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LM75 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM75
Description  Digital Temperature Sensor and Thermal WATCHDOG with Two-Wire Interface
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM75 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM75
Digital Temperature Sensor and Thermal Watchdog with
Two-Wire Interface
General Description
The LM75 is a temperature sensor, Delta-Sigma analog-to-
digital converter, and digital over-temperature detector with
I
2C® interface. The host can query the LM75 at any time to
read temperature. The open-drain Overtemperature Shut-
down (O.S.) output becomes active when the temperature
exceeds a programmable limit. This pin can operate in either
“Comparator” or “Interrupt” mode.
The host can program both the temperature alarm threshold
(T
OS) and the temperature at which the alarm condition goes
away (T
HYST). In addition, the host can read back the con-
tents of the LM75’s T
OS and THYST registers. Three pins (A0,
A1, A2) are available for address selection. The sensor
powers up in Comparator mode with default thresholds of
80˚C T
OS and 75˚C THYST.
The LM75’s 3.0V to 5.5V supply voltage range, low supply
current and I
2C interface make it ideal for a wide range of
applications. These include thermal management and pro-
tection applications in personal computers, electronic test
equipment, and office electronics.
Features
n
SOP-8 and Mini SOP-8 (MSOP) packages save space
n
I
2C Bus interface
n
Separate open-drain output pin operates as interrupt or
comparator/thermostat output
n
Register readback capability
n
Power up defaults permit stand-alone operation as
thermostat
n
Shutdown mode to minimize power consumption
n
Up to 8 LM75s can be connected to a single bus
n
UL Recognized Component
Key Specifications
j Supply Voltage
3.0V to 5.5V
j Supply Current
operating
250 µA (typ)
1 mA (max)
shutdown
4 µA (typ)
j Temperature Accuracy
−25˚C to 100˚C
±2˚C(max)
−55˚C to 125˚C
±3˚C(max)
Applications
n
System Thermal Management
n
Personal Computers
n
Office Electronics
n
Electronic Test Equipment
Simplified Block Diagram
01265801
I2C® is a registered trademark of Philips Corporation.
February 2004
© 2004 National Semiconductor Corporation
DS012658
www.national.com


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