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PDF LM92 Data sheet ( Hoja de datos )
| Número de pieza | LM92 | |
| Descripción | 0.33C Accurate / 12-Bit Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM92 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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March 2000
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 I2C™ 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 THYST, 10˚C TLOW, 64˚C THIGH, 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
n Supply Current
n Temperature
Accuracy
n Linearity
n Resolution
operating
shutdown
30˚C
10˚C to 50˚C
−10˚C to 85˚C
125˚C
−25˚C to 150˚C
2.7V to 5.5V
350µA (typ)
625µA (max)
5µA (typ)
±0.33˚C(max)
±0.50˚C(max)
±1.0˚C(max)
±1.25˚C(max)
±1.5˚C(max)
±0.5˚C(max)
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.
© 2000 National Semiconductor Corporation DS101051
DS101051-1
www.national.com
1 page  
Electrical Characteristics (Continued)
Serial Bus Communication
DS101051-4
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its rated operating conditions.
Note 2: When the input voltage (VI) at any pin exceeds the power supplies (VI < GND or VI > +VS) the current at that pin should be limited to 5 mA. The 20 mA
maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four.
Note 3: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National Semicon-
ductor Linear Data Book for other methods of soldering surface mount devices.
Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.
Note 5: LM92 θJA (thermal resistance, junction-to-ambient) when attached to a printed circuit board with 2 oz. foil is 200 ˚C/W.
Note 6: While the LM92 has a full-scale-range in excess of 128 ˚C, prolonged operation at temperatures above 125 ˚C is not recommended.
Note 7: Typicals are at TA = 25 ˚C and represent most likely parametric norm.
Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
5 www.national.com
5 Page 
1.0 Functional Description (Continued)
DS101051-8
FIGURE 4. Inadvertent 8-Bit Read from 16-Bit Register where D7 is Zero (“0”)
11 www.national.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LM92.PDF ] | |
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