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See Technical Specifications

LM57CISD-10/NOPB +BOM

Thermostat Programmable Active High, Active Low Open Drain, Push-Pull 8-WSON (2.5x2.5)

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LM57CISD-10/NOPB
Datasheet:

LM57CISD-10/NOPB Datasheet (PDF)
Trip Temperature Threshold:

Hot
Switching Temperature:

Programmable
Accuracy:

±2.3°C
Output Type:

Open Drain, Push-Pull
EDA/CAD Models:

Request Free CAD Models for LM57CISD-10/NOPB

LM57CISD-10/NOPB General Description

The LM57 device is a precision, dual-output, temperature switch with analog temperature sensor output for wide temperature industrial applications. The trip temperature (T_TRIP) is selected from 256 possible values in the range of –40°C to +150°C. The V_TEMP is a class AB analog voltage output that is proportional to temperature with a programmable negative temperature coefficient (NTC). Two external 1% resistors set the T_TRIP and V_TEMP slope. The digital and analog outputs enable protection and monitoring of system thermal events.

Built-in thermal hysteresis (T_HYST) prevents the digital outputs from oscillating. The T_OVER and T_OVER digital outputs will assert when the die temperature exceeds T_TRIP and will de-assert when the temperature falls below a temperature equal to T_TRIP minus T_HYST.

T_OVER is active-high with a push-pull structure. T_OVER is active-low with an open-drain structure. Tying T_OVER to TRIP-TEST will latch the output after it trips. The output can be cleared by forcing TRIP-TEST low. Driving the TRIP-TEST high will assert the digital outputs. A processor can check the state of T_OVER or T_OVER, confirming they changed to an active state. This allows for in-situ verification that the comparator and output circuitry are functional after system assembly. When TRIP-TEST is high, the trip-level reference voltage appears at the V_TEMP pin. The system could then use this voltage to calculate the threshold of the LM57.

Key Features

Robust Packaging
Durable Construction
Fault Tolerance Design

Specifications

Category	Sensors, TransducersTemperature SensorsThermostats - Solid State	Series	-
Trip Temperature Threshold	Hot	Switching Temperature	Programmable
Accuracy	±2.3°C	Current - Output (Max)	-
Output Type	Open Drain, Push-Pull	Output	Active High, Active Low
Output Function	OverTemp, /OverTemp	Selectable Hysteresis	Yes
Features	Selectable Trip Point, Trip Test	Voltage - Supply	2.4 V ~ 5.5 V
Current - Supply	24µA	Operating Temperature	-50°C ~ 150°C
Mounting Type	Surface Mount	Base Product Number	LM57