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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
Logo NSC - National Semiconductor (TI)

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
2C? Serial 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
350A (typ)
625A (max)
shutdown
5A (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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