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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1755 Datasheet

SOT23 Local Temperature Comparators with SMBus Serial Interface

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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
VCC
MAX1755
MAX1756
SMBCLK
SMBDATA
OVERT
(ALERT)
ADD GND
10kEACH
CLOCK
DATA
INTERRUPT TO µC
( ) 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1755 Datasheet

SOT23 Local Temperature Comparators with SMBus Serial Interface

No Preview Available !

SOT23 Local Temperature Comparators
with SMBus Serial Interface
ABSOLUTE MAXIMUM RATINGS (Note 1)
VCC to GND ..............................................................-0.3V to +6V
ADD to GND ...............................................-0.3V to (VCC + 0.3V)
SMBCLK, SMBDATA, ALERT, OVERT to GND ........-0.3V to +6V
SMBDATA, ALERT, OVERT Current....................-1mA to +50mA
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW
Operating Temperature Range (extended) .......-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Note 1: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile to which the
device can be exposed during board-level solder attach and rework. The limit permits the use of only the solder profiles rec-
ommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3.3V, TA = 0°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
TEMPERATURE COMPARATOR AND POWER SUPPLY
DAC Resolution (Note 3)
Monotonicity guaranteed
Temperature Comparison Error
TA = +25oC to +100oC
TA = 0oC to +125oC
2 oC
-3 +3
oC
-5 +5
Temperature Hysteresis
Temperature Window
With respect to temperature comparison
value (MAX1755)
-4.5 -4 -3.5
oC
Lower threshold with respect to temperature
comparison value (MAX1756)
-9
-8
-7
Sampling Frequency
0.50 1 2.00 kHz
Supply Voltage Range
2.375
5.5 V
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
VCC input, rising edge
2.05 2.2 2.35
V
30 mV
Power-On Reset Threshold
Operating Supply Current
Standby Supply Current
ADD Input High Voltage
ADD Input Low Voltage
SMBus INTERFACE
Logic Input High Voltage
Logic Input Low Voltage
SMBus Output Low Sink Current
ALERT, OVERT Output Low Sink Current
ALERT, OVERT Output High Leakage Current
VCC, falling edge
SMBus static, logic inputs forced to VCC or GND
SMBus static, logic inputs forced to VCC or GND
0.2 1.7 2.3
85 200
0.8 4
0.8 x VCC
0.2 x VCC
V
µA
µA
V
V
SMBCLK, SMBDATA; VCC = 2.7V to 5.5V
SMBCLK, SMBDATA; VCC = 2.7V to 5.5V
SMBDATA forced to 0.4V; VCC = 2.7V to 5.5V
Pin forced to 0.4V
Pin forced to 5.5V
2.1
6
6
V
0.8 V
mA
mA
1 µA
Logic Input Current (ADD, SMBCLK, SMBDATA)
SMBus Input Capacitance
Inputs forced to VCC or GND
SMBCLK, SMBDATA
-1 +1 µA
5 pF
SMBus Clock Frequency
(Note 4)
DC 100 kHz
SMBCLK Clock Low Time
SMBCLK Clock High Time
tLOW, 10% to 10% points, VCC = 2.7V to 5.5V
tHIGH, 90% to 90% points, VCC = 2.7V to 5.5V
4.7
4
µs
µs
SMBus Rise Time
SMBCLK, SMBDATA; 10% to 90% points,
VCC = 2.7V to 5.5V
1 µs
2 _______________________________________________________________________________________


Part Number MAX1755
Description SOT23 Local Temperature Comparators with SMBus Serial Interface
Maker Maxim
Total Page 11 Pages
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