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LM88

Factory Programmable Dual Remote-Diode Thermostat

General Description

The LM88 is a dual remote-diode temperature sensor with 3

digital comparators. The LM88 has 3 open-drain outputs

(O_SP0, O_SP1 and O_CRIT) that can be used as inter-

rupts or to signal system shutdown. The digital comparators

can be factory programmed to make a greater than or less

than comparison. When programmed for a greater than

comparison outputs:

O_SP0 and O_SP1 activate when the temperatures mea-

sured by D0 or D1 exceed the associated setpoints of

T_SP0 or T_SP1.

O_CRIT activates when the temperature measured by

either D0 or D1 exceeds setpoint T_CRIT.

T_CRIT can be set at 1˚C intervals from −40˚C to +125˚C.

T_SP0 and T_SP1 can be set at 4˚C intervals in the range of

T_CRIT +127˚C/−128˚C. Hysteresis for all comparators is

set to 1˚C. O_CRIT, in conjunction with T_CRIT, could be

used to prevent catastrophic damage to key subsystems

such as notebook Card Bus cards while O_SP0 and O_SP1,

in conjunction with T_SP0 and T_SP1, can warn of an

impending failure.

The LM88 is available in an 8-lead mini-small-outline pack-

age.

Applications

n Microprocessor Thermal Management

n Appliances

n Portable Battery Powered Systems

n Fan Control

n Industrial Process Control

n HVAC Systems

n Remote Temperature Sensing

n Electronic System Protection

Features

n 2 external remote diode input channels

n 3 digital comparator outputs, 1 per remote diode and

one T_CRIT common to both

n Factory programmable greater than or less than

comparisons

n 1˚C comparator hysteresis

n 2 setpoints, T_SP0 and T_SP1, factory programmable in

4˚C intervals

n 1 setpoint, T_CRIT, factory programmable in 1˚C

intervals

n Active Low open-drain digital outputs

n 8-pin mini-SO plastic package

Key Specifications

Power Supply Voltage 2.8V–3.8V

Power Supply Current 1.5 mA (max)

LM88 Temperature Range −40˚C to +85˚C

Diode Setpoint Temperature

Range 0˚C to +125˚C

Temperature Trip Point Accuracy:

Diode Junction

Temperature

)

LM88CIM

Accuracy

LM88CIM

Temperature

Range

+45˚C to +85˚C

3˚C (max) −40˚C to +85˚C

+60˚C to +100˚C

3˚C (max) −40˚C to +85˚C

Note: These are sample ranges. Contact factory for other

ranges.

Simplified Block Diagram and Connection Diagram

MSOP-8/MUA08A Package

10132601

Top View

10132602

For simplicity, the effects of the hysteresis are not shown in the

temperature response diagram.

August 2001

LM88 Factory Programmable Dual Remote-Diode Thermostat

1 2 3 4 5 6 7 8 9

Inhaltsverzeichnis

Seite 1 - Key Specifications

LM88Factory Programmable Dual Remote-Diode ThermostatGeneral DescriptionThe LM88 is a dual remote-diode temperature sensor with 3digital comparators.

Seite 2 - Typical Application

Simplified Block Diagram and Connection Diagram (Continued)Order Number DeviceMarkingNS PackageNumberTransportMediaT_SP0(˚C)T_SP1(˚C)T_CRIT(˚C)S etpoi

Seite 3 - Operating Ratings(Note 1)

Absolute Maximum Ratings (Note 1)Input Voltage 6VInput Current at any pin (Note 2) 5mAPackage Input Current (Note 2) 20mAPackage Dissipation at TA= 25

Seite 4 - 10132604

LM88 Electrical Characteristics (Continued)Note 2: When the input voltage (VI) at any pin exceeds the power supply (VI<GND or VI>V+), the curren

Seite 5

1.0 Functional Description1.1 PIN DESCRIPTIONSV+This is the positive supply voltage pin, which hasa range of 2.8 to 3.8 volts. This pin should bebypas

Seite 6 - 2.0 Application Hints

1.0 Functional Description (Continued)1.2 TYPICAL PIN CONNECTIONPin Label Pin Number Typical ConnectionD0+ 1 3904-type transistorshorted-collector bas

Seite 7 - Figure 3

2.0 Application Hints (Continued)of the LM88’s temperature. The LM88 has been optimized tomeasure the remote diode of a Pentium type processor asshown

Seite 8 - 3.0 Applications Circuits

2.0 Application Hints (Continued)8. The ideal place to connect the LM88’s GND pin is asclose as possible to the processor GND associated withthe sense

Seite 9

Physical Dimensions inches (millimeters)unless otherwise noted8-Lead Molded Mini Small Outline Package (MSOP)(JEDEC REGISTRATION NUMBER M0-187)Order N

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Rainbow-electronics LM88 Bedienungsanleitung

Stöbern Sie online oder laden Sie Bedienungsanleitung nach Sensoren Rainbow-electronics LM88 herunter. Rainbow Electronics LM88 User Manual Benutzerhandbuch

Inhaltsverzeichnis

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