Overview
The LM57TSPWRQ1, produced by Texas Instruments, is a precision, dual-output temperature switch with an integrated analog temperature sensor. This device is designed to provide accurate temperature monitoring and switching capabilities, making it suitable for a variety of applications, particularly in automotive and industrial environments. The LM57TSPWRQ1 features a wide operating temperature range of -50°C to 160°C and is available in an 8-pin TSSOP package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.4 | 5.5 | V | |
| Operating Temperature Range | -50 | 160 | °C | |
| Trip Point Accuracy (includes 1% set-resistor tolerance) | ±2.3 | °C | ||
| VTEMP Analog Temperature Sensor Output Accuracy | ±1.3 | °C | ||
| Hysteresis Temperature (THYST) | 9.6 | 10 | 10.6 | °C |
| Quiescent Supply Current (IS) | 24 | 29 | µA | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 183 | °C/W |
Key Features
- Resistor-Programmable Temperature Switch: The trip temperature is set by external resistors with zero error contribution from resistor tolerance.
- Dual-Output Temperature Switch: Features both push-pull and open-drain switch outputs.
- Very Linear Analog VTEMP Temp Sensor Output: Provides an accurate temperature sensor output with ±1.3°C accuracy from -50°C to 150°C.
- Wide Operating Temperature Range: Operates from -50°C to 160°C, making it suitable for harsh environments.
- Low Power Consumption: Minimizes self-heating to under 0.02°C.
- Short-Circuit Protected Analog and Digital Outputs: Ensures robust operation in various conditions.
- Latching Function for Digital Outputs: Allows for latching the output after it trips.
- TRIP-TEST Pin for In-System Testing: Enables verification of the comparator and output circuitry functionality after system assembly.
Applications
- Automotive Systems: Suitable for use in automotive environments due to its compliance with automotive grades and wide temperature range.
- Down Hole and Avionics: Used in applications requiring high reliability and accuracy in harsh temperature conditions.
- Industrial Automation: Ideal for temperature monitoring and control in industrial settings.
- Overtemperature Alarm Systems: Can be used to trigger alarms or take corrective actions when a specified temperature threshold is exceeded.
Q & A
- What is the operating temperature range of the LM57TSPWRQ1?
The LM57TSPWRQ1 operates from -50°C to 160°C.
- How is the trip temperature set for the LM57TSPWRQ1?
The trip temperature is set by external resistors connected to the SENSE1 and SENSE2 pins.
- What types of output does the LM57TSPWRQ1 provide?
The device provides both push-pull and open-drain digital outputs, along with an analog temperature sensor output.
- What is the accuracy of the VTEMP analog temperature sensor output?
The VTEMP output has an accuracy of ±1.3°C from -50°C to 150°C.
- How does the TRIP-TEST pin function?
The TRIP-TEST pin allows for in-system testing by asserting the digital outputs and providing the trip-level reference voltage at the VTEMP pin when set high.
- What is the quiescent supply current of the LM57TSPWRQ1?
The quiescent supply current is typically 24 µA to 29 µA.
- Is the LM57TSPWRQ1 protected against short circuits?
Yes, the device has short-circuit protected analog and digital outputs.
- Can the digital outputs be latched?
Yes, the digital outputs can be latched after they trip.
- What is the junction-to-ambient thermal resistance of the LM57TSPWRQ1?
The junction-to-ambient thermal resistance (RθJA) is 183 °C/W.
- In which package is the LM57TSPWRQ1 available?
The device is available in an 8-pin TSSOP package.
