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reference designNCT72 | Demoboard ONSEC-19-003

Onsemi NCT72 | Demoboard ONSEC-19-003

±1°C Temperature Monitor with Series Resistance Cancellation

Overview

TopologyOther Topology
IC revision1.0

Description

The NCT72 is a dual-channel digital thermometer and undertemperature/overtemperature alarm, intended for use in PCs and thermal management systems. It is pin and register compatible with the NCT1008 but the NCT72 allows the user to pull the /ALERT pin to 1.8V without increasin the device Idd. A feature of the NCT72 is series resistance cancellation, where up to 1.5 kΩ (typical) of resistance in series with the temperature monitoring diode can be automatically cancelled from the temperature result, allowing noise filtering. The NCT72 has a configurable /ALERT output and an extended, switchable temperature measurement range. The NCT72 can measure the temperature of a remote thermal diode accurate to ±1°C and the ambient temperature accurate to ±3°C. The temperature measurement range defaults to 0°C to +127°C, compatible with the NCT1008, but it can be switched to a wider measurement range of -64°C to +191°C. The NCT72 communicates over a 2-wire serial interface, compatible with system management bus (SMBus/I2C) standards. The default SMBus/I2C address of the NCT72 is 0x4C. An NCT72D is available with an SMBus/I2C address of 0x4D. This is useful if more than one NCT72 is used on the same SMBus/I2C. An /ALERT output signals when the on-chip or remote temperature is out of range. The /THERM output is a comparator output that allows on/off control of a cooling fan. The /ALERT output can be reconfigured as a second /THERM output, if required.

Features

  • On-Chip and Remote Temperature Sensor
  • 0.25°C Resolution/1°C Accuracy on Remote Channel
  • 1°C Resolution/1°C Accuracy on Local Channel
  • Series Resistance Cancellation up to 1.5 kΩ
  • Extended, Switchable Temperature Measurement Range 0°C to +127°C (Default) or -64°C to +191°C
  • Pin and Register Compatible with NCT1008
  • Remote /THERM limit of 108°C
  • 2-Wire SMBus/I2C Serial Interface with SMBus Alert Support
  • Programmable Over/Undertemperature Limits
  • Offset Registers for System Calibration
  • Up to Two Overtemperature Fail-Safe /THERM Outputs
  • 240 µA Operating Current, 5 µA Standby Current
  • Compatible with 1.8 V Logic

Typical applications

  • Smart Phones, Desktop and Notebook Computers
  • Embedded systems
  • Smart Batteries
  • Automotive

More information

Products

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SamplesAvailability & Sample
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150060RS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, 1.6 mm, –
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Availability
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Downloads27 files

RAY files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear
Length1.6 mm
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Dominant Wavelength [typ.]625 nm
Emitting ColorRed 
Peak Wavelength [typ.]630 nm
Luminous Intensity [typ.]250 mcd
Forward Voltage [typ.]2 V
Chip TechnologyAlInGaP 
Viewing Angle Phi 0° [typ.]140 °
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MountSMT 
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PackagingTape and Reel 
Operating Temperature -40 °C up to +85 °C
Height0.7 mm
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150060YS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, 1.6 mm, –
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Availability
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Downloads27 files

RAY files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear
Length1.6 mm
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Dominant Wavelength [typ.]590 nm
Emitting ColorYellow 
Peak Wavelength [typ.]595 nm
Luminous Intensity [typ.]120 mcd
Forward Voltage [typ.]2 V
Chip TechnologyAlInGaP 
Viewing Angle Phi 0° [typ.]140 °
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MountSMT 
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PackagingTape and Reel 
Operating Temperature -40 °C up to +85 °C
Height0.7 mm
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150060GS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, 1.6 mm, –
Simu­lation
Availability
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Downloads27 files

RAY files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear
Length1.6 mm
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Dominant Wavelength [typ.]525 nm
Emitting ColorGreen 
Peak Wavelength [typ.]515 nm
Luminous Intensity [typ.]430 mcd
Forward Voltage [typ.]3.2 V
Chip TechnologyInGaN 
Viewing Angle Phi 0° [typ.]140 °
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MountSMT 
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PackagingTape and Reel 
Operating Temperature -40 °C up to +85 °C
Height0.7 mm
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–Check availability
150060BS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, 1.6 mm, –
Simu­lation
Availability
–
Downloads28 files

RAY files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear
Length1.6 mm
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Dominant Wavelength [typ.]470 nm
Emitting ColorBlue 
Peak Wavelength [typ.]465 nm
Luminous Intensity [typ.]145 mcd
Forward Voltage [typ.]3.2 V
Chip TechnologyInGaN 
Viewing Angle Phi 0° [typ.]140 °
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MountSMT 
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PackagingTape and Reel 
Operating Temperature -40 °C up to +85 °C
Height0.7 mm
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–Check availability
61300211121
SPECWR-PHD Pin Header - Single, 5.08 mm, –
Simu­lation–
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header - Single
Length5.08 mm
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TypeStraight 
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GenderPin Header 
Pins2 
MountTHT 
Rated Current3 A
Working Voltage250 V (AC)
PackagingBag 
Operating Temperature -40 °C up to +105 °C
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61300311121
SPECWR-PHD Pin Header - Single, 7.62 mm, –
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header - Single
Length7.62 mm
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TypeStraight 
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GenderPin Header 
Pins3 
MountTHT 
Rated Current3 A
Working Voltage250 V (AC)
PackagingBag 
Operating Temperature -40 °C up to +105 °C
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971100365
SPECWA-SPAIE Plastic Spacer Stud, metric, internal/ external, 10 mm, M3
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Downloads3 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWA-SPAIE Plastic Spacer Stud, metric, internal/ external
Length10 mm
Outer ThreadM3 
Inner ThreadM3 
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SW6 mm
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PackagingBag 
Operating Temperature -30 °C up to +110 °C
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434153017835
SPECWS-TASV J-Bend SMT Tact Switch 3.5x2.9 mm, –, –
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Downloads6 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWS-TASV J-Bend SMT Tact Switch 3.5x2.9 mm
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Rated Current0.05 A
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PackagingTape and Reel 
Operating Temperature -40 °C up to +85 °C
Height1.7 mm
Operation Force350 g
Electrical Life200000 Cycles
Actuator ColorBlue 
WashableNo 
Vaporphase processnot specified 
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65100516121
SPECWR-USB Mini/Micro Connectors, –, –
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-USB Mini/Micro Connectors
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ApplicationMini USB 2.0 
Interface TypeType B 
TypeHorizontal 
Variantwith Pads & Pegs 
GenderReceptacle 
Pins5 
MountSMT 
Rated Current1 A
Working Voltage30 V (AC)
PackagingTape and Reel & Mylar 
Operating Temperature -40 °C up to +105 °C
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709940300
SPECWA-SNTE Snap-In Stop Spacer for Printed Circuit Boards, –, –
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Downloads3 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWA-SNTE Snap-In Stop Spacer for Printed Circuit Boards
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Inner ThreadM3 
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SW5.5 mm
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PackagingBag 
Operating Temperature -30 °C up to +85 °C
Height2.4 mm
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