FEATURES
• Digital Outputs Support TTL Logic Levels
• Internal Temperature Sensor
• 2 Internal Comparators with Hysteresis
• Internal Voltage Reference
• Available in 8-pin SOIC and VSSOP Packages

APPLICATIONS
• Microprocessor Thermal Management
• Appliances
• Portable Battery Powered 3.0V or 5V Systems
• Fan Control
• Industrial Process Control
• HVAC Systems
• Remote Temperature Sensing
• Electronic System Protection

DESCRIPTION
The LM56 is a precision low power thermostat. Two
stable temperature trip points (VT1 and VT2) are
generated by dividing down the LM56 1.250V
bandgap voltage reference using 3 external resistors.
The LM56 has two digital outputs. OUT1 goes LOW
when the temperature exceeds T1 and goes HIGH when the the temperature goes below (T1–THYST).
Similarly, OUT2 goes LOW when the temperature
exceeds T2 and goes HIGH when the temperature
goes below (T2–THYST). THYST is an internally set 5°C
typical hysteresis.
The LM56 is available in an 8-lead VSSOP surface
mount package and an 8-lead SOIC.