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Datasheet

(Product Specification)
v.4, 10-Jul-07, 24 pages, 137 kB

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Digital temperature sensor and thermal watchdog

General description
Features
Products/packages
Quality/reliability/chemical content
Pricing/ordering/availability
Samples
Discontinued information
Applications
Block diagrams/pinning
Design support
Parametrics/similar products
Print/email
Disclaimers
All information hereunder is subject to the subsequent disclaimers

General description

The LM75A is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma-delta A-to-D conversion technique. The device is also a thermal detector providing an overtemperature detection output. The LM75A contains a number of data registers: Configuration register (Conf) to store the device settings such as device operation mode, OS operation mode, OS polarity and OS fault queue as described in Section 7 "Functional description"; temperature register (Temp) to store the digital temp reading, and set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and hysteresis limits, that can be communicated by a controller via the 2-wire serial I2C-bus interface. The device also includes an open-drain output (OS) which becomes active when the temperature exceeds the programmed limits. There are three selectable logic address pins so that eight devices can be connected on the same bus without address conflict.

The LM75A can be configured for different operation conditions. It can be set in normal mode to periodically monitor the ambient temperature, or in shutdown mode to minimize power consumption. The OS output operates in either of two selectable modes: OS comparator mode or OS interrupt mode. Its active state can be selected as either HIGH or LOW. The fault queue that defines the number of consecutive faults in order to activate the OS output is programmable as well as the set-point limits.

The temperature register always stores an 11-bit 2's complement data giving a temperature resolution of 0.125 Cel. This high temperature resolution is particularly useful in applications of measuring precisely the thermal drift or runaway.

The device is powered-up in normal operation mode with the OS in comparator mode, temperature threshold of 80 Cel and hysteresis of 75 Cel, so that it can be used as a stand-alone thermostat with those pre-defined temperature set points.

Features

  • Pin-for-pin replacement for industry standard LM75 and offers improved temperature resolution of 0.125 Cel and specification of a single part over power supply range from 2.8 V to 5.5 V
  • Small 8-pin package types: SO8 and TSSOP8
  • I2C-bus interface with up to 8 devices on the same bus
  • Power supply range from 2.8 V to 5.5 V
  • Temperatures range from -55 Cel to +125 Cel
  • 11-bit ADC that offers a temperature resolution of 0.125 Cel
  • Temperature accuracy of:
    • +-2 Cel from -25 Cel to +100 Cel
    • +-3 Cel from -55 Cel to +125 Cel
  • Programmable temperature threshold and hysteresis set points
  • Supply current of 3.5 uA in shutdown mode for power conservation
  • Stand-alone operation as thermostat at power-up
  • ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Products/packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
LM75ADLM75AD,1129352 697 75112Volume productionSOT96TubeStandard Marking
LM75ADLM75AD,1189352 697 75118Volume productionSOT96Reel Pack, SMD, 13"Standard Marking
LM75AD/01LM75AD/01,1129352 769 01112DevelopmentSOT96TubeStandard Marking
LM75AD/01LM75AD/01,1189352 769 01118DevelopmentSOT96Reel Pack, SMD, 13"Standard Marking
LM75AD/DGLM75AD/DG,1189352 886 96118Volume productionSOT96Reel Pack, SMD, 13"Standard Marking
LM75AD/GLM75AD/G,1189352 785 31118Volume productionSOT96Reel Pack, SMD, 13"Standard Marking
LM75ADPLM75ADP,1189352 697 76118Volume productionSOT505-1
(TSSOP8)
Reel Pack, SMD, 13"Standard Marking
LM75ADP/01LM75ADP/01,1189352 769 06118DevelopmentSOT505-1
(TSSOP8)
Reel Pack, SMD, 13"Standard Marking
LM75ADP/DGLM75ADP/DG,1189352 886 14118DevelopmentSOT505-1
(TSSOP8)
Reel Pack, SMD, 13"Standard Marking

Quality/reliability/chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree Conversion dateRHFIRF (FIT)MTBF (hours)MSL Lead-free
LM75ADLM75AD,112LM75AD
week 17, 2005
LM75ADLM75AD,118LM75AD
week 17, 2005
LM75AD/01LM75AD/01,112LM75AD_01
LM75AD/01LM75AD/01,118LM75AD_01
LM75AD/DGLM75AD/DG,118LM75AD_DG
Always Pb-free
LM75AD/GLM75AD/G,118LM75AD_G
Always Pb-free
LM75ADPLM75ADP,118LM75ADP
week 13, 2005
LM75ADP/01LM75ADP/01,118LM75ADP_01
week 19, 2005
LM75ADP/DGLM75ADP/DG,118LM75ADP_DG
Always Pb-free

Quality and reliability disclaimer

Pricing/ordering/availability

Type numberOrdering code(12NC)Orderable part numberIndicative price/unit($)RegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
LM75AD9352 697 75112  LM75AD,112  0.4600NAARROW ELECTRONICS118 3/18/2010Buy onlinenot available
    NAFUTURE ELECTRONICS1,235 3/17/2010Buy online 
    NAAVNET ELECTRONICS MARKETING1,923 3/18/2010Buy online 
    JAPANCHIP ONE STOPyes 03/19/2010Buy online 
LM75AD9352 697 75118  LM75AD,118  0.4600NAARROW ELECTRONICS118 3/18/2010Buy onlineOrder samples
    ASIASAC - Taiwanyes250003/19/2010Buy online 
    JAPANCHIP ONE STOPno 03/19/2010Buy online 
LM75AD/019352 769 01112  LM75AD/01,112        not available
LM75AD/019352 769 01118  LM75AD/01,118        not available
LM75AD/DG9352 886 96118  LM75AD/DG,118        Order samples
LM75AD/G9352 785 31118  LM75AD/G,118  JAPANCHIP ONE STOPno 03/19/2010Buy onlineOrder samples
LM75ADP9352 697 76118  LM75ADP,118  0.5900NAARROW ELECTRONICS118 3/18/2010Buy onlineOrder samples
    NADIGI-KEY CORPORATION22,152 3/18/2010Buy online 
    JAPANCHIP ONE STOPyes 03/19/2010Buy online 
LM75ADP/019352 769 06118  LM75ADP/01,118        not available
LM75ADP/DG9352 886 14118  LM75ADP/DG,118        not available

Applications

  • System thermal management
  • Personal computers
  • Electronics equipment
  • Industrial controllers


Related applications
Intelligent washing machine
Transceiver board
Power amplifier board
Main CPU board
LCD TV - MMS functionality

Block diagrams/pinning

Parametrics/similar products

Type numberPackageREMARKSStandby
current(uA)
Operating
temp.(Cel)
I²C-bus
controlled
Part typeAccuracy on-chip( ±°C)Assignable AddressesInternal Temperature MonitorOver Temperature AlertRemote Temperature MonitorSMBus Clock (max)(kHz)Under Temperature AlertOperating voltage(VDC)
LM75ADSOT96
Extended temperature range, temperature to digital converter, programmable threshold.0035-55~125yesSupervisor, Temperature2@-25~100
2@+60~100
8yesyesno400.0no2.8~5.5
LM75AD/01SOT96
Extended temperature range, temperature to digital converter, programmable threshold.0035-55~125yesSupervisor, Temperature2@-25~100
2@+60~100
8yesyesno400.0no2.8~5.5
LM75AD/DGSOT96
Extended temperature range, temperature to digital converter, programmable threshold.0035-55~125yesSupervisor, Temperature2@-25~100
2@+60~100
8yesyesno400.0no2.8~5.5
LM75AD/GSOT96
Extended temperature range, temperature to digital converter, programmable threshold.0035-55~125yesSupervisor, Temperature2@-25~100
2@+60~100
8yesyesno400.0no2.8~5.5
LM75ADPSOT505-1
(TSSOP8)
.0035-55~1252@-25~100
2@+60~100
8yesno400.0no2.8~5.5
LM75ADP/01SOT505-1
(TSSOP8)
.0035-55~1252@-25~100
2@+60~100
8yesno400.0no2.8~5.5
LM75ADP/DGSOT505-1
(TSSOP8)
.0035-55~1252@-25~100
2@+60~100
8yesno400.0no2.8~5.5


Similar products
LM75A links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.