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( File format: PDF, 793 Kbytes )
Dual Output Low Power Thermostat from the PowerWise? Family
National Semiconductor

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 5C typical hysteresis. The LM56 is available in an 8-lead Mini-SO8 surface mount package and an 8-lead small outline package.
Features

???Digital outputs support TTL logic levels
???Internal temperature sensor
???2 internal comparators with hysteresis
???Internal voltage reference
???Available in 8-pin SO and Mini-SO8 plastic packages




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