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LM92 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM92
Description  ±0.33°C Accurate, 12-Bit Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM92 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM92
±0.33˚C Accurate, 12-Bit + Sign Temperature Sensor and
Thermal Window Comparator with Two-Wire Interface
General Description
The LM92 is a digital temperature sensor and thermal win-
dow comparator with an I
2CSerial Bus interface and an
accuracy of ±0.33˚C. The window-comparator architecture
of the LM92 eases the design of temperature control sys-
tems. The open-drain Interrupt (INT) output becomes active
whenever temperature goes outside a programmable win-
dow,
while
a
separate
Critical
Temperature
Alarm
(T_CRIT_A) output becomes active when the temperature
exceeds a programmable critical limit. The INT output can
operate in either a comparator or event mode, while the
T_CRIT_A output operates in comparator mode only.
The host can program both the upper and lower limits of the
window as well as the critical temperature limit. Program-
mable hysterisis as well as a fault queue are available to
minimize false tripping. Two pins (A0, A1) are available for
address selection. The sensor powers up with default thresh-
olds of 2˚C T
HYST,
10˚C T
LOW,
64˚C T
HIGH,
and 80˚C
T_CRIT.
The LM92’s 2.7V to 5.5V supply voltage range, Serial Bus in-
terface, 12-bit + sign output, and full-scale range of over
128˚C make it ideal for a wide range of applications. These
include thermal management and protection applications in
personal computers, electronic test equipment, office elec-
tronics, automotive, medical and HVAC applications.
Features
n
Window comparison simplifies design of ACPI
compatible temperature monitoring and control.
n
Serial Bus interface
n
Separate open-drain outputs for Interrupt and Critical
Temperature shutdown
n
Shutdown mode to minimize power consumption
n
Up to 4 LM92s can be connected to a single bus
n
12-bit + sign output
n
Operation up to 150˚C
Key Specifications
n
Supply Voltage
2.7V to 5.5V
n
Supply Current
operating
350µA (typ)
625µA (max)
shutdown
5µA (typ)
n
Temperature
30˚C
±0.33˚C(max)
Accuracy
10˚C to 50˚C
±0.50˚C(max)
−10˚C to 85˚C
±1.0˚C(max)
125˚C
±1.25˚C(max)
−25˚C to 150˚C
±1.5˚C(max)
n
Linearity
±0.5˚C(max)
n
Resolution
0.0625˚C
Applications
n
HVAC
n
Medical Electronics
n
Electronic Test Equipment
n
System Thermal Management
n
Personal Computers
n
Office Electronics
n
Automotive
Simplified Block Diagram
I2C® is a registered trademark of Philips Corporation.
DS101051-1
March 2000
© 2000 National Semiconductor Corporation
DS101051
www.national.com


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