SNIS153B – JULY 2009 – REVISED MARCH 2013
LM75B
LM75C Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
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FEATURES
No External Components Required
Shutdown Mode to Minimize Power
Consumption
Up to Eight LM75s Can be Connected to a
Single Bus
Power Up Defaults Permit Stand-alone
Operation as Thermostat
UL Recognized Component (LM75B and
LM75C)
DESCRIPTION
The LM75B and LM75C are industy-standard digital
temperature sensors with an integrated Sigma-Delta
analog-to-digital converter and I
2
C interface. The
LM75 provides 9-bit digital temperature readings with
an accuracy of ±2°C from -25°C to 100°C and ±3°C
over -55°C to 125°C.
Communication is accomplished over a 2-wire
interface which operates up to 400kHz. The LM75
has three address pins, allowing up to eight LM75
devices to operate on the same 2-wire bus. The
LM75 has a dedicated over-temperature output (O.S.)
with programmable limit and hystersis. This output
has programmable fault tolerance, which allows the
user to define the number of consecutive error
conditions that must occur before O.S. is activated.
The wide temperature and supply range and I
2
C
interface make the LM75 ideal for a number of
applications including base stations, electronic test
equipment, office electronics, personal computers,
and any other system where thermal management is
critical to performance. The LM75B and LM75C are
available in an SOIC package or VSSOP package.
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APPLICATIONS
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General System Thermal Management
Communications Infrastructure
Electronic Test Equipment
Environmental Monitoring
KEY SPECIFICATIONS
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Supply Voltage
– LM75B, LM75C: 3.0V to 5.5V
Supply Current
– Operating: 280
μA
(typ)
– Shutdown: 4
μA
(typ)
Temperature Accuracy
–
−25°C
to 100°C: ±2°C (max)
–
−55°C
to 125°C: ±3°C (max)
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright © 2009–2013, Texas Instruments Incorporated
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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