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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 180kB) Download   E-Mail

Description

The MAX6646/MAX6647/MAX6649 are precise, two-channel digital temperature sensors. The devices accurately measure the temperature of their own die and a remote PN junction, and report the temperature in digital form using a 2-wire serial interface. The remote PN junction is typically the emitter-base junction of a common-collector PNP on a CPU, FPGA, or ASIC. The 2-wire serial interface accepts standard system management bus (SMBus™) write byte, read byte, send byte, and receive byte commands to read the temperature data and to program the alarm thresholds. To enhance system reliability, the MAX6646/MAX6647/MAX6649 include an SMBus timeout. A fault queue prevents the active-low ALERT and active-low OVERT outputs from setting until a fault has been detected one, two, or three consecutive times (programmable). The MAX6646/MAX6647/MAX6649 provide two system alarms: active-low ALERT and active-low OVERT. Active-low ALERT asserts when any of four temperature conditions are violated: local overtemperature, remote overtemperature, local undertemperature, or remote undertemperature. Active-low OVERT asserts when the temperature rises above the value in either of the two active-low OVERT limit registers. The active-low OVERT output can be used to activate a cooling fan, or to trigger a system shutdown. Measurements can be done autonomously, at the programmed conversion rate, or in a single-shot mode. The adjustable conversion rate allows optimizing supply current and temperature update rate to match system needs. Remote accuracy is ±1°C maximum error between +60°C and +145°C with no calibration needed. The MAX6646/MAX6647/MAX6649 operate from -55°C to +125°C, and measure temperatures between 0°C and +145°C. The MAX6646/MAX6647/MAX6649 are available in an 8-pin µMAX® package.

Key Features		Applications/Uses
Dual Channel: Measures Remote and Local Temperature 0.125°C Resolution High Accuracy ±1°C (max) from +60°C to +145°C (Remote), and ±2°C (max) from +60°C to +100°C (Local) Measures High-Ideality Thermal Diodes Up to +170°C (Apparent) +145°C (Real) Two Alarm Outputs: Active-Low ALERT and Active-Low OVERT Programmable Under/Overtemperature Alarm Temperature Thresholds Programmable Conversion Rate SMBus-Compatible Interface SMBus Timeout		Desktop Computers Graphics Processors Multichip Modules Notebook Computers Servers Test and Measurement Equipment Thin Clients Workstations

Diagram

Typical Operating Circuit

Application Notes

Application Note 1057: Compensating for Ideality Factor and Series Resistance Differences between Thermal Sense Diodes - MAX6646, MAX6647, MAX6649 Application Note 3178: Extended-Range Temperature-Sensing ICs - MAX6646, MAX6647, MAX6649 Application Note 3502: Effect of PC Board Trace Width on Remote-Diode Temperature-Sensor Accuracy - MAX6646, MAX6649

Design Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report: MAX6647.pdf MAX6646.pdf Show FIT data for: MAX6646 MAX6647 MAX6649 Request Reliability Report for: MAX6649

Software/Models

none

Ordering Information

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. More: SeeFull Data Sheet or Part 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.

Devices: 1-22 of 22

MAX6646	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6646MUA			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8CN-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6646MUA-T			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8CN-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6646MUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8CN+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6646MUA+T			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8CN+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6646YMUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6646YMUA+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6647	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6647MUA			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6647MUA-T			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6647MUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6647MUA+T			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6647YMUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6647YMUA+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6649	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6649MUA-TG002			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6649MUA/V+			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6649MUA/V+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6649MUA-G002			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6649MUA			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6649MUA-T			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX6649MUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6649MUA+T			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6649YMUA+			Active	µMAX;8 pin;16.2 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6649YMUA+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet

More Information

Topmark Coding: MAX6646 MAX6647 MAX6649 New Product Press Release 2003-07-22  Temperature Family by Product Type

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