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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

™

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

Supply Voltage 2.7V to 5.5V

Supply Current operating 350µA (typ)

625µA (max)

shutdown 5µA (typ)

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)

Linearity

0.5˚C(max)

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

is a registered trademark of Philips Corporation.

DS101051-1

March 2000

LM92

0.33˚C Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator with

Two-Wire Interface

1 2 3 4 5 6 ... 17 18

Indice de contenidos

Pagina 1 - Two-Wire Interface

LM92±0.33˚C Accurate, 12-Bit + Sign Temperature Sensor andThermal Window Comparator with Two-Wire InterfaceGeneral DescriptionThe LM92 is a digital te

Pagina 2 - Connection Diagram

1.0 Functional Description (Continued)The maximum resistance of the pull up, based on LM92specification for High Level Output Current, to provide a 2v

Pagina 3 - Electrical Characteristics

1.0 Functional Description (Continued)DS101051-8FIGURE 4. Inadvertent 8-Bit Read from 16-Bit Register where D7 is Zero (“0”)LM92www.national.com11

Pagina 4

1.0 Functional Description (Continued)1.9 POINTER REGISTER(Selects which registers will be read from or written to):P7 P6 P5 P4 P3 P2 P1 P000000 Regis

Pagina 5 - Serial Bus Communication

1.0 Functional Description (Continued)1.13 Manufacturer’s Identification Register(Read only):D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D01000

Pagina 6 - DS101051-21

2.0 I2C Timing DiagramsDS101051-9Typical 2-Byte Read From Preset Pointer Location Such as Temp or Comparison RegistersDS101051-10Typical Pointer Set F

Pagina 7

3.0 Application HintsThe temperature response graph inFigure 7depicts a typi-cal application designed to meet ACPI requirements. In thistype of applic

Pagina 8 - Figure 3

4.0 Typical ApplicationsDS101051-16FIGURE 8. Typical ApplicationDS101051-17FIGURE 9. Remote HVAC temperature sensor communicates via 3 wires, includin

Pagina 9 - DS101051-6

4.0 Typical Applications (Continued)DS101051-19FIGURE 10. ACPI Compatible Terminal Alarm Shutdown. By powering the LM92 from auxilary output of the po

Pagina 10 - Figure 4

Physical Dimensions inches (millimeters) unless otherwise notedLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENT

Pagina 11 - (Continued)

Connection DiagramOrdering InformationOrder Number Supply Voltage Supplied AsLM92CIM 2.7V to 5.5VLM92CIMX 2.7V to 5.5V 2500 Units on Tape and ReelPin

Pagina 12 - Section 1.1

Absolute Maximum Ratings (Note 1)Supply Voltage −0.3 V to 6.5VVoltage at any Pin −0.3 Vto (+VS+ 0.3V)Input Current at any Pin 5mAPackage Input Current

Pagina 13

Electrical CharacteristicsDIGITAL DC CHARACTERISTICSUnless otherwise noted, these specifications apply for +VS=+2.7V to +5.5V for LM92CIM .Boldface li

Pagina 14 - C Timing Diagrams

Electrical Characteristics (Continued)Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electric

Pagina 15 - Figure 7

Electrical Characteristics (Continued)Note 9: The limits found in the following table supersede the limits shown in the Electrical Characteristics Tab

Pagina 16 - 4.0 Typical Applications

Electrical Characteristics (Continued)Note 11: Linearity Error is defined as the worse case difference of an actual reading to that of a calculated re

Pagina 17

1.0 Functional DescriptionThe LM92 temperature sensor incorporates a band-gap typetemperature sensor, 13-bit ADC, and a digital comparatorwith user-pr

Pagina 18

1.0 Functional Description (Continued)Therefore, the complete slave address is:10010A1A0MSB LSB1.4 TEMPERATURE DATA FORMATTemperature data can be read

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