Questions tagged [temperature]

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

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Analog Microelectronics ASM 5915 pressure/temperature sensor coding problem

I'm trying to use an Analog Microelectronics ASM5915-1000-D pressure/temperature sensor with a Raspberry Pi Pico running CircuitPython. I'm communicating with the device using I2C, and getting data ...
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Thermocouple vs NTC

I want to test the accuracy of the NTC soldered in a current sensing board with a shunt resistor. For that, I attached a thermocouple type K to the junction of the shunt using epoxy and applied a ...
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Max operating temperature for PCB/Chip antennas

I'm looking for an antenna (PCB or chip), which I'd like to install in an environment that can exceed 110°C. Here are my questions : Should I trust the temperature ranges given for antennas? The ...
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How "Zero" is this supposedly Zero-TCR resistor? And how much better is it than this other one?

I found a resistor at Digikey, and the TCR was quoted as being 0.0ppm/°C, and I had to check the datasheet just to refute my suspicion that it was a data entry error, and it looks real, but just how ...
MicroservicesOnDDD's user avatar
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Cold junction temperature measurement in Multichannel Thermocuple

In a multi-channel thermocuple signal conditioner (for example, 5 channels on a single PCB), should I add 5 separate junction temperature measurements to the thermocuple input of each channel to ...
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NXP and TMP75 I2C communication

I'm trying to read temperature from TMP75 sensor using NXP family microcontroller. I'm able receive proper temperature data, but with Send() command I'm getting errors in my handling procedure. I've ...
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LTspice: simulating temperature

I want to simulate the effect of temperature on a semiconductor. I can use .temp ... or .option temp ... or ...
hennep's user avatar
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Is it wise to determine heating element temperature from resistivity?

Context I'm making an electric furnace for melting metal, and aiming to make my own controller. Everyone seems to just use thermocouples and a control loop, I thought perhaps I could just measure the ...
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STM32F031 HSI clock temperature impact

I developed an electrical board that contains a STM32F31C4T6. The product worked well for more than two but since this summer I have customer feedback on malfunctions of the card, it no longer works ...
Kolia's user avatar
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Estimating GaN HEMT junction temperature

I think it's quite a simple question, but the solution is not so obvious for me. I know the equation Tj=Ptot×Rth+Ta, the thermal resistance Rthj-a and RDSon temperature dependance come from the ...
Den's user avatar
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Can a chip be damaged if it goes above operating temperature while running?

An image sensor I'm using has the following temperature spec: Absolute Maximums: Ambient storage Temperature Max: 125°C Recommended Operating Conditions: Stable image temperature Max: 50ºC ...
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How to derive thermal time constant from a MOSFET's datasheet?

I use the Vishay SiA440DJ MOSFET in a PMSM inverter. For thermal simulation in Maltab/Simscape I need to provide thermal data. On pg. 1 of the datasheet the thermal resistance Junction to ambient = 80 ...
hanss's user avatar
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How does temperature affect ripple current parameter in electrolytic capacitors?

A maximum ripple current declared, for example, at 100 kHz and at a temperature of +105 ℃ for an electrolytic capacitor, if estimated at a temperature of +85 °C, how much does it increase? What order ...
Coriolanus's user avatar
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Temperature control with Peltier device and temperature controller

I am working on realizing a temperature controller using an Peltier device, H-bridge and temperature controller. My temperature controller has a PWM duty cycle that (at 20 kHz) goes from -1000 (...
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How does current flow in this temperature protection circuit?

Reading through the data sheet for a TP4056 Li-ion battery charger, I found the diagram of a typical application. I'm trying to fathom how the temperature protection circuit functions. I've found this ...
nohatsatthetable's user avatar
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Configuring LM35 to read below 0 degrees C

I read online that the LM35 has a temperature range of -55°C to 150°C, but when testing I found that it was unable to go below 0°C. This is the code I've written to read from the temperature sensor. I ...
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How to estimate the temperature rise in an enclosed space due to power dissipation? [duplicate]

I am planning a battery maintenance system that discharges a battery to a storage-compatible state of charge if the battery is not used for some time. I would ideally like to dissipate 4kWh over 15 ...
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Is it possible to display DHT11 on a 4 digit-7-segment with a PIC16f877A?

I'm trying to display the temperature of the DHT11 on a 4-digit-7-segment. I simulated it on Proteus and the result always equal to 0. I wonder if the way I used timer to display the LED affected the ...
stevievei's user avatar
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Different result displaying LM35's temperature on a 4-digit 7-segment using PIC16F877A versus Arduino

I'm working on a project using a display LM35 using PIC16F877A but the room temp was measured around 70°C. I tried using this LM35 with Arduino and it showed result around 40°C. I used a multimeter to ...
stevievei's user avatar
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NTC layout for MOSFET temperature sensing

Here is a picture where there is a NTC (RT501) that is surrounded by a solder ring connected to the copper pour of the drain of the MOSFETs. Any reason why the layout the way it is with the ring? Also ...
EarthLord's user avatar
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Step up circuit burns protection diode

I have implemented a step up circuit using an IC. I implemented the component selection from the datasheet. This is its datasheet. Image source: LCSC - AZ34063U datasheet The step up feeds an H-...
user1584421's user avatar
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Why is the DHT22/AM2302 sensor output value divided by 10?

The divisor of 10 in the signal processing formula, where does it come from? source: https://labprojectsbd.com/2020/05/17/how-to-interface-dht22-am2302-rht03-sensor-with-pic16f877a/
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LTspice temperature

Is this rightly done when doing in LTspice? Find out the effect of temperature in the range of -20°C to +100°C on the magnitude of the value of one of the resistances if its: a) the linear coefficient ...
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Testing component temperature with IPA and thermal shock

Not infrequently a question will be asked on this site about components that are hot to the touch. I generally consider hot to the touch to be about \$140^{\circ}\$ F or \$60^{\circ}\$ C. While I, ...
Math Keeps Me Busy's user avatar
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low frequency ripple current RMS amps and temperature rise in MLCC

Manufacturers only specify this metric of 0.1, 0.5 and 1MHz. Is there any way to calculate / estimate the temperature rise in these capacitors for much lower frequencies, in the Hz range, based on ...
kellogs's user avatar
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2 votes
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Soft latching power circuit stops working after heating

I implemented the below latching power circuit (can be found here https://circuitcellar.com/resources/quickbits/soft-latching-power-circuits/) that has 1 button to turn the circuit on and is turned ...
ruben's user avatar
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TC1046VNBTR: Temperature Sensor output has an oscillation

I am utilizing the Microchip TC1046VNBTR on my PCB to measure ambient temperature of the board. I am trying to get a reasonably accurate reading (2-3 °C accuracy). I am using a basic setup based on my ...
Kyle Muehlegg's user avatar
10 votes
5 answers
2k views

Thermal relief for a chip without metal plate on the bottom

I have a chip in which I have selected this footprint: Package_SO: SOIC-8_3.9X4.9mm_P1.27mm. This is what it looks like: Because this chip gets pretty hot, I ...
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Is it better using NTC or a proper temperature sensor?

I need to sense temperature for a lithium battery pack and a TO-220 package transistor. Would an NTC with voltage divider be ok or is it better to use a sensor like the LM36? Note: Measured ...
Hazardous Voltage's user avatar
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3 answers
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Capacitor and LDO voltage regulator gets really hot on circuit board

THE PROBLEM: I used this LDO voltage regulator (SOT223 package) with a 4.5 V input from 3 AAA batteries to provide a steady 3.3 V as output for all the other components. The voltage regulator, C7 and ...
Ammar Yasir's user avatar
2 votes
3 answers
496 views

Sending a float type values over CANBUS

I need help in sending float-type values over CANBUS. I'm working on data acquisition of an fsae car. I'm using Teensy 4.1 and Teensy 3.5 using MCP2562 and MCP2551 CAN transceivers (respectively) to ...
megahgan's user avatar
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1 answer
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PCB design around HTU21D and HTU31D temperature sensors

I'm currently designing a IoT device based on an ESP32. This one comes on a mainboard where HAT could be plugged in (nothing new here). The current HAT I'm working on is a temperature and humidity ...
Thibaut Delguste's user avatar
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Heating device needs alarm

I am making a heating device prototype using an M12 battery and a 12 V diesel glow plug. As you might imagine, heat is a problem. In this case however, because of my set-up, the heat problem I have ...
Rick DuRapau's user avatar
1 vote
3 answers
79 views

10 µA sensor excitation

I need to measure cryogenic temperatures using a silicon diode type temperature sensor. This has a 4 wire interface. Two wires for a 10 µA current excitation for the sensor and 2 wires for the voltage ...
John's user avatar
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Setting the parameters of PID for 10 °C set point

I have a PID controller (REX C100), connected to a TEC1-12706 (Thermal Electric Cooling) and a thermocouple K-type. I want to set 10 °C on my PID. The problem is that the actual temperature in PID is ...
Hamed's user avatar
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Best method to sense low temperatures while using low current

I need to measure temperatures of -80C, and the circuit needs to be battery-powered. So I thought an RTD probe with the MAX31865 RTD-to-Digital Converter would work well. I am using an nRF52840 for a ...
MattG's user avatar
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Lithium Polymer Battery Touching a Stepper Motor

I posted this question in the Arduino forums, but I thought I would post it here too for a broader audience of advice. Hey there everybody :) I’m Cal and am super new to Arduino. I’ve been into ...
Cal Courtney's user avatar
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Output voltage thermocouple amplifier decrease when temperature increase

To detect surface temperature of heating foil, I decided to use thermocouple of type K. To amplify the small signal I choose the thermocouple amplifier with cold junction compensation integrated, ...
stefyanna's user avatar
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4 answers
633 views

Wheatstone Bridge with Instrumentation Amplifier

I have set up this circuit: I measure an output of 0.61 V from the instrumentation amplifier. The gain of the amplifier is set to 21. The formula for the output is given by: Uout=(1+2R1/Rg)×(R3/R2)×(...
Eirik's user avatar
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5 votes
1 answer
951 views

High-temperature microcontroller

I am looking for a microcontroller to replace a Teensy 4.0. The problem is that the Teensy doesn't cope well with high temperatures. I realise that seeking recommendations for specific products is ...
Juno's user avatar
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2 votes
1 answer
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Temperature rise for multiple layers of PCB

I'd like to better understand what to expect when carrying current on multiple layers of a PCB. I've used trace width calculators to determine how wide a trace needs to be to carry a given amount of ...
mattmunee's user avatar
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Going beyond temperature rating for surface mounted resistor? Will it damage it?

I am putting surface mounted resistors inside a vacuum chamber and then baking the vacuum chamber at 200°C for 2 weeks, no voltage will be applied to the resistors during this time. Will this damage ...
fgsiv's user avatar
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3 votes
1 answer
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Temperature sensor on a long wire (100ft) [closed]

I'd like to monitor the temperature of a variety of locations around my house but I don't want to rely on wireless technology. Are there temperature sensors that can be connected over long distances (...
Ben Vitale's user avatar
1 vote
1 answer
74 views

How do you properly monitor temperature in a PCB for safety?

I am building a PCB board and it is almost done. I want to add some safety features like temperature sensing for when the board gets too hot it will turn off the system. If I use only 1 temperature ...
Trev347's user avatar
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1 vote
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Standard Thick Film Chip Resistor datasheets not mentioning storage temperature

I am looking for alternatives for a 120ohm 5% 1206 standard thick film chip resistor. I have noticed some MFRs (KOA speer, Vishay, Bourns) do not always detail the storage temperature in their ...
313Ctron's user avatar
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How can I compare thermal behaviour between two packages with an equivalent resistors circuit?

I want to make a thermal analysis of QFP and BGA packages for a microcontroller. I know that in terms of thermal dissipation BGA is a worse election, but I want to know how much worse it is. I don't ...
Developing Electronics's user avatar
1 vote
1 answer
169 views

Temperature control of a system with variable setpoint and variable outside temperature

I'm building an insulated box in which I have about 5-6 liters of water which will be cooled/warmed by a Peltiers, driven by variable current. The setpoint will vary between 16 and 26 degrees C, and ...
irilinir's user avatar
2 votes
3 answers
101 views

Does wrapping kiln resistance wire back on itself reduce the temperature of that stretch of wire?

When replacing the resistance wire in an electric kiln, most manufacturers recommend wrapping the resistance wire back on itself at the ends where it connects to the electrics. Although I haven't ...
RightmireM's user avatar
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Battery charger failure

I'm using this Battery Charger IC - MCP73831. I am using a SOT-23 package. My input is 5V, the output Vbat charge regulated voltage on the Vbat pin is 4.2V and the maximum charge current is 340mA. So, ...
Freshman's user avatar
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1 answer
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Question with Thermal Shutdown and Junction Temperature

I'm using this Battery Charger IC - MCP73831. So, I am using a SOT-23 package. My input is 5V, the output Vbat charge regulated voltage on the Vbat pin is 4.2V and the maximum charge current is 340mA. ...
Freshman's user avatar

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