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ADT6401 and ADT6402 Temperature Switches
Low cost, 2.7 V to 5.5 V, pin-selectable temperature switch in SOT-23 from Analog Devices
ADI's ADT6401/ADT6402 are trip point temperature switches available in a 6-lead SOT-23 package. Each part contains an internal band gap temperature sensor for local temperature sensing. When the temperature crosses the trip point setting, the logic output is activated. The ADT6401 logic output is active low and open-drain. The ADT6402 logic output is active high and push-pull. The temperature is digitized to a resolution of 0.125°C (11-bit). The pin-selectable trip point settings are 10°C apart starting from -45°C to +5°C for undertemperature switching, and from +45°C to +115°C for overtemperature switching.
These devices typically consume 30 µA of supply current. Hysteresis is pin selectable at 2°C and 10°C. The temperature switch is specified to operate over the supply range of 2.7 V to 5.5 V.
When they're used for monitoring temperatures from -45°C to +115°C, the logic output pin becomes active when the temperature goes higher than the selected trip point temperature. When the ADT6401/ADT6402 are used for monitoring temperatures from -45°C to +5°C, the logic output pin becomes active when the temperature goes lower than the selected trip point temperature.
- Σ-Δ based temperature measurement gives high accuracy and noise immunity
- ±0.5°C typical accuracy from -45°C to +115°C
- Pin-selectable threshold settings from -45°C to +115°C in 10°C increments
- Supply voltage is 2.7 V to 5.5 V
- Supply current of 30 µA
- Space-saving, 6-lead SOT-23 package
- Pin-selectable temperature hysteresis of 2°C or 10°C
- Temperature resolution of 0.125°C
- Wide operating temperature range from -55°C to +125°C
- Medical equipment
- Automotive cell phones hard disk drives
- Personal computers
- Electronic test equipment
- Domestic appliances
- Process control
