The MAX6646/MAX6647/MAX6649 provide two system alarms: ALERT and OVERT. ALERT asserts when any of four temperature conditions are violated: local overtemperature, remote overtemperature, local undertemperature, or remote undertemperature. OVERT asserts when the temperature rises above the value in either of the two OVERT limit registers. The OVERT output can be used to activate a cooling fan, or to trigger a system shutdown. Measurements can be done autonomously, at the programmed conversion rate, or in a single-shot mode. The adjustable conversion rate allows optimizing supply current and temperature update rate to match system needs. Remote accuracy is 1C maximum error between +60C and +145C with no calibration needed. The MAX6646/MAX6647/MAX6649 operate from -55C to +125C, and measure temperatures between 0C and +145C. The MAX6646/MAX6647/MAX6649 are available in an 8-pin MAX package.