Overview
The LM57TPWR is a precision, dual-output temperature switch with an analog temperature sensor output, manufactured by Texas Instruments. This device is designed to provide accurate temperature monitoring and switching capabilities over a wide temperature range. It features a resistor-programmable trip point, allowing for 256 possible temperature settings using external 1% resistors. The LM57TPWR includes an internal reference DAC, analog temperature sensor, and analog comparator, making it suitable for various industrial and automotive applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.4 | - | 5.5 | V |
| Free Air Temperature Range | -50 | - | 150 | °C |
| Temperature Accuracy (TA = -50°C to 150°C) | - | - | ±1.3°C | - |
| Hysteresis | - | - | 10°C | - |
| Package Type | - | - | PW/TSSOP (8-pin) | - |
| Body Size | - | - | 3.00 mm × 6.40 mm | - |
| Junction-to-Ambient Thermal Resistance (RθJA) | - | - | 71.3 °C/W | - |
Key Features
- Resistor-programmable trip point with 256 possible settings using external 1% resistors.
- Analog temperature sensor output (VTEMP) proportional to temperature.
- Dual output: TOVER (active-high, push-pull) and TOVER (active-low, open-drain).
- Short-circuit protected analog and digital outputs.
- Latching function for digital outputs.
- TRIP-TEST pin for in-system testing.
- Low power consumption to minimize self-heating (under 0.02°C).
Applications
- Factory Automation
- Industrial
- Automotive
- Down Hole
- Avionics
- Telecom Infrastructure
Q & A
- What is the temperature range of the LM57TPWR? The LM57TPWR operates over a temperature range of -50°C to 150°C.
- How is the trip point set on the LM57TPWR? The trip point is set using two external 1% resistors connected to the SENSE1 and SENSE2 pins.
- What types of outputs does the LM57TPWR have? The LM57TPWR has two digital outputs (TOVER and TOVER) and one analog temperature sensor output (VTEMP).
- What is the purpose of the TRIP-TEST pin? The TRIP-TEST pin allows for in-system testing by asserting the digital outputs when set high and clearing them when set low.
- Is the LM57TPWR protected against short circuits? Yes, the LM57TPWR has short-circuit protected analog and digital outputs.
- What is the typical power consumption of the LM57TPWR? The LM57TPWR has low power consumption, minimizing self-heating to under 0.02°C.
- What are the package options for the LM57TPWR? The LM57TPWR is available in PW/TSSOP (8-pin) and WSON (8-pin) packages.
- What is the junction-to-ambient thermal resistance of the LM57TPWR in TSSOP package? The junction-to-ambient thermal resistance (RθJA) is 71.3 °C/W.
- Can the LM57TPWR be used in automotive applications? Yes, the LM57TPWR is available in automotive grades (e.g., LM57FQPWRQ1, LM57TQPWRQ1).
- How accurate is the temperature measurement of the LM57TPWR? The temperature accuracy of the LM57TPWR is ±1.3°C over the operating temperature range.
