LM77CIMMX-3 National Semiconductor, LM77CIMMX-3 Datasheet

LM77CIMMX-3

Manufacturer Part Number

LM77CIMMX-3

Description

Manufacturer

National Semiconductor

Datasheets

1.LM77CIMMX-5.pdf (17 pages)

2.LM77CIMMX-3.pdf (17 pages)

3.LM77CIMMX-3.pdf (20 pages)

Specifications of LM77CIMMX-3

Case

MSOP-8

Date_code

MERA

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM77CIMMX-3

Manufacturer:

NS/国半

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM77CIMMX-3/NOPB

Manufacturer:

TI/德州仪器

Quantity:

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LM77

9-Bit + Sign Digital Temperature Sensor and Thermal

Window Comparator with Two-Wire Interface

General Description

The LM77 is a digital temperature sensor and thermal win-

dow comparator with an I

window-comparator architecture of the LM77 eases the de-

sign of temperature control systems conforming to the ACPI

(Advanced Configuration and Power Interface) specification

for personal computers. The open-drain Interrupt (INT) out-

put becomes active whenever temperature goes outside a

programmable window, while a separate Critical Tempera-

ture 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

T_CRIT.

The LM77’s 3.0V to 5.5V supply voltage range, Serial Bus

interface, 9-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, and HVAC applications.

I 2 C

is a registered trademark of Philips Corporation.

HYST

, 10˚C T

LOW

™

Serial Bus interface. The

, 64˚C T

DS100136

HIGH

, and 80˚C

Features

n Window comparison simplifies design of ACPI

n Serial Bus interface

n Separate open-drain outputs for Interrupt and Critical

n Shutdown mode to minimize power consumption

n Up to 4 LM77s can be connected to a single bus

n 9-bit + sign output; full-scale reading of over 128˚C

n SOP and MSOP 8-lead packages

Key Specifications

Applications

n System Thermal Management

n Personal Computers

n Office Electronics

n Electronic Test Equipment

n Automotive

n HVAC

Accuracy

compatible temperature monitoring and control.

Temperature shutdown

Supply Voltage

Supply Current

Temperature

operating

shutdown

−10˚C to 65˚C

−25˚C to 100˚C

−55˚C to 125˚C

500 µA (max)

www.national.com

3.0V to 5.5V

250 µA (typ)

1.5˚C(max)

5 µA (typ)

2˚C(max)

3˚C(max)

July 2001

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