© Semiconductor Components Industries, LLC, 1999

February, 2000 – Rev. 0

1

Publication Order Number:

LM75/D

LM75

2-Wire Serial Temperature

Sensor and Monitor

The LM75 is a serially programmable temperature sensor that

notifies the host controller when ambient temperature exceeds a

user–programmed setpoint. Hysteresis is also programmable. The

INT/CMPTR output is programmable as either a simple comparator

for thermostat operation or as a temperature event interrupt.

Communication with the LM75 is accomplished via a two–wire bus

that is compatible with industry standard protocols. This permits

reading the current temperature, programming the setpoint and

hysteresis, and configuring the device.

The LM75 powers up in Comparator Mode with a default setpoint

of 80

°C with 5°C hysteresis. Defaults allow independent operation as

a stand–alone thermostat. A shutdown command may be sent via the

2–wire bus to activate the low–power standby mode. Address

selection inputs allow up to eight LM75’s to share the same 2–wire bus

for multi–zone monitoring.

All registers can be read by the host and the INT/CMPTR output’s

polarity is user programmable. Both polled and interrupt driven

systems are easily accommodated. Small physical size, low installed

cost, and ease of use make the LM75 an ideal choice for implementing

sophisticated system management schemes.

Features

Power–up Defaults

Thermostat Output

Shutdown Mode

Typical Applications

Computers

Telecom Racks

Power Supplies / UPS

Micro8

DM SUFFIX

CASE TBD

PRELIMINARY INFORMATION

http://onsemi.com

PIN CONFIGURATION

(Top View)

Device

Package

Shipping

ORDERING INFORMATION

LM75DM–33R2

Micro–8

2500 Tape/Reel

1

2

3

4

SDA

SCL

INT/CMPTR

GND

8

7

6

5

V

A0

A1

A2

DD

LM75

LM75DM–50R2

Micro–8

2500 Tape/Reel