Temperature Sensor, Monitor from Semtech

Semtech Corp.

The 3 by 3 mm, 8-pin SX8743 from Semtech Corp., Camarillo, CA, combines an integrated temperature sensor with monitoring electronics to connect up to 3 external temperature diodes, allowing it to monitor 4 temperature zones in servers, advanced printers, appliances, and other complex systems. The device drives the sensing diodes with a variable current and converts that into digital temperature information; precision is ±0.5°C typ., ±1.5°C max. on the external sensor. Addressed through SMBus or I²C, the monitor can autonomously set or reset alarms if the sensor temperature exceeds programmed thresholds, allowing for controlled cooling while the system is shut down. Operation is from 2.7–5.5 V with 250 µA at 10 Hz temperature sampling.