Overview
The LMT85LPG is a precision CMOS temperature sensor produced by Texas Instruments. It offers high accuracy and low power consumption, making it suitable for a wide range of applications. The sensor operates with a supply voltage as low as 1.8V and consumes a quiescent current of 5.4µA, which is ideal for battery-powered devices such as drones and sensor nodes. The LMT85LPG features a linear analog output voltage that is inversely proportional to temperature, with a typical accuracy of ±0.4°C and a maximum accuracy of ±2.7°C over a temperature range of –50°C to 150°C.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 1.8 | 5.5 | V | |
| Quiescent Current (IS) | 5.4 | 5.4 | 9 | µA |
| Average Sensor Gain | -8.2 | -8.2 | mV/°C | |
| Temperature Range | -50 | 150 | °C | |
| Power-on Time | 0.7 | 0.7 | 1.9 | ms |
| Output Drive Capability | ±50 | ±50 | µA | |
| Output Load Capacitance (CL) | 1100 | pF |
Key Features
- Very Accurate: ±0.4°C typical accuracy (±2.7°C maximum)
- Low 1.8-V Operation
- Low 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 the Industry-Standard LM20/19 and LM35 Temperature Sensors
- Cost-Effective Alternative to Thermistors
- Fast Thermal Time Constant (10-s Typical with 1.2 m/s Airflow) for the TO-92S package
Applications
- Automotive: Infotainment and Cluster, Powertrain Systems
- Smoke and Heat Detectors
- Drones
- Appliances
- Battery-Powered Devices and Sensor Nodes
Q & A
- What is the typical accuracy of the LMT85LPG temperature sensor?
The LMT85LPG has a typical accuracy of ±0.4°C.
- What is the operating supply voltage range of the LMT85LPG?
The LMT85LPG operates with a supply voltage range of 1.8V to 5.5V.
- What is the quiescent current of the LMT85LPG?
The quiescent current of the LMT85LPG is 5.4µA.
- What is the temperature range of the LMT85LPG?
The temperature range of the LMT85LPG is –50°C to 150°C.
- What is the output drive capability of the LMT85LPG?
The LMT85LPG has a push-pull output with ±50-µA drive capability.
- Is the LMT85LPG footprint compatible with other industry-standard temperature sensors?
- What are some typical applications of the LMT85LPG?
The LMT85LPG is used in automotive systems, smoke and heat detectors, drones, appliances, and battery-powered devices.
- How does the LMT85LPG handle capacitive loads?
The LMT85LPG can drive a capacitive load less than or equal to 1100 pF without additional components. For loads greater than 1100 pF, a series resistor may be required.
- What is the thermal time constant of the LMT85LPG in the TO-92S package?
The LMT85LPG in the TO-92S package has a fast thermal time constant of 10 seconds typical with 1.2 m/s airflow.
- How can the LMT85LPG be powered down to conserve power in battery-powered systems?
The LMT85LPG can be powered directly from a microcontroller GPIO or any logic gate output, allowing it to be easily turned off for power savings.
