DESCRIPTION

· The LM57 is a precision, dual-output temperature switch with an analog temperature sensor output, designed for wide temperature industrial applications.
· It features a trip temperature (TTRIP) selectable from 256 possible values ranging from -40°C to 150°C, with an accuracy of ±1.7°C or ±2.3°C.
· The VTEMP output is a class AB analog voltage proportional to temperature with a programmable negative temperature coefficient (NTC).
· Two external resistors set the TTRIP and VTEMP slope, enabling system thermal event protection and monitoring.

FEATURES

· Trip temperature set by external resistors with resistor tolerance contributing zero error.
· Push-pull and open-drain switch outputs.
· Wide operating temperature range from -50°C to 150°C.
· Very linear analog VTEMP temperature sensor output with ±0.8°C or ±1.3°C accuracy.
· Short-circuit protected analog and digital outputs.
· Latching function for digital outputs.
· TRIP-TEST pin allows in-system testing.
· Low power minimizes self-heating to under 0.02°C.

APPLICATIONS

· Factory automation.
· Industrial applications.
· Automotive.
· Down hole.
· Avionics.
· Telecom infrastructure.