19-4385; Rev 0; 3/09
Digital Temperature Sensor and Thermal
Watchdog with 2-Wire Interface
LM75
General Description
Features
o SO (SOP) and µMAX® (µSOP) Packages
o I2C Bus Interface
The LM75 temperature sensor includes a delta-sigma
analog-to-digital converter, and a digital overtempera-
ture detector. The host can query the LM75 through its
o Separate Open-Drain OS Output Operates as
2
I C interface to read temperature at any time. The
Interrupt or Comparator/Thermostat Input
open-drain overtemperature output (OS) sinks current
when the programmable temperature limit is exceeded.
The OS output operates in either of two modes, com-
parator or interrupt. The host controls the temperature
o Register Readback Capability
o Power-Up Defaults Permit Stand-Alone Operation
as a Thermostat
o 3.0V to 5.5V Supply Voltage
at which the alarm is asserted (T ) and the hysteresis
OS
temperature below which the alarm condition is not
o Low Operating Supply Current 250µA (typ), 1mA
valid (T
). Also, the LM75’s T
and T
regis-
HYST
HYST
OS
(max)
ters can be read by the host. The address of the LM75
is set with three pins to allow multiple devices to work
on the same bus. Power-up is in comparator mode, with
o 4µA (typ) Shutdown Mode Minimizes Power
Consumption
o Up to Eight LM75s Can Be Connected to a Single
defaults of T
= +80°C and T
= +75°C. The 3.0V
OS
HYST
Bus
to 5.5V supply voltage range, low supply current, and
2
I C interface make the LM75 ideal for many applica-
o Pin- and/or Register-Compatible with Improved-
Performance Maxim Sensors Including MAX7500,
MAX6625, MAX6626, DS75LV, and DS7505
tions in thermal management and protection.
Applications
Thermal System Management
Thermal Protection
Functional Diagram
+V = 3.0V to 5.5V
S
Test Equipment
Computers and Office Electronics
8
3
OS
16
16
SILICON
BANDGAP
TEMPERATURE
SENSOR
SET POINT
COMPARATOR W/
HYSTERESIS
9-BIT DELTA-
SIGMA ADC
µMAX is a registered trademark of Maxim Integrated Products, Inc.
TOS SET POINT
REGISTER
Pin Configuration
TOP VIEW
POINTER
REGISTER
CONFIGURATION
REGISTER
T
SET
HYST
POINT REGISTER
+
SDA
SCL
OS
1
2
3
4
8
7
6
5
+V
A0
A1
A2
S
8
16
8
16
16
LM75
7
6
5
1
2
A0
A1
A2
SDA
SCL
2-WIRE INTERFACE
4
GND
μMAX (μSOP), SO
Ordering Information/Selector Guide
PART
LM75BIM-3+
PIN-PACKAGE
8 SO (SOP)
PKG
Bulk
T&R
Bulk
T&R
Bulk
T&R
Bulk
T&R
SUPPLY VOLTAGE (V)
TOP MARK
LM75BIM-3
LM75BIM-3
T01B
3.3
3.3
3.3
3.3
5.0
5.0
5.0
LM75BIMX-3+
LM75BIMM-3+
LM75BIMMX-3+
LM75BIM-5+
8 SO (SOP)
8 µMAX (µSOP)
8 µMAX (µSOP)
8 SO (SOP)
T01B
LM75BIM-5
LM75BIM-5
T00B
LM75BIMX-5+
LM75BIMM-5+
LM75BIMMX-5+
8 SO (SOP)
8 µMAX (µSOP)
8 µMAX (µSOP)
5.0
2
T00B
Note: Devices are specified over the -55°C to +125°C temperature range and include I C noise filter.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.