19-1852; Rev 1; 3/01
SOT23 Local Temperature Comparators
with SMBus Serial Interface
General Description
Features
The MAX1755/MAX1756 are temperature monitors with
±±3° aꢀꢀuraꢀcy eaꢀh with a ꢁuiꢂtꢃin ꢀomparator anꢄ
SMBus™ꢃꢀontroꢂꢂeꢄ variaꢁꢂe trip threshoꢂꢄ. This DA°ꢃ
programmaꢁꢂe threshoꢂꢄ aꢂꢂows speꢀifiꢀ thermaꢂ zones
anꢄ scstem responses to overtemperature ꢀonꢄitions to
ꢁe aꢄjusteꢄ unꢄer software ꢀontroꢂ. The MAX1755/
MAX1756 feature seriaꢂ programmaꢁiꢂitcy ꢂow ꢀosty wiꢄe
suppꢂcꢃvoꢂtage rangey anꢄ a tinc paꢀkage.
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° (ꢀ253° to ꢀ1ꢁꢁ3°)
±53° (ꢁ3° to ꢀ1253°)
The MAX1755 has a seꢂfꢃꢀꢂearing thermostat output
(OVERT)y anꢄ the MAX1756 has a ꢂatꢀheꢄ interrupt outꢃ
put (ALERT). A varietc of sꢂave aꢄꢄresses aꢂꢂow for up
to six ꢄeviꢀes per scstem (Taꢁꢂe ±).
o 2ꢁꢁµA (max) Supply °urrent
o ꢀ2.±75V to ꢀ5.5V Supply Range
o Tiny 6-Pin SOT2± Package
The MAX1755 has 43° of ꢁuiꢂtꢃin hcsteresis. The
MAX1756 ꢄeteꢀts ꢁoth ꢂowꢃtoꢃhigh anꢄ highꢃtoꢃꢂow temꢃ
perature transitions within an 83° temperature winꢄow.
This arrangement supports “winꢄowing” aꢂgorithms
where the ꢀomparison threshoꢂꢄ is reprogrammeꢄ “onꢃ
theꢃfꢂc.”
The MAX1755/MAX1756 are offereꢄ in the 6ꢃpin SOT2±
paꢀkage anꢄ are speꢀifieꢄ over the ꢃ403° to +1253°
temperature range. For other temperature sensors with
SMBus interfaꢀesy refer to the MAX1617y MAX1618y
MAX1668y anꢄ MAX1805 ꢄata sheets.
Ordering Information
TOP
MARK
PIN-
PACKAGE
PART*
TEMP RANGE
AANM
AANL
AANO
AANL
MAX1755AAUT-T
MAX1755BAUT-T
MAX1756AAUT-T
MAX1756BAUT-T
-403C to +1253C
-403C to +1253C
-403C to +1253C
-403C to +1253C
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
________________________Applications
Loꢀaꢂ Temperature Monitoring
*A and B suffixes on these devices select different combina-
tions of slave addresses. See Table 3 to determine the
appropriate suffix.
Desktop °omputers
Noteꢁook °omputers
Servers
Note: Requires a special solder temperature profile described
in the Absolute Maximum Ratings section.
Workstations
Memorc Moꢄuꢂes
Muꢂtiꢀhip Moꢄuꢂes
Inꢄustriaꢂ °ontroꢂ Scstems
Automotive
Typical Operating Circuit
+2.375V TO +5.5V
0.1µF
V
CC
10kΩ EACH
MAX1755
MAX1756
SMBCLK
CLOCK
DATA
SMBDATA
INTERRUPT TO µC
OVERT
(ALERT)
Pin Configurations appear at end of data sheet.
ADD GND
SMBus is a trademark of Intel Corp.
( ) ARE FOR MAX1756 ONLY.
________________________________________________________________ Maxim Integrated Products
1
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.