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LM84 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM84
Description  Diode Input 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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LM84 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM84
Diode Input Digital Temperature Sensor with Two-Wire
Interface
General Description
The
LM84
is
a
remote
diode
temperature
sensor,
Delta-Sigma
analog-to-digital
converter,
and
digital
over-temperature detector with an SMBusinterface. The
LM84 senses its own temperature as well as the tempera-
ture of a target IC with a diode junction, such as a Pentium®
II processor or a diode connected 2N3904. A diode junction
(semiconductor junction) is required on the target IC’s die. A
host can query the LM84 at any time to read the temperature
of this diode as well as the temperature state of the LM84
itself. A T_CRIT_A interrupt output becomes active when the
temperature is greater than a programmable comparator
limit, T_CRIT.
The host can program as well as read back the state of the
T_CRIT register. Three state logic inputs allow two pins
(ADD0, ADD1) to select up to 9 SMBus address locations for
the LM84. The sensor powers up with default thresholds of
127˚C for T_CRIT.
Features
n
Directly senses die temperature of remote ICs
n
Senses temperature of remote diodes
n
SMBus compatible interface, supports SMBus Timeout
n
Register readback capability
n
7 bit plus sign temperature data format
n
2 address select lines enable 9 LM84s to be connected
to a single bus
Key Specifications
j Supply Voltage
3.0V - 3.6V
j Supply Current
1 mA (max)
j Local Temperature Accuracy
±1.0˚C (typ)
j Remote Diode Temperature Accuracy
+60˚C to +100˚C
±3˚C (max)
0˚C to +125˚C
±5˚C (max)
Applications
n
System Thermal Management
n
Personal Computers
n
Electronic Test Equipment
n
Office Electronics
n
HVAC
Simplified Block Diagram
SMBusis a trademark of the Intel Corporation.
Pentium® II processor is a registered trademark of the Intel Corporation.
I2C® is a registered trademark of the Philips Corporation.
DS100961-1
# Indicates Active Low (”NOT“)
July 2000
© 2001 National Semiconductor Corporation
DS100961
www.national.com


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