Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23

The MAX6501–MAX6504 low-cost, fully integrated temperature switches assert a logic signal when their die temperature crosses a factory-programmed threshold. Operating from a +2.7V to +5.5V supply, these devices feature two on-chip, temperature-dependent voltage references and a comparator. They are available with factory-trimmed temperature trip thresholds from -45°C to +125°C in 10°C increments, and are accurate to ±0.5°C (typ) or ±6°C (max). These devices require no external components and typically consume 30µA supply current. Hysteresis is pin-selectable at 2°C or 10°C.

The MAX6501/MAX6503 have an active-low, open-drain output intended to interface with a microprocessor (µP) reset input. The MAX6502/MAX6504 have an active-high, push-pull output intended to directly drive fan-control logic. The MAX6501/MAX6502 are offered with hot-temperature thresholds (+35°C to +125°C), asserting when the temperature is above the threshold. The MAX6503/MAX6504 are offered with cold-temperature thresholds (-45°C to +15°C), asserting when the temperature is below the threshold.

The MAX6501–MAX6504 are offered in eight standard temperature versions; contact the factory for pricing and availability of nonstandard temperature versions. They are available in 5-pin SOT23 package.

Applications

* µP Temperature Monitoring in High-Speed Computers * Fan Control * Temperature Alarms * Temperature Control

* ±0.5°C (typical) Threshold Accuracy Over Full Temperature Range

* No External Components Required

* Low Cost

* 30µA Supply Current

* Factory-Programmed Thresholds from -45°C to +125°C in 10°C Increments

* Open-Drain Output (MAX6501/MAX6503) Push-Pull Output (MAX6502/MAX6504)

* Pin-Selectable 2°C or 10°C Hysteresis

* SOT23-5 Package