●The LM77 is a digital temperature sensor and thermal window comparator with an I2C Serial Bus interface. The window-comparator architecture of the LM77 eases the design of temperature control systems conforming to the ACPI (Advanced Configuration and Power Interface) specification for personal computers. The open-drain Interrupt (INT) output becomes active whenever temperature goes outside a programmable window, while a separate Critical Temperature Alarm (T_CRIT_A) output becomes active when the temperature exceeds a programmable critical limit. The INT output can operate in either a comparator or event mode, while the T_CRIT_A output operates in comparator mode only.
●The host can program both the upper and lower limits of the window as well as the critical temperature limit. Programmable hysterisis as well as a fault queue are available to minimize false tripping. Two pins (A0, A1) are available for address selection. The sensor powers up with default thresholds of 2°C THYST, 10°C TLOW, 64°C THIGH, and 80°C T_CRIT.
●The LM77"s 3.0V to 5.5V supply voltage range, Serial Bus interface, 9-bit + sign output, and full-scale range of over 128°C make it ideal for a wide range of applications. These include thermal management and protection applications in personal computers, electronic test equipment, office electronics, automotive, and HVAC applications.
● Window Comparison Simplifies Design of ACPI Compatible Temperature Monitoring and Control.
● Serial Bus Interface
● Separate Open-Drain Outputs for Interrupt and Critical Temperature Shutdown
● Shutdown Mode to Minimize Power Consumption
● Up to 4 LM77s Can be Connected to a Single Bus
● 9-bit + Sign Output; Full-Scale Reading of Over 128°C
● SOIC and VSSOP 8-lead Packages
●## Key Specifications
● Supply Voltage 3.0V to 5.5V
● Supply Current
● Operating250 μA (typ)500 μA (max)
● Shutdown5 μA (typ)
● Temperature Accuracy
● −10°C to 65°C, ±1.5°C(max)
● −25°C to 100°C, ±2°C(max)
● −55°C to 125°C, ±3°C(max)
●All trademarks are the property of their respective owners.
Part 3D Model
