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LM75_05 Datasheet

  • LM75_05

  • National Semiconductor [Digital Temperature Sensor and Ther...

  • NSC

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LM75 Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
October 2005
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
2
C
廬
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
鈥淐omparator鈥?or 鈥淚nterrupt鈥?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鈥檚 T
OS
and T
HYST
registers. Three pins (A0,
A1, A2) are available for address selection. The sensor
powers up in Comparator mode with default thresholds of
80藲C T
OS
and 75藲C T
HYST
.
The LM75鈥檚 3.0V to 5.5V supply voltage range, low supply
current and I
2
C 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.
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
j
Supply Current
3.0V to 5.5V
operating
shutdown
250 碌A(chǔ) (typ)
1 mA (max)
4 碌A(chǔ) (typ)
j
Temperature Accuracy
鈭?5藲C to 100藲C
鈭?5藲C to 125藲C
鹵
2藲C(max)
鹵
3藲C(max)
Applications
n
n
n
n
System Thermal Management
Personal Computers
Office Electronics
Electronic Test Equipment
Features
n
SOP-8 and Mini SOP-8 (MSOP) packages save space
n
I
2
C Bus interface
n
Separate open-drain output pin operates as interrupt or
comparator/thermostat output
Simplified Block Diagram
01265801
I2C
廬
is a registered trademark of Philips Corporation.
漏 2005 National Semiconductor Corporation
DS012658
www.national.com

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