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Maxim > Products > Thermal Management > MAX1668, MAX1805, MAX1989

MAX1668, MAX1805, MAX1989

Multichannel Remote/Local Temperature Sensors

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX1668/MAX1805/MAX1989 are precise multichannel digital thermometers that report the temperature of all remote sensors and their own packages. The remote sensors are diode-connected transistors—typically low-cost, easily mounted 2N3904 NPN types—that replace conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed. The remote channels can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor.

The 2-wire serial interface accepts standard system management bus (SMBus™) write byte, read byte, send byte, and receive byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1°C, in two's-complement format.

The MAX1668/MAX1805/MAX1989 are available in small, 16-pin QSOP surface-mount packages. The MAX1989 is also available in a 16-pin TSSOP.

Data Sheet

Download	Rev 2	(PDF, 504kB)
E-Mail

An evaluation kit is available: MAX1668EVSYS

Key Features

Multichannel
- 4 Remote, 1 Local (MAX1668/MAX1989)
- 2 Remote, 1 Local (MAX1805)
No Calibration Required
SMBus 2-Wire Serial Interface
Programmable Under/Overtemperature Alarms
Supports SMBus Alert Response
Accuracy
- ±2°C (+60°C to +100°C, Local)
- ±3°C (-40°C to +125°C, Local)
- ±3°C (+60°C to +100°C, Remote)
3µA (typ) Standby Supply Current
700µA (max) Supply Current
Small, 16-Pin QSOP/TSSOP Packages

Applications/Uses

Central Office Telecom Equipment
Desktop/Notebook Computers
Industrial Controls
LAN Servers
Multichip Modules
Test and Measurement Equipment

Key Specifications:

Temperature Sensors

Part Number

Sensor Type

Alarm Output

Functions

Interface

Remote Chan.

Accuracy
(±°C)

Parasite Pwr.

Temp. Resolution
(bits)

Oper. Temp.
(°C)

Smallest Available Pckg.
(mm²)

Budgetary Price

max w/pins

See Notes

MAX1668

Remote

Alert

Remote & Local Sensor

2-Wire/I²C/SMBus

Quad

-55 to +125

30.9

$4.32 @1k

MAX1805

Dual

30.9

$3.93 @1k

MAX1989

Quad

33.4

$4.60 @1k

See All Temperature Sensors (103)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Application Notes

Application Note 687		Distributed Temperature Sensing Improves Reliability
Application Note 694		Temperature Sensor ICs Simplify Designs

Product Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report:	MAX1668.pdf
Show FIT data for:
Request Reliability Report for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1668EVKIT			Active	KIT; Land Pattern: Not Available		See data sheet
MAX1668MEE			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1668MEE+			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1668MEE+T			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1668MEE-T			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1805MEE			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1805MEE+			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1805MEE+T			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1805MEE-T			Active	QSOP;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1989MEE			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1989MEE+			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1989MEE+T			Active	QSOP;16 pin;30.9 mm² Outline Drawing:21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1989MEE-T			Active	QSOP;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1989MUE			Active	TSSOP;16 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1989MUE+			Active	TSSOP;16 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1989MUE+T			Active	TSSOP;16 pin;33.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0117 (PDF) Use pkgcode/variation: U16+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1989MUE-T			Active	TSSOP;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

MAX1668EVSYS

Evaluation System for the MAX1668

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