- Trip temperature set by external resistor
- The tolerance of the external resistor contributes to zero error
- Push-pull and open-drain temperature switch outputs
- Wide operating temperature and trip temperature range of -50°C to 150°C
- Very linear analog V temperature temperature sensor output
- Analog and digital output short-circuit protection
- The TRIP-TEST pin allows for testing on the system
- Digital output latching function
- Very small 2.5 mm 2.5 mm 8-pin LLP package
illustrate
The LM57 is a precision-integrated analog temperature sensor with temperature switch and dual outputs. The trip temperature (T trip) is programmable by using two external 1% resistors. Using a very small package resistor (0.5 mm x 1 mm), the LM57 can be programmed to any 256 temperature while consuming very little board space. The V temperature output provides an analog output voltage, which is proportional to the temperature measured with a negative temperature coefficient (NTC).
Built-in temperature hysteresis (T HYST) thermal oscillation to keep the output stable. The digital temperature switch output will go when the die temperature exceeds T trip, and will release when the temperature is lower than a certain temperature is equal to T tripping minus T HYST drop. The digital output, more than one ton, is a highly effective push-pull structure. ^ TOVER, Other Digital Outputs, Low Active Active, Open Drain Construction.
The driving stroke test input high will make the digital output. A processor can read the logic level output by the temperature switch, confirming that they change their positive state. This allows for in-situ verification, comparison, and output of circuit functionality after system assembly. When the TEST pin is high, the step-skipping reference voltage appears on the VTEMP pin. The system can use this voltage to calibrate the sensor more tightly. The bundling is handed over to the trip test T to output the latch after the number of people. It can clear LM57 that forces tripping tests low or closed.
Since it consumes only 28μA and its maximum supply, it has a very low self-heating, approximately 0.02°C, still air.
Key specifications:
Supply voltage
|
2.4V to 5.5V
|
Supply current
|
24μA (typical)
|
Temperature switching accuracy
|
± 1.5 ° C。 |
Analog (V-temperature) accuracy
|
± 0.7℃ |
Operating temperature
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-50°C to 150°C
|
The lag range
|
5℃,10℃ |
apply
- cell phone
- Wireless transceiver
- Digital camera
- Personal Digital Assistant (PDA)
- Battery management
- Car
- disk drive
- Game
- household appliance
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