MAX1755 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – SOT23 Local Temperature Comparators with SMBus Serial Interface

19-1852; Rev 1; 3/01
SOT23 Local Temperature Comparators
with SMBus Serial Interface
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
Pin Configurations appear at end of data sheet.
SMBus is a trademark of Intel Corp.
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
Ordering Information
PART*
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX1755AAUT-T -40°C to +125°C 6 SOT23-6 AANM
MAX1755BAUT-T -40°C to +125°C 6 SOT23-6 AANL
MAX1756AAUT-T -40°C to +125°C 6 SOT23-6 AANO
MAX1756BAUT-T -40°C to +125°C 6 SOT23-6 AANL
*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.
Typical Operating Circuit
0.1µF
+2.375V TO +5.5V
V_CC
MAX1755
MAX1756
SMBCLK
SMBDATA
OVERT
(ALERT)
ADD GND
10kΩ EACH
CLOCK
DATA
INTERRUPT TO µC
( ) ARE FOR MAX1756 ONLY.
________________________________________________________________ Maxim Integrated Products 1
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