Adjustable potentiometer / rotation angle sensor
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Overview
LM35 is a temperature sensor manufactured by National Semiconductor. Its output voltage exhibits a linear relationship with the Celsius temperature scale. The conversion formula is defined as follows: at 0°C, the output voltage is 0V, and it increases by 10mV for every 1°C rise in temperature.
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Technical Specifications
| Operating Temperature Range| 0°C – 100°C
| Operating Voltage | 4V – 30V |
| Accuracy | ±1°C |
| Maximum Linear Error | ±0.5°C |
| Quiescent Current | 80μA |
| Sensitivity | 10mV/°C |
| Quiescent Current (Single Supply, 25°C) | ~50μA |
| Efficient Supply Voltage Range | 4V – 20V |
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Power Supply Modes
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Single Power Supply: Applicable for positive temperature measurement scenarios.
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Positive-Negative Dual Power Supply: Enables measurement of negative temperatures by expanding the operating range.
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Thermal Performance: Features low self-heating effect, with a static temperature impact of 0.08°C, ensuring minimal interference with temperature measurement accuracy.
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Calibration
At room temperature, the LM35 can achieve an accuracy of ±1/4°C without requiring any additional calibration process, simplifying system integration and reducing operational complexity.
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Packaging
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Package Type: Utilizes a package similar to a plastic-encapsulated transistor (TO-92), facilitating easy mounting and handling in circuit designs.
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Variants: Available in multiple package styles to accommodate diverse application requirements (specific configurations are illustrated in the accompanying diagram).
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Features
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No External Components Required: Operates independently without the need for any peripheral components, reducing system cost and circuit complexity.
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No Calibration Needed: Eliminates the requirement for debugging or calibration (standardization) during use, streamlining the setup process.
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Direct Thermometer Function: Can directly function as a thermometer by connecting a 1V meter (e.g., pointer or digital multimeter), enabling straightforward temperature readout without additional signal processing.
