.nxp.com/docs/en/data-sheet/KTY82_SER.pdf) temperature sensor for my circuit. But I could not see which are the terminals for Vdd, GND and Analog Out in ...
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2answers
96 views

Micro Watt Meter in Extreme Low Temperature [closed]

I'm using a solar panel in the Arctic and I want to measure the power it delivers to the associated sensors. Is there any recommendation on a watt meter for this environment? The temperature is ...
2
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2answers
82 views

Measuring junction temperature of LED tape?

My boss at work wants me to figure out a method of measuring the junction temperature of an LED that is part of a reel of tape. Unfortunately, there is no datasheet for the LED modules themselves, ...
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1answer
94 views

Temperature sensing bee hive

I am a honey bee researcher and I want to build a temperature sensing system to monitor the temperature changes in the three dimensional space within the hive body using 5 sensors on each hive frame (...
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1answer
27 views

How to find the actual measurement range of a temperature sensor, HTS221?

I am considering to buy the HTS221 Digital Temperature and Humidity Sensor by STMicroelectronics. The datasheet says the operating temperature of the sensor is from -40°C to 120°C. But on page 33 of ...
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2answers
590 views

Magnetometer thermal drift

I try to measure Earth's magnet field with LIS3MDL. This chip is operable in (-40..+85) deg. When the temperature is lower than -10 deg, the chip measures becomes wrong. The plot of raw measures after ...
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1answer
89 views

Connecting an analog temperature sensor IC to an ADC input of a microcontroller

I am trying to connect an analog temperature sensor LMT84 (http://www.ti.com/product/lmt84) to a micro controller (3.3VDC) using its ADC pin which is 1.4V tolerant (max). My Vcc is 3.3V, ADC max ...
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3answers
81 views

Measuring temperature of fluids inside a glass tube

Suppose I have some experiment with some fluid (e.g. water or milk) flowing through (or just residing in) a cylindrical tube made of glass. What would be a good way to "non invasively" measure the ...
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2answers
34 views

Question about pressurization and introducing air into a small chamber

This is probably very easy to answer, but I'm working on a project where I need to heat a chamber (insulated Styrofoam container), and my option to heat it is essentially a hair dryer, as a heat gun ...