Overview
The LMT88DCKR from Texas Instruments is a precision analog output CMOS integrated-circuit temperature sensor. It operates over a wide temperature range of −55°C to 130°C and is powered by a supply voltage ranging from 2.4 V to 5.5 V. This device is known for its low power consumption, with a quiescent current of less than 10 μA, which minimizes self-heating to less than 0.02°C in still air. The LMT88 is a cost-effective alternative to thermistors and is suitable for various applications requiring accurate temperature sensing.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Temperature Range | −55°C | 130°C | °C | ||
| Supply Voltage Range | 2.4 V | 5.5 V | V | ||
| Quiescent Current | 2.4 V ≤ V+ ≤ 5.5 V, TA = 25°C | 4.5 μA | 7 μA | 10 μA | μA |
| Temperature to Voltage Error | TA = 25°C to 30°C | −4.0°C | ±1.5°C | 4.0°C | °C |
| Shutdown Current | V+ ≤ 0.8 V | 0.02 μA | μA | ||
| Output Impedance | 160 Ω | Ω |
Key Features
- Precision Analog Output: The LMT88 provides an analog output that is inversely proportional to temperature, with a transfer function that is predominantly linear but has a slight predictable parabolic curvature.
- Wide Operating Range: Operates over a temperature range of −55°C to 130°C and a supply voltage range of 2.4 V to 5.5 V.
- Low Power Consumption: Quiescent current of less than 10 μA, minimizing self-heating to less than 0.02°C in still air.
- Cost-Effective: A cost-competitive alternative to thermistors.
- Compact Package: Available in an SC70 package with a body size of 2.00 mm × 1.25 mm.
- High Accuracy: Typically ±1.5°C at an ambient temperature of 30°C, with the temperature error increasing linearly to a maximum of ±5°C at the temperature range extremes.
- Capacitive Load Handling: Can drive capacitive loads up to 300 pF without decoupling and can be filtered for noisy environments.
Applications
- Industrial: Suitable for industrial environments requiring precise temperature monitoring.
- HVAC: Used in heating, ventilation, and air conditioning systems for temperature control.
- Disk Drives: Employed in disk drive systems to monitor temperature.
- Automotive: Used in automotive applications for temperature sensing.
- Portable Medical Instruments: Ideal for medical devices that require accurate temperature measurement.
- Computers: Used in computer systems for temperature monitoring.
- Battery Management: Utilized in battery management systems to monitor temperature.
- Printers and FAX Machines: Employed in office equipment for temperature control.
- Mobile Phones: Used in mobile phone designs for temperature sensing.
- Power Supply Modules: Used in power supply modules to monitor temperature.
Q & A
- What is the operating temperature range of the LMT88?
The LMT88 operates over a temperature range of −55°C to 130°C.
- What is the supply voltage range for the LMT88?
The supply voltage range is 2.4 V to 5.5 V.
- What is the quiescent current of the LMT88?
The quiescent current is less than 10 μA.
- How accurate is the LMT88 at ambient temperature?
The accuracy is typically ±1.5°C at an ambient temperature of 30°C.
- What type of package is the LMT88 available in?
The LMT88 is available in an SC70 package.
- Can the LMT88 handle capacitive loads?
Yes, it can handle capacitive loads up to 300 pF without decoupling.
- What is the output impedance of the LMT88?
The maximum output impedance is 160 Ω.
- Is the LMT88 suitable for remote applications?
Yes, it is suitable for remote applications due to its low power consumption.
- How does the LMT88's temperature range change with supply voltage?
Decreasing the supply voltage to 2.4 V changes the negative extreme to −30°C, while the positive remains at 130°C.
- What is the shutdown current of the LMT88?
The shutdown current is 0.02 μA when V+ ≤ 0.8 V.
