NE1617ADS: Temperature monitor for microprocessor systems

The NE1617A is an accurate two-channel temperature monitor. It measures the temperature of itself and the temperature of a remote sensor. The remote sensor is a diode connected transistor. This can be in the form of either a discrete NPN/PNP, such as the 2N3904/2N3906, or a diode connected PNP built into another die, such as is done on some Intel microprocessors.

The temperature of both the remote and local sensors is stored in a register that can be read via a 2-wire SMBus. The temperatures are updated at a rate that is programmable via the SMBus (the average supply current is dependent upon the update rate — the faster the rate, the higher the current).

In addition to the normal operation, which is to update the temperature at the programmed rate, there is a one-shot mode that will force a temperature update.

There is also an alarm that senses either an overtemperature or undertemperature condition. The trip points for this alarm are also programmable.

The device can have one of nine addresses (determined by two address pins), so there can be up to nine of the NE1617A on the SMBus.

It can also be put in standby mode (in order to save power). This can be done either with software (over the SMBus) or with hardware (using the STBY pin).

sot519-1_3d
Data Sheets (1)
Name/DescriptionModified Date
Temperature monitor for microprocessor systems (REV 5.0) PDF (305.0 kB) NE1617A20 Mar 2012
Application Notes (3)
Name/DescriptionModified Date
Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN1044120 Jun 2007
Digital temperature sensor accuracy explained (REV 1.0) PDF (111.0 kB) AN1034909 Aug 2006
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 (3)
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
Precise thermal monitoring with small, accurate temp sensors; NXP® temperature sensors NE1617A & NE1619 (REV 1.0) PDF (253.0 kB) 7501653301 Aug 2008
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
Selector Guides (1)
Name/DescriptionModified Date
I2C-bus temperature sensors; Small, accurate, low-cost sensors for advanced temperature regulation (REV 1.0) PDF (675.0 kB) 7501569301 Nov 2006
Package Information (1)
Name/DescriptionModified Date
plastic shrink small outline package; 16 leads; body width 3.9 mm; lead pitch 0.635 mm (REV 1.0) PDF (278.0 kB) SOT519-108 Feb 2016
Packing (1)
Name/DescriptionModified Date
SSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code... (REV 1.0) PDF (194.0 kB) SOT519-1_11820 Oct 2015
Supporting Information (2)
Name/DescriptionModified Date
Footprint for reflow soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-REFLOW08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE08 Oct 2009
Ordering Information
ProductStatusPackage versionRemarksStandby current (uA)Operating Temperature (Cel)I2C-bus controlledPart typeAccuracy on-chip (±°C)Operating voltage (VDC)Assignable addressesSMBus clock (kHz)Accuracy remote (±°C)
NE1617ADSActiveSOT519-1100~1203.0~5.51@+60~100?2@0~1253.0~5.591003@+60~100?5@0~125
NE1617ADS/GNo Longer ManufacturedSOT519-1100~1203.0~5.51@+60~100?2@0~1253.0~5.591003@+60~100?5@0~125
NE1617ADS/01No Longer ManufacturedSOT519-1100~1203.0~5.51@+60~100?2@0~1253.0~5.591003@+60~100?5@0~125
NE1617ADS/CD8458/NNo Longer ManufacturedSOT519-1100~1203.0~5.51@+60~100?2@0~1253.0~5.591003@+60~100?5@0~125
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateEFRIFR(FIT)MTBF(hour)MSLMSL LF
NE1617ADSSOT519-1SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE
SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveNE1617ADS,118 (9352 681 19118)NE1617ANE1617ADSweek 13, 20050.03.03.33E811
Bulk PackActiveNE1617ADS,112 (9352 681 19112)NE1617ANE1617ADSweek 13, 20050.03.03.33E811
Temperature monitor for microprocessor systems ne1617ads
Level shifting techniques in I2C-bus design pca9685pw
Digital temperature sensor accuracy explained se95u
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
Precise thermal monitoring with small, accurate temp sensors; NXP® temperature sensors NE1617A & NE1619 ne1619ds
Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for... PMEG6010CE_AUTOMOTIVE
I2C-bus temperature sensors; Small, accurate, low-cost sensors for advanced temperature regulation se95u
plastic shrink small outline package; 16 leads; body width 3.9 mm; lead pitch 0.635 mm 74CBTLV3257_Q100
Footprint for reflow soldering 74HC_T_595_Q100
SSOP-TSSOP-VSO-WAVE LPC1114FDH28
SSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code... 74CBTLV3257_Q100
NE1617ADS