19-4385; Rev 0; 3/09
Digital Temperature Sensor and Thermal
Watchdog with 2-Wire Interface
General Description
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
I
2
C interface to read temperature at any time. The
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
at which the alarm is asserted (T
OS
) and the hysteresis
temperature below which the alarm condition is not
valid (T
HYST
). Also, the LM75’s T
OS
and T
HYST
regis-
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
defaults of T
OS
= +80°C and T
HYST
= +75°C. The 3.0V
to 5.5V supply voltage range, low supply current, and
I
2
C interface make the LM75 ideal for many applica-
tions in thermal management and protection.
o
o
o
o
o
o
o
o
o
o
Features
SO (SOP) and µMAX
®
(µSOP) Packages
I
2
C Bus Interface
Separate Open-Drain OS Output Operates as
Interrupt or Comparator/Thermostat Input
Register Readback Capability
Power-Up Defaults Permit Stand-Alone Operation
as a Thermostat
3.0V to 5.5V Supply Voltage
Low Operating Supply Current 250µA (typ), 1mA
(max)
4µA (typ) Shutdown Mode Minimizes Power
Consumption
Up to Eight LM75s Can Be Connected to a Single
Bus
Pin- and/or Register-Compatible with Improved-
Performance Maxim Sensors Including MAX7500,
MAX6625, MAX6626, DS75LV, and DS7505
LM75
Applications
Thermal System Management
Thermal Protection
Test Equipment
Computers and Office Electronics
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Functional Diagram
+V
S
= 3.0V to 5.5V
8
3
SILICON
BANDGAP
TEMPERATURE
SENSOR
16
9-BIT DELTA-
SIGMA ADC
16
SET POINT
COMPARATOR W/
HYSTERESIS
OS
Pin Configuration
TOP VIEW
SDA
SCL
OS
GND
1
2
3
4
TOS SET POINT
REGISTER
+
LM75
CONFIGURATION
REGISTER
POINTER
REGISTER
16
8
16
T
HYST
SET
POINT REGISTER
16
1
8
7
6
5
+V
S
A0
A1
A2
7
A0
6
A1
5
A2
8
2-WIRE INTERFACE
2
4
SDA
SCL
μMAX
(μSOP), SO
Ordering Information/Selector Guide
PART
LM75BIM-3+
LM75BIMX-3+
LM75BIMM-3+
LM75BIMMX-3+
LM75BIM-5+
LM75BIMX-5+
LM75BIMM-5+
LM75BIMMX-5+
PIN-PACKAGE
8 SO (SOP)
8 SO (SOP)
8 µMAX (µSOP)
8 µMAX (µSOP)
8 SO (SOP)
8 SO (SOP)
8 µMAX (µSOP)
8 µMAX (µSOP)
PKG
Bulk
T&R
Bulk
T&R
Bulk
T&R
Bulk
T&R
SUPPLY VOLTAGE (V)
3.3
3.3
3.3
3.3
5.0
5.0
5.0
5.0
TOP MARK
LM75BIM-3
LM75BIM-3
T01B
T01B
LM75BIM-5
LM75BIM-5
T00B
T00B
Note:
Devices are specified over the -55°C to +125°C temperature range and include I
2
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
