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LM89 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM89
Description  ±0.75°C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM89 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM89
±0.75˚C Accurate, Remote Diode and Local Digital
Temperature Sensor with Two-Wire Interface
General Description
The LM89 is an 11-bit digital temperature sensor with a
2-wire System Management Bus (SMBus) serial interface.
The LM89 accurately measures its own temperature as well
as the temperature of an external device, such as processor
thermal diode or diode-connected transistor such as the
2N3904. The temperature of any ASIC can be accurately
determined using the LM89 as long as a dedicated diode
(semiconductor junction) is available on the target die. The
LM89 remote sensor accuracy of ±0.75˚C is factory trimmed
for the series resistance and 1.0021 typical non-ideality fac-
tor of the Intel® Pentium4 and the Mobile Pentium 4
Processor-M thermal diode. The LM89 has an Offset
register
to
allow
measuring
other
diodes
without
requiring
continuous
software
management.
Contact
hardware.monitor.team@nsc.com to obtain the latest data for
new processors.
The LM89 and the LM89-1 have the same functions but
different SMBus slave addresses. This allows for one of
each to be on the bus at the same time.
Activation of the ALERT output occurs when any tempera-
ture goes outside a preprogrammed window set by the HIGH
and LOW temperature limit registers or exceeds the T_CRIT
temperature limit. Activation of the T_CRIT_A occurs when
any temperature exceeds the T_CRIT programmed limit.
The LM89 is pin and register compatible with the LM86,
LM90, Analog Devices ADM1032 and Maxim MAX6657/8.
Features
n
Accurately senses die temperature of remote ICs or
diode junctions
n
Offset register allows sensing a variety of thermal
diodes accurately
n
On-board local temperature sensing
n
10 bit plus sign remote diode temperature data format,
0.125 ˚C resolution
n
T_CRIT_A output useful for system shutdown
n
ALERT output supports SMBus 2.0 protocol
n
SMBus 2.0 compatible interface, supports TIMEOUT
n
8-pin MSOP and SOIC packages
Key Specifications
j Supply Voltage
3.0 V to 3.6 V
j Supply Current
0.8 mA (typ)
j Local Temp Accuracy (includes quantization error)
T
A=25˚C to 125˚C
±3.0 ˚C (max)
j Remote Diode Temp Accuracy (includes quantization
error)
T
A=30˚C,TD=80˚C
±0.75 ˚C (max)
T
A=30˚C to 50˚C, TD=60˚C to 100˚C
±1.0 ˚C (max)
T
A=0˚C to 85˚C, TD=25˚C to 125˚C
±3.0 ˚C (max)
Applications
n
Processor/Computer System Thermal Management
(e.g. Laptop, Desktop, Workstations, Server)
n
Electronic Test Equipment
n
Office Electronics
Simplified Block Diagram
20041501
Pentiumis a trademark of Intel Corporation.
December 2004
© 2004 National Semiconductor Corporation
DS200415
www.national.com


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