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, set by external resistors.

· The VTEMP output is a class AB analog voltage proportional to temperature with a programmable negative temperature coefficient (NTC).

· It includes built-in thermal hysteresis (THYST) to prevent digital output oscillation and supports both push-pull and open-drain switch outputs.

FEATURES

· Trip temperature set by external resistors with an accuracy of ±1.7°C or ±2.3°C from -40°C to +150°C.

· Resistor tolerance contributes zero error at 1%.

· 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 from -50°C to +150°C.

· Short-circuit protected analog and digital outputs.

· Latching function for digital outputs and a TRIP-TEST pin for in-system testing.

· Low power consumption minimizes self-heating to under 0.02°C.

APPLICATIONS

· Factory automation and industrial applications.

· Automotive systems.

· Down-hole and avionics equipment.

· Telecom infrastructure.