LM75B: Digital temperature sensor and thermal watchdog

The LM75B is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma-Delta A-to-D conversion technique with an overtemperature detection output. The LM75B 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; 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 LM75B 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 two’s complement data giving a temperature resolution of 0.125 °C. This high temperature resolution is particularly useful in applications of measuring precisely the thermal drift or runaway. When the LM75B is accessed the conversion in process is not interrupted (that is, the I²C-bus section is totally independent of the Sigma-Delta converter section) and accessing the LM75B continuously without waiting at least one conversion time between communications will not prevent the device from updating the Temp register with a new conversion result. The new conversion result will be available immediately after the Temp register is updated.

The LM75B powers up in the normal operation mode with the OS in comparator mode, temperature threshold of 80 °C and hysteresis of 75 °C, so that it can be used as a stand-alone thermostat with those pre-defined temperature set points.

LM75B: Product Block Diagram
sot1069-2_3d
Data Sheets (1)
Name/DescriptionModified Date
Digital temperature sensor and thermal watchdog (REV 6.1) PDF (527.0 kB) LM75B06 Feb 2015
Application Notes (3)
Name/DescriptionModified Date
MicroPak soldering information (REV 2.0) PDF (245.0 kB) AN1034330 Dec 2010
Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN1044120 Jun 2007
I2C manual (REV 1.0) PDF (4.2 MB) AN1021627 Mar 2003
Users Guides (3)
Name/DescriptionModified Date
I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM1020428 Apr 2014
I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA03 Apr 2013
I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM1020613 Jun 2006
Brochures (2)
Name/DescriptionModified Date
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 7501754001 Aug 2014
Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for... (REV 1.0) PDF (1.1 MB) 7501654301 Jun 2008
Package Information (4)
Name/DescriptionModified Date
HWSON8: plastic thermal enhanced very very thin small outline package, no leads; 8 terminals; (REV 1.1) PDF (190.0 kB) SOT1069-210 Jun 2016
plastic thin shrink small outline package; 8 leads; body width 3 mm (REV 1.0) PDF (240.0 kB) SOT505-108 Feb 2016
plastic small outline package; 8 leads; body width 3.9 mm (REV 1.0) PDF (244.0 kB) SOT96-108 Feb 2016
plastic extremely thin small outline package; no leads; 8 terminals; body 3 x 2 x 0.5 mm (REV 1.0) PDF (190.0 kB) SOT996-208 Feb 2016
Packing (4)
Name/DescriptionModified Date
HWSON8; Reel pack, SMD, 7" Q2/T3 Turned 90 degree product orientation Orderable part number ending, 147 or... (REV 1.0) PDF (196.0 kB) SOT1069-2_14706 May 2014
XSON8(U); Reel pack, Reverse; SMD, 7" Q3/T4 Standard product orientation Orderable part number ending ,125 or... (REV 5.0) PDF (200.0 kB) SOT996-2_12502 May 2013
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 2.0) PDF (232.0 kB) SOT96-1_11819 Apr 2013
TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (214.0 kB) SOT505-1_11815 Apr 2013
Supporting Information (4)
Name/DescriptionModified Date
Reflow Soldering Profile (REV 1.0) PDF (34.0 kB) REFLOW_SOLDERING_PROFILE30 Sep 2013
Wave Soldering Profile (REV 1.0) PDF (20.0 kB) WAVE_SOLDERING_PROFILE30 Sep 2013
Footprint for reflow soldering (REV 1.0) PDF (9.0 kB) SO-SOJ-REFLOW08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (8.0 kB) SO-SOJ-WAVE08 Oct 2009
IBIS Model
Ordering Information
ProductStatusPackage version
LM75BTPActiveSOT1069-2
LM75BDActiveSOT96-1
LM75BGDActiveSOT996-2
LM75BDPActiveSOT505-1
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateEFRIFR(FIT)MTBF(hour)MSLMSL LF
LM75BDPSOT505-1Reflow_Soldering_ProfileReel 13" Q1/T1ActiveLM75BDP,118 (9352 858 36118)LM75BLM75BDPAlways Pb-free0.02.05E811
LM75BDP/DGSOT505-1Reflow_Soldering_ProfileReel 13" Q1/T1ActiveLM75BDP/DG,118 (9352 933 85118)LM75BLM75BDP/DGAlways Pb-free0.02.05E811
LM75BDSOT96-1SO-SOJ-REFLOW SO-SOJ-WAVE
SO-SOJ-REFLOW SO-SOJ-WAVE
Reel 13" Q1/T1ActiveLM75BD,118 (9352 858 37118)LM75BDLM75BDAlways Pb-free0.02.05E811
Bulk PackActiveLM75BD,112 (9352 858 37112)LM75BDLM75BDAlways Pb-free0.02.05E811
LM75BGDSOT996-2Reel 7" Q3/T4, ReverseActiveLM75BGD,125 (9352 882 39125)75BLM75BGDAlways Pb-free0.02.05E811
LM75BTPSOT1069-2Reel 7" Q2/T3ActiveLM75BTP,147 (9352 965 01147)M75LM75BTPAlways Pb-free0.02.05E811
Digital temperature sensor and thermal watchdog lm75b
MicroPak soldering information NTS0102_Q100
Level shifting techniques in I2C-bus design pca9685pw
I2C manual se98apw
I2C-bus specification and user manual pca9685pw
I2C-bus specification and user manual pca9685pw
I2C Demonstration Board 2005-1 Quick Start Guide pca9685pw
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns pca9685pw
Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for... PMEG6010CE_AUTOMOTIVE
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
LM75B IBIS model LM75BDP
LM75BDP IBIS model LM75BDP
plastic thin shrink small outline package; 8 leads; body width 3 mm pesd5v0l7bas
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... pesd5v0l7bas
plastic small outline package; 8 leads; body width 3.9 mm CBT3306_Q100
Footprint for reflow soldering NPIC6C596A_Q100
Footprint for wave soldering NPIC6C596A_Q100
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... CBT3306_Q100
plastic extremely thin small outline package; no leads; 8 terminals; body 3 x 2 x 0.5 mm 74AHC_T_3G14_Q100
XSON8(U); Reel pack, Reverse; SMD, 7" Q3/T4 Standard product orientation Orderable part number ending ,125 or... 74AHC_T_3G14_Q100
HWSON8: plastic thermal enhanced very very thin small outline package, no leads; 8 terminals; PCT2075TP
HWSON8; Reel pack, SMD, 7" Q2/T3 Turned 90 degree product orientation Orderable part number ending, 147 or... PCT2075TP
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