LM35DT

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Temperature sensors measure the temperature of the object or environment they are monitoring, and output the value as a digital or analog signal. Of these sensors, the LM35DT is especially notable for its applications in high-temperature sensing, and its relative simplicity of use. This article explores the LM35DT’s application field and working principle.

The LM35DT is a temperature-sensing device that is capable of operating in temperatures between -55℃ and 150℃. It produces an analog voltage output that is directly proportional to the input temperature. This makes the LM35DT an ideal temperature-sensing device for high temperature applications.

The LM35DT is a two-wire device, making it easy to install and use. It operates on a range of supply voltages (3V, 5V, 9V, 12V, 15V, 32V, and 40V). The presence of an onboard comparator ensures a fast response time. Additionally, the device features low power consumption and low offset drift.

The common applications of the LM35DT include:

• Medical equipment, such as thermometers, where precision temperature sensing is required.
• High-temperature industrial controls, such as burners and heaters, where the LM35DT’s high temperature capabilities are especially useful.
• Automotive applications, such as fuel and air intake monitoring.
• Remote sensing, where the device’s long range of operation is advantageous.

The working principle of the LM35DT is simple. The device consists of three elements: a sensing element, a reference element, and a comparator. The sensing element is the LM35DT itself. It is connected to the sensor which is measuring the temperature. The reference element is connected to a voltage source. When the temperature of the reference element differs from the temperature of the sensor, the output voltage varies linearly with the difference.

The comparator element then compares the output voltage to the reference voltage, and adjusts the output voltage as necessary. This allows the LM35DT to maintain an accurate voltage output that corresponds with the temperature difference between the two elements.

The LM35DT is a versatile and reliable temperature-sensing device. Its combination of low power consumption, precision operation, and wide temperature range makes it ideal for use in medical devices, high-temperature industrial systems, automotive applications, and remote sensing. The device’s simple working principle makes it easy to install and use.

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