Overview
The LMT85LPM, produced by Texas Instruments, is a precision CMOS temperature sensor designed for high accuracy and low power consumption. It operates with a supply voltage as low as 1.8V and features a quiescent current of 5.4 µA, making it ideal for battery-powered applications. The sensor provides a linear analog output voltage that is inversely proportional to temperature, with an accuracy of ±0.4°C typical over a wide temperature range of –50°C to 150°C. The LMT85LPM is available in various packages, including the TO-92 package, which supports both on-board and off-board mounting options.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 1.8 | - | 5.5 | V |
| Quiescent Current | - | 5.4 | - | µA |
| Temperature Range | -50 | - | 150 | °C |
| Temperature Accuracy | -2.7 | ±0.4 | 2.7 | °C |
| Output Voltage Gain | - | -8.2 | - | mV/°C |
| Thermal Time Constant | - | 10 s (1.2 m/s airflow) | - | s |
| Output Drive Capability | - | ±50 µA | - | µA |
| Package Options | - | SOT (SC70), TO-92, TO-92S | - | - |
Key Features
- Very accurate: ±0.4°C typical accuracy
- Low 1.8-V operation with 5.4-µA quiescent current
- Wide temperature range: –50°C to 150°C
- Output is short-circuit protected
- Push-pull output with ±50-µA drive capability
- Footprint compatible with industry-standard LM20/19 and LM35 temperature sensors
- Cost-effective alternative to thermistors
- Fast thermal time constant for off-board applications
Applications
- Automotive: Infotainment and cluster, powertrain systems
- Smoke and heat detectors
- Drones
- Appliances
- Battery-powered devices and sensor nodes
Q & A
- What is the operating voltage range of the LMT85LPM?
The LMT85LPM operates with a supply voltage range of 1.8V to 5.5V. - What is the typical quiescent current of the LMT85LPM?
The typical quiescent current is 5.4 µA. - What is the temperature accuracy of the LMT85LPM?
The temperature accuracy is ±0.4°C typical over the operating range. - What are the package options available for the LMT85LPM?
The LMT85LPM is available in SOT (SC70), TO-92, and TO-92S packages. - Is the output of the LMT85LPM short-circuit protected?
Yes, the output is short-circuit protected. - What is the output drive capability of the LMT85LPM?
The output can drive ±50 µA. - What are some typical applications of the LMT85LPM?
Typical applications include automotive systems, smoke and heat detectors, drones, appliances, and battery-powered devices. - How does the LMT85LPM handle capacitive loads?
The LMT85LPM can drive capacitive loads up to 1100 pF without additional components. For loads greater than 1100 pF, a series resistor may be required. - Can the LMT85LPM be used in noisy environments?
Yes, the LMT85LPM can operate in noisy environments with the addition of bypass capacitance on the supply. - How can the LMT85LPM be powered down to conserve power?
The LMT85LPM can be powered directly from a logic gate output or a microcontroller GPIO, allowing it to be easily turned off for power savings.
