The LTC2995 from Linear Technology Corp., Milpitas, CA, is a temperature sensor and dual supply monitor for low-voltage systems. The device measures a remote diode's temperature with ±1°C accuracy and its own die temperature with ±2°C accuracy, while rejecting errors due to noise and series resistance. Two voltage rails, one of which must be between 2.25–5.5 V to power the device, are monitored with ±1.5% accuracy. Outputs include a voltage proportional-to-absolute-temperature (V_PTAT), individual undertemperature, overtemperature, undervoltage, and overvoltage alerts. Applications include system thermal control, energy harvesting, desktop and notebook computers, network servers, and environmental monitoring.