Window Comparator. LM76 Datasheet

LM76 Comparator. Datasheet pdf. Equivalent

LM76 Datasheet
Recommendation LM76 Datasheet
Part LM76
Description 12-Bit + Sign Digital Temperature Sensor and Thermal Window Comparator
Feature LM76; LM76 www.ti.com SNIS109E – JANUARY 2000 – REVISED MARCH 2013 LM76 ±0.5°C, ±1°C, 12-Bit + Sign Dig.
Manufacture etcTI
Datasheet
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etcTI LM76
LM76
www.ti.com
SNIS109E – JANUARY 2000 – REVISED MARCH 2013
LM76 ±0.5°C, ±1°C, 12-Bit + Sign Digital Temperature Sensor and Thermal Window
Comparator with Two-Wire Interface
Check for Samples: LM76
FEATURES
1
2 Window Comparison Simplifies Design of
ACPI Compatible Temperature Monitoring and
Control.
• Serial Bus Interface
• Separate Open-Drain Outputs for Interrupt and
Critical Temperature Shutdown
• Shutdown Mode to Minimize Power
Consumption
• Up to 4 LM76s can be Connected to a Single
Bus
• 12-bit + Sign Output; Full-scale Reading of
Over 127°C
KEY SPECIFICATIONS
• Supply Voltage 5.0V
• Supply Current
– Operating
– 250 µA (typ)
– 450 µA (max)
– Shutdown
– 8 µA (max)
• Temperature +25ºC ±0.5ºC (max)
– Accuracy
– –10ºC to +45ºC ±10°C (max)
– 70°C to 100°C ±1.0°C (max)
• Resolution 0.0625°C
APPLICATIONS
• System Thermal Management
• Personal Computers
• Office Electronics
• HVAC
DESCRIPTION
The LM76 is a digital temperature sensor and thermal
window comparator with an I2C Serial Bus interface
with an accuracy of ±1°C. This accuracy for the
LM76CHM is specified for a 10°C to 45°C
temperature range. The LM76CHM is specified with
an accuracy ±0.5°C at 25°C. The window-comparator
architecture of the LM76 eases the design of
temperature control systems conforming to the ACPI
(Advanced Configuration and Power Interface)
specification for personal computers. The open-drain
Interrupt (INT) output becomes active whenever
temperature goes outside a programmable window,
while a separate Critical Temperature Alarm
(T_CRIT_A) output becomes active when the
temperature exceeds a programmable critical limit.
The INT output can operate in either a comparator or
event mode, while the T_CRIT_A output operates in
comparator mode only.
The host can program both the upper and lower limits
of the window as well as the critical temperature limit.
Programmable hysterisis as well as a fault queue are
available to minimize false tripping. Two pins (A0, A1)
are available for address selection. The sensor
powers up with default thresholds of 2°C THYST, 10°C
TLOW, 64°C THIGH, and 80°C T_CRIT.
The LM76's 5.0V supply voltage, Serial Bus interface,
12-bit + sign output, and full-scale range of over
127°C make it ideal for a wide range of applications.
These include thermal management and protection
applications in personal computers, electronic test
equipment, office electronics and bio-medical
applications.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated



etcTI LM76
LM76
SNIS109E – JANUARY 2000 – REVISED MARCH 2013
Simplified Block Diagram
www.ti.com
Connection Diagram
Figure 1. SOIC-8
LM76 See Package Number D
Label
SDA
SCL
T_CRIT_A
GND
INT
A0–A1
+VS
Pin #
1
2
3
4
5
7, 6
8
PIN DESCRIPTIONS
Function
Serial Bi-Directional Data Line, Open Drain Output, CMOS
Logic Level
Serial Bus Clock Input, CMOS Logic Level
Critical Temperature Alarm, Open Drain Output
Power Supply Ground
Interrupt, Open Drain Output
User-Set Address Inputs, TTL Logic Level
Positive Supply Voltage Input
Typical Connection
Pull Up Resistor, Controller I2C Data Line
From Controller I2C Clock Line
Pull Up Resistor, Controller Interrupt Line or
System Hardware Shutdown
Ground
Pull Up Resistor, Controller Interrupt Line
Ground (Low, “0”) or +VS (High, “1”)
DC Voltage from 3.3V power supply or 5V.
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Figure 2. Typical Application
Product Folder Links: LM76
Copyright © 2000–2013, Texas Instruments Incorporated



etcTI LM76
LM76
www.ti.com
SNIS109E – JANUARY 2000 – REVISED MARCH 2013
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings(1)
Supply Voltage
Voltage at any Pin
Input Current at any Pin
Package Input Current(2)
T_CRIT_A and
INT Output Sink Current
T_CRIT_A and
INT Output Voltage
Storage Temperature
Soldering Information, Lead Temperature
SOIC Package(3)
ESD Susceptibility (4)
Vapor Phase (60 seconds)
Infrared (15 seconds)
Human Body Model
Machine Model
0.3V to 6.5V
0.3V to (+VS + 0.3V)
5mA
20mA
10mA
6.5V
65°C to +125°C
215°C
220°C
3000V
250V
(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 5
mA. The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input
current of 5 mA to four.
(3) See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current
Texas Instruments Linear Data Book for other methods of soldering surface mount devices.
(4) Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.
Operating Ratings(1)(2)
Operating Temperature Range
Specified Temperature Range(3)
LM76CHM-5
Supply Voltage Range (+VS)(4)
55°C to +150°C
TMIN to TMAX
20°C to +85°C
+4.5V to +5.5V
(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) LM76 θJA (thermal resistance, junction-to-ambient) when attached to a printed circuit board with 2 oz. foil is 200°C/W.
(3) While the LM76 has a full-scale-range in excess of 128°C, prolonged operation at temperatures above 125°C is not recommended.
(4) The LM76 will operate properly over the +VS supply voltage range of 3V to 5.5V for the LM76CNM-3 and the LM76CHM-5. The
LM76CNM-3 is tested and specified for rated accuracy at the nominal supply voltage of 3.3V. Accuracy of the LM76CNM-3 will degrade
0.2°C for a ±1% variation in +VS from the nominal value. The LM76CHM-5 is tested and specified for a rated accuracy at the nominal
supply voltage of 5.0V. Accuracy of the LM76CHM-5 will degrade 0.08°C for a ±1% variation in +VS from the nominal value.
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM76
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