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/Description	Modified Date
Temperature monitor for microprocessor systems (REV 5.0) PDF (305.0 kB) NE1617A	20 Mar 2012

Application Notes (3)

Name/Description	Modified Date
Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN10441	20 Jun 2007
Digital temperature sensor accuracy explained (REV 1.0) PDF (111.0 kB) AN10349	09 Aug 2006
I2C manual (REV 1.0) PDF (4.2 MB) AN10216	27 Mar 2003

Users Guides (3)

Name/Description	Modified Date
I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM10204	28 Apr 2014
I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA	03 Apr 2013
I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM10206	13 Jun 2006

Brochures (3)

Name/Description	Modified Date
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 75017540	01 Aug 2014
Precise thermal monitoring with small, accurate temp sensors; NXP® temperature sensors NE1617A & NE1619 (REV 1.0) PDF (253.0 kB) 75016533	01 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) 75016543	01 Jun 2008

Selector Guides (1)

Name/Description	Modified Date
I2C-bus temperature sensors; Small, accurate, low-cost sensors for advanced temperature regulation (REV 1.0) PDF (675.0 kB) 75015693	01 Nov 2006

Package Information (1)

Name/Description	Modified 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) SOT519-1	08 Feb 2016

Packing (1)

Name/Description	Modified 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_118	20 Oct 2015

Supporting Information (2)

Name/Description	Modified Date
Footprint for reflow soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-REFLOW	08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE	08 Oct 2009

Ordering Information

Product	Status	Package version	Standby current (uA)	Operating Temperature (Cel)	I2C-bus controlled	Accuracy on-chip (±°C)	Operating voltage (VDC)	Assignable addresses	SMBus clock (kHz)	Accuracy remote (±°C)
NE1617ADS	Active	SOT519-1	10	0~120	3.0~5.5	1@+60~100?2@0~125	3.0~5.5	9	100	3@+60~100?5@0~125
NE1617ADS/G	No Longer Manufactured	SOT519-1	10	0~120	3.0~5.5	1@+60~100?2@0~125	3.0~5.5	9	100	3@+60~100?5@0~125
NE1617ADS/01	No Longer Manufactured	SOT519-1	10	0~120	3.0~5.5	1@+60~100?2@0~125	3.0~5.5	9	100	3@+60~100?5@0~125
NE1617ADS/CD8458/N	No Longer Manufactured	SOT519-1	10	0~120	3.0~5.5	1@+60~100?2@0~125	3.0~5.5	9	100	3@+60~100?5@0~125

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
NE1617ADS		SOT519-1	SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	NE1617ADS,118 (9352 681 19118)	NE1617A	NE1617ADS		week 13, 2005	0.0	3.0	3.33E8	1	1
NE1617ADS		SOT519-1		Bulk Pack	Active	NE1617ADS,112 (9352 681 19112)	NE1617A	NE1617ADS		week 13, 2005	0.0	3.0	3.33E8	1	1