Thermal Watchdog. LM75A Datasheet

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LM75A
SNOS808P – JANUARY 2000 – REVISED DECEMBER 2014
LM75A Digital Temperature Sensor and Thermal Watchdog With Two-Wire Interface
1 Features
1 No External Components Required
• Shutdown Mode to Minimize Power Consumption
• Up to Eight LM75As can be Connected to a Single
Bus
• Power up Defaults Permit Stand-Alone Operation
as Thermostat
• Key Specifications:
– Supply Voltage
– LM75A: 2.7 V to 5.5 V
– Supply Current
– Operating: 280 μA (Typical)
– Shutdown: 4 μA (Typical)
– Temperature Accuracy
– 25°C to 100°C: ±2°C (Max)
– 55°C to 125°C: ±3°C (Max)
2 Applications
• General System Thermal Management
• Communications Infrastructure
• Electronic Test Equipment
• Environmental Monitoring
3 Description
The LM75A is an industry-standard digital
temperature sensor with an integrated sigma-delta
analog-to-digital converter (ADC) and I2C interface.
The LM75A provides 9-bit digital temperature
readings with an accuracy of ±2°C from –25°C to
100°C and ±3°C over –55°C to 125°C.
The LM75A operates with a single supply from 2.7 V
to 5.5 V. Communication is accomplished over a
2-wire interface which operates up to 400 kHz. The
LM75A has three address pins, allowing up to eight
LM75A devices to operate on the same 2-wire bus.
The LM75A has a dedicated overtemperature output
(O.S.) with programmable limit and hysteresis. This
output has programmable fault tolerance, which lets
the user to define the number of consecutive error
conditions that must occur before O.S. is activated.
The wide temperature and supply range and I2C
interface make the LM75A ideal for a number of
applications including base stations, electronic test
equipment, office electronics, personal computers,
and any other system in which thermal management
is critical to performance. The LM75A is available in
an SOIC-8 package and an VSSOP-8 package.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM75A
SOIC (8)
VSSOP (8)
4.90 mm × 3.91 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application
+VS 100 nF (typ) unless mounted
close to processor
A0
Address
(Set as desired)
A1
A2
7
6
5
8
LM75
SDA
Interface
SCL
1
2
4
GND
3
O.S.
To Processor
Interrupt Line
O.S. set to active low
IRUZLUH25¶GPXOWLSOH
interrupt line
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


LM75A Datasheet
Recommendation LM75A Datasheet
Part LM75A
Description Digital Temperature Sensor and Thermal Watchdog
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LM75A
SNOS808P – JANUARY 2000 – REVISED DECEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3
6.2 ESD Ratings.............................................................. 3
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Temperature-to-Digital Converter Characteristics..... 4
6.6 Digital DC Characteristics ......................................... 5
6.7 I2C Digital Switching Characteristics......................... 5
6.8 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 10
7.5 Programming........................................................... 11
7.6 Register Maps ......................................................... 13
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Applications ................................................ 15
8.3 System Examples ................................................... 16
9 Power Supply Recommendations...................... 18
10 Layout................................................................... 18
10.1 Layout Guidelines ................................................. 18
10.2 Layout Example .................................................... 19
11 Device and Documentation Support ................. 20
11.1 Trademarks ........................................................... 20
11.2 Electrostatic Discharge Caution ............................ 20
11.3 Glossary ................................................................ 20
12 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision O (May 2013) to Revision P
Page
• Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1
Changes from Revision N (May 2013) to Revision O
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 16
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5 Pin Configuration and Functions
LM75A
SNOS808P – JANUARY 2000 – REVISED DECEMBER 2014
8-Pins
SOIC (D) and VSSOP (DGK) Packages
Top View
Pin Functions
PIN
NO. NAME
1 SDA
2 SCL
DESCRIPTION
I2C Serial Bi-Directional Data Line, Open
Drain
I2C Clock Input
TYPICAL CONNECTION
From Controller, tied to a pullup resistor or current source
From Controller, tied to a pullup resistor or current source
3
O.S.
Overtemperature Shutdown, Open Drain
Output
Pull–up Resistor, Controller Interrupt Line
4 GND Power Supply Ground
Ground
5 A2
6 A1 User-Set I2C Address Inputs
7 A0
Ground (Low, “0”) or +VS (High, “1”)
8 +VS Positive Supply Voltage Input
DC Voltage from 2.7 V to 5.5 V 100-nF bypass capacitor with 10-µF bulk
capacitance in the near vicinity
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
Supply Voltage Pin (+VS)
Voltage at A0, A1and A2 Pins
Voltage at OS, SCL and SDA Pins
Input Current at any Pin(2)
Package Input Current(2)
MIN
MAX
UNIT
0.3 6.5
V
0.3
0.3
(+VS + 0.3) and must be 6.5
6.5
V
V
5 mA
20 mA
O.S. Output Sink Current
10 mA
O.S. Output Voltage
6.5 V
Storage temperature, Tstg
–65 150 °C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not
apply when operating the device beyond its rated operating conditions.
(2) When the input voltage (VI) at any pin exceeds the power supplies (VI < GND or VI > +VS) the current at that pin should be limited to
5mA. The 20mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an
input current of 5mA to four.
6.2 ESD Ratings
V(ESD) Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)
Charged-device model (CDM), per JEDEC specification JESD22-
C101 (2)
Machine model
VALUE
±2500
±1000
±250
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
UNIT
V
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