LM92 Datasheet | National Semiconductor

Description The LM92 is a digital temperature sensor and thermal window parator with an I2C™ Serial Bus interface and an accuracy of ± 0.33˚C. The window-parator architecture of the LM92 eases the design of temperature control systems. The open-drain Interrupt (INT) output bees active whenever temperature goes outside a programmable window, while a separate Critical Temperature Alarm (T_CRIT_A) output bees active when the temperature exceeds a programmable critical limit. The INT output can operate in either a parator or event mode, while the T_CRIT_A output operates in parator mode only. The host can program both the upper and lower limits of the window as well as the critical temperature limit. Programmable hysterisis as well as a fault queue are available to minimize false tripping. Two pins (A0, A1) are available for address selection. The sensor powers up with default thresholds of 2˚C THYST, 10˚C TLOW, 64˚C THIGH, and 80˚C T_CRIT. The LM92’s 2.7V to 5.5V supply voltage range, Serial Bus interface, 12-bit + sign output, and full-scale range of over 128˚C make it ideal for a wide range of applications. These include thermal management and protection applications in personal puters, electronic test equipment, office electronics, automotive, medical and HVAC applications. n n n n Shutdown mode to minimize power consumption Up to 4 LM92s can be connected to a single bus 12-bit + sign output Operation up to 150˚C Key Specifications n Supply Voltage n Supply Current operating shutdown n Temperature Accuracy 30˚C 10˚C to 50˚C - 10˚C to 85˚C 125˚C - 25˚C to 150˚C n Linearity n Resolution 2.7V to 5.5V 350µA (typ) 625µA (max) 5µA (typ) ± 0.33˚C(max) ± 0.50˚C(max) ± 1.0˚C(max) ± 1.25˚C(max) ± 1.5˚C(max) ± 0.5˚C(max) 0.0625˚C Applications n n n n n n n HVAC Medical Electronics Electronic Test Equipment System Thermal Management Personal puters Office Electronics Automotive Features n Window parison simplifies design of ACPI patible temperature monitoring and control. n...