MAX6685

Dual-Output Remote-Junction Temperature Switches

Data Sheet (Rev. 2)

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Overview

Pin-Programmed Lower Temperature Threshold from +40°C to +80°C or +75°C to +115°C (5°C Increments)

Preset Upper Threshold: +120°C or +125°C

Open-Drain, Active-Low Output for Upper Temperature Alarm

CMOS Push-Pull, Active-High or Open-Drain, Active-Low Output for Lower Temperature Alarm

1.5°C Accuracy

3.0V to 5.5V, 200µA Supply

8-Pin µMAX Package

MAX6685/MAX6686 are dual-output temperature switches that use an external diode-connected transistor as a sensing element. These devices have two logic outputs (T_HIGH and T_LOW). T_HIGH asserts a logic signal when the remote temperature crosses the factory-programmed, +120°C, or +125°C upper trip threshold. T_LOW is asserted when the remote temperature exceeds the lower threshold, which is controlled by pins S1 and S2. The lower thresholds are available in two ranges in 5°C increments. The two ranges are +40°C to +80°C and +75°C to +115°C. Hysteresis for both outputs to be deasserted is typically 5°C.

T_HIGH is an open-drain, active-low output for both the MAX6685 and the MAX6686. T_LOW is a CMOS push-pull, active-high output for the MAX6685 and is an open-drain, active-low output for the MAX6686. They are available in a space-saving 8-pin µMAX package.

Applications