LM56_15 Datasheet, PDF (1/22 Pages) Texas Instruments – LM56 Dual Output Low Power Thermostat

LM56
www.ti.com
SNIS120G – APRIL 2000 – REVISED FEBRUARY 2013
LM56 Dual Output Low Power Thermostat
Check for Samples: LM56
FEATURES
1
•2 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 (V_T1 and V_T2) 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–T_HYST).
Similarly, OUT2 goes LOW when the temperature
exceeds T2 and goes HIGH when the temperature
goes below (T2–T_HYST). T_HYST 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.
Table 1. Key Specifications
Power Supply Voltage
Power Supply Current
V_REF
Hysteresis Temperature
Internal Temperature Sensor Output Voltage
VALUE
2.7V–10
230
1.250
5
(+6.20 mV/°C x T) +
395 mV
UNIT
V
μA (max)
V ±1% (max)
°C
mV
Table 2. Temperature Trip Point Accuracy
+25°C
+25°C to +85°C
−40°C to +125°C
LM56BIM
±2°C (max)
±2°C (max)
±3°C (max)
LM56CIM
±3°C (max)
±3°C (max)
±4°C (max)
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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