PCT2075: I²C-bus Fm+, 1 degree C accuracy, digital temperature sensor and thermal watchdog

The PCT2075 is a temperature-to-digital converter featuring ±1 °C accuracy over ‑25 °C to +100 °C range. It uses an on-chip band gap temperature sensor and Sigma-Delta A‑to‑D conversion technique with an overtemperature detection output that is a drop-in replacement for other LM75 series thermal sensors. The device 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, set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and hysteresis limits, and programmable temperature sensor sampling time Tidle, that can be communicated by a controller via the 2-wire serial I²C-bus Fast-mode Plus interface.

The PCT2075 also includes an open-drain output (OS) which becomes active when the temperature exceeds the programmed limits. 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 PCT2075 can be configured for different operation conditions. It can be set in normal mode to periodically monitor the ambient temperature, or in shut-down mode to minimize power consumption.

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 device 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 device 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. It is also possible to read just one of the temperature register bytes without lock-up.

The PCT2075 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. The default set points can be modified during manufacture and ordered under custom part number.

There are three selectable logic address pins with three logic states so that 27 8-pin devices or three 6-pin devices can be connected on the same bus without address conflict.

sot1069-2_3d
Data Sheets (1)
Name/DescriptionModified Date
I2C-bus Fm+, 1 degree C accuracy, digital temperature sensor and thermal watchdog (REV 9.0) PDF (1.6 MB) PCT207524 Oct 2014
Selector Guides (1)
Name/DescriptionModified Date
Application guide: Flat-panel TV sets (REV 2.1) PDF (3.2 MB) 7501708513 Mar 2012
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 surface-mounted package (TSOP6); 6 leads (REV 1.0) PDF (255.0 kB) SOT1353-108 Feb 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
Packing (3)
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
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
Ordering Information
ProductStatusPackage versionPackage name
PCT2075DPActiveSOT505-1TSSOP8
PCT2075TPActiveSOT1069-2HWSON8
PCT2075GVActiveSOT1353-1TSOP6
PCT2075DActiveSOT96-1SO8
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateEFRIFR(FIT)MTBF(hour)MSLMSL LF
PCT2075DSOT96-1SO-SOJ-REFLOW SO-SOJ-WAVE
SO-SOJ-REFLOW SO-SOJ-WAVE
Reel 13" Q1/T1ActivePCT2075D,118 (9352 968 98118)Standard MarkingPCT2075DAlways Pb-free0.04.02.5E811
PCT2075TPSOT1069-2Reel 7" Q2/T3ActivePCT2075TP,147 (9352 969 01147)Standard MarkingPCT2075TPAlways Pb-free0.04.02.5E811
PCT2075DPSOT505-1Reflow_Soldering_ProfileReel 13" Q1/T1ActivePCT2075DP,118 (9352 968 99118)Standard MarkingPCT2075DPAlways Pb-free0.04.02.5E811
PCT2075GVSOT1353-1Reel 7" Q1/T1ActivePCT2075GVX (9353 002 78115)Standard MarkingPCT2075GVAlways Pb-free11
Reel 13" Q1/T1ActivePCT2075GVJ (9353 002 78118)Standard MarkingPCT2075GVAlways Pb-free11
I2C-bus Fm+, 1 degree C accuracy, digital temperature sensor and thermal watchdog PCT2075TP
Application guide: Flat-panel TV sets mmbz33vcl
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
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
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
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 surface-mounted package (TSOP6); 6 leads PCT2075GV
SA612A
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