Overview
The LMT85DCKR from 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 such as drones and sensor nodes. The sensor provides a linear analog output voltage that is inversely proportional to temperature, with a typical accuracy of ±0.4°C over a wide temperature range of –50°C to 150°C. The LMT85DCKR is available in various packages, including the SC70 (SOT-5) package, which is surface-mountable.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 1.8 | 5.5 | V | |
| Quiescent Current | 5.4 | 5.4 | 9 | µA |
| Temperature Range | –50 | 150 | °C | |
| Average Sensor Gain | –8.2 | mV/°C | ||
| Accuracy | ±0.4 | ±2.7 | °C | |
| Power-on Time | 0.7 | 0.7 | 1.9 | ms |
| Output Drive Capability | –50 | +50 | µA | |
| Output Load Capacitance | 1100 | pF |
Key Features
- Very Accurate: ±0.4°C typical accuracy.
- Low 1.8-V Operation with a quiescent current of 5.4 µA.
- Average Sensor Gain of –8.2 mV/°C.
- 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 (for LMT85LPG package): 10-s Typical (1.2 m/s Airflow).
Applications
- Automotive: Infotainment and Cluster, Powertrain Systems.
- Smoke and Heat Detectors.
- Drones.
- Appliances.
- Battery-Powered Devices: Sensor nodes, etc.
- Off-board time-temperature sensitive applications.
Q & A
- What is the operating temperature range of the LMT85DCKR? The LMT85DCKR operates over a temperature range of –50°C to 150°C.
- What is the typical accuracy of the LMT85DCKR? The typical accuracy is ±0.4°C.
- What is the quiescent current of the LMT85DCKR? The quiescent current is 5.4 µA.
- What is the average sensor gain of the LMT85DCKR? The average sensor gain is –8.2 mV/°C.
- Is the output of the LMT85DCKR short-circuit protected? Yes, the output is short-circuit protected.
- What is the drive capability of the LMT85DCKR's output? The output has a ±50-µA drive capability.
- Is the LMT85DCKR footprint compatible with other industry-standard temperature sensors? Yes, it is compatible with the LM20/19 and LM35 temperature sensors.
- What is the power-on time of the LMT85DCKR? The power-on time is 0.7 ms.
- Can the LMT85DCKR handle capacitive loads? Yes, it can handle capacitive loads up to 1100 pF without additional components.
- What are some typical applications of the LMT85DCKR? Typical applications include automotive systems, smoke and heat detectors, drones, appliances, and battery-powered devices.
