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鈥損rogrammed 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鈥搘ire 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擄C with 5擄C hysteresis. Defaults allow independent operation as
a stand鈥揳lone thermostat. A shutdown command may be sent via the
2鈥搘ire bus to activate the low鈥損ower standby mode. Address
selection inputs allow up to eight LM75鈥檚 to share the same 2鈥搘ire bus
for multi鈥搝one monitoring.
All registers can be read by the host and the INT/CMPTR output鈥檚
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
鈥?/div>
Temperature Sensing: 0.5擄C Accuracy (Typ.)
鈥?/div>
Operates from: 鈥?5擄C to +125擄C
鈥?/div>
Operating Range: 2.7 V 鈥?5.5 V
鈥?/div>
Programmable Trip Point and Hysteresis with
Power鈥搖p Defaults
鈥?/div>
Standard 2鈥揥ire Serial Interface
鈥?/div>
Thermal Event Alarm Output Functions as Interrupt or Comparator /
Thermostat Output
鈥?/div>
Up to 8 LM75鈥檚 May Share the Same Bus
鈥?/div>
Shutdown Mode for Low Standby Power Consumption
鈥?/div>
5.0 V Tolerant I/O at V
DD
= 3.0 V
鈥?/div>
Low Power 250
碌A(chǔ)
(Typ.) Operating, 1.0
碌A(chǔ)
(Typ.)
Shutdown Mode
Typical Applications
鈥?/div>
Thermal Protection for High Performance CPUs
鈥?/div>
Solid鈥揝tate Thermometer
鈥?/div>
Fire/Heat Alarms
鈥?/div>
Thermal Management in Electronic Systems:
Computers
Telecom Racks
Power Supplies / UPS
鈥?/div>
Copiers / Office Electronics
鈥?/div>
Consumer Electronics / Amplifiers
鈥?/div>
Process Control
http://onsemi.com
Micro8t
DM SUFFIX
CASE TBD
PIN CONFIGURATION
(Top View)
SDA 1
SCL 2
INT/CMPTR 3
GND 4
LM75
8 V DD
7 A0
6 A1
5 A2
ORDERING INFORMATION
See detailed ordering and shipping information on page 10 of
this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 10 of this data sheet.
漏
Semiconductor Components Industries, LLC, 2000
1
September, 2000 鈥?Rev. 1
Publication Order Number:
LM75/D
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