General Description

The MAX1755/MAX1756 are temperature monitors with

±3°C accuracy, each with a built-in comparator and

SMBus™-controlled variable trip threshold. This DAC-

programmable threshold allows specific thermal zones

and system responses to overtemperature conditions to

be adjusted under software control. The MAX1755/

MAX1756 feature serial programmability, low cost, wide

supply-voltage range, and a tiny package.

The MAX1755 has a self-clearing thermostat output

(OVERT), and the MAX1756 has a latched interrupt out-

put (ALERT). A variety of slave addresses allow for up

to six devices per system (Table 3).

The MAX1755 has 4°C of built-in hysteresis. The

MAX1756 detects both low-to-high and high-to-low tem-

perature transitions within an 8°C temperature window.

This arrangement supports “windowing” algorithms

where the comparison threshold is reprogrammed “on-

the-fly.”

The MAX1755/MAX1756 are offered in the 6-pin SOT23

package and are specified over the -40°C to +125°C

temperature range. For other temperature sensors with

SMBus interfaces, refer to the MAX1617, MAX1618,

MAX1668, and MAX1805 data sheets.

________________________Applications

Local Temperature Monitoring

Desktop Computers

Notebook Computers

Servers

Workstations

Memory Modules

Multichip Modules

Industrial Control Systems

Automotive

Features

o Programmable Temperature Threshold

o Built-In Hysteresis

o SMBus 2-Wire Serial Interface

o OVERT Thermostat Output (MAX1755)

o ALERT Interrupt Output (MAX1756)

o Threshold Accuracy

±3°C (+25°C to +100°C)

±5°C (0°C to +125°C)

o 200µA (max) Supply Current

o +2.375V to +5.5V Supply Range

o Tiny 6-Pin SOT23 Package

SOT23 Local Temperature Comparators

with SMBus Serial Interface

________________________________________________________________ Maxim Integrated Products

1

19-1852; Rev 1; 3/01

*A and B suffixes on these devices select different combina-

tions of slave addresses. See Table 3 to determine the

appropriate suffix.

Note: Requires a special solder temperature profile described

in the Absolute Maximum Ratings section.

SMBus is a trademark of Intel Corp.

Ordering Information

PART*

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX1755AAUT-T

-40°C to +125°C6 SOT23-6

AANM

MAX1755BAUT-T

-40°C to +125°C6 SOT23-6

AANL

MAX1756AAUT-T

-40°C to +125°C6 SOT23-6AANO

MAX1756BAUT-T

-40°C to +125°C6 SOT23-6

AANL

SMBCLK

SMBDATA

CLOCK

10k

Ω EACH

DATA

INTERRUPT TO

µC

+2.375V TO +5.5V

ADD

GND

0.1

µF

OVERT

MAX1755

MAX1756

( ) ARE FOR MAX1756 ONLY.

(ALERT)

Typical Operating Circuit

Pin Configurations appear at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.