LM35 Precision Centigrade Temperature Sensor
LM35 overview
LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. It is a small and cheap IC that can be used to measure temperature anywhere between -55°C to 150°C. They are used for a wide array of applications and can easily be interfaced with any Microcontroller that has ADC function or any development platform like Arduino.
The LM35 series is available packaged in hermetically sealed TO-46 transistor packages, while the LM35C, LM35CA, and LM35D are also available in the plastic TO-92 transistor package. LM35 does not require any external trimming, although the main drawback of this sensor is that it outputs data in analog format, making it very prone to external noise and interference. The device is used with single power supplies, or with plus and minus supplies. As the LM35 sensors draw only about a bare minimum of 60 µA from the supply, it has very low self-heating of less than 0.1°C in still air.
Key specifications
Datasheet
LM35 features
- Calibrated directly at ° Celsius (Centigrade)
- Linear + 10.0 mV/°C scale factor
- 0.5°C accuracy guaranteeable (at +25°C)
- Rated for full −55° to +150°C range
- Suitable for remote applications
- Low cost due to wafer-level trimming
- Operates from 4 to 30 volts
- Less than 60 μA current drain
- Low self-heating, 0.08°C in still air
- Nonlinearity only ±1⁄4°C typical
- Low impedance output, 0.1 W for 1 mA load
LM35 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | Vcc | Input voltage is +5V for typical applications |
| 2 | Analog Out | Analog output pin. There will be an increase of 10mV for raise of every 1°C. Can range from -1V(-55°C) to 6V(150°C) |
| 3 | Ground | Connected to the ground of the circuit |
LM35 specifications
| Local sensor accuracy (Max) (+/- C) | 1 |
|---|---|
| Operating temperature range (C) | -40 to 110, -55 to 150, 0 to 100, 0 to 70 |
| Supply voltage (Min) (V) | 4 |
| Supply voltage (Max) (V) | 30 |
| Supply current (Max) (uA) | 114 |
| Interface type | Analog output |
| Sensor gain (mV/Deg C) | 10 |
| Rating | Catalog |
| Vapor Phase (60 seconds) | 215°C |
| Infrared (15 seconds) | 220°C |
| Features | UL recognized |
LM35 applications
- Measuring the temperature of a particular environment
- Providing thermal shutdown for a circuit/component
- Monitoring Battery Temperature
- Measuring Temperatures for HVAC applications.
More about LM35
LM35 Specifications
- ESD Protection
- Overvoltage Protection
Datasheet LM35
See Also: CD4059 Program Divide-by-N Counter | Espressif ESP8266 Serial ESP-01 WiFi Module | 74LS125 Quad Bus Buffer Negative Enable Tri-State
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