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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 704kB) Download   E-Mail

Description

The MAX6678 monitors its own temperature and the temperatures of two external diode-connected transistors, which typically reside on the die of a CPU or other integrated circuit. The device reports temperature values in digital form using a 2-wire serial interface. The MAX6678 provides a programmable alarm output to generate interrupts, throttle signals, or overtemperature shutdown signals. 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 program the alarm thresholds. The temperature data controls a PWM output signal to adjust the speed of a cooling fan, thereby minimizing noise when the system is running cool, but providing maximum cooling when power dissipation increases. Five GPIO pins provide additional flexibility. The GPIO power-up states are set by connecting the GPIO preset inputs to ground or VCC. The MAX6678 is available in a 20-pin QSOP package and a 5mm x 5mm thin QFN package. It operates from 3.0V to 5.5V and consumes just 500µA of supply current.

Key Features		Applications/Uses
Two Thermal-Diode Inputs Local Temperature Sensor Five GPIO Input/Outputs Two PWM Outputs for Fan Drive (Open Drain; May Be Pulled Up to +5V) Programmable Fan-Control Characteristics Automatic Fan Spin-Up Ensures Fan Start Controlled Rate of Change Ensures Unobtrusive Fan-Speed Adjustments 1°C Remote Temperature Accuracy (+60°C to +145°C) Temperature Monitoring Begins at POR for Fail-Safe System Protection OT-bar Output for Throttling or Shutdown Four Versions Available, Each with a Different Address 5mm x 5mm TQFN Package		Desktop Computers Networking Equipment Notebook Computers Servers Workstations

Diagram

Typical Application Circuit

Design Guides

Thermal Management (PDF)

Reliability Reports

Show FIT data for: MAX6678 Request Reliability Report for: MAX6678

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: 1-16 of 16

MAX6678	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6678AEP90			Active	QSOP;20 pin;54 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0168 (PDF) Use pkgcode/variation: E20-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678AEP90-T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX6678AEP92			Active	QSOP;20 pin;54 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0168 (PDF) Use pkgcode/variation: E20-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678AEP92-T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX6678AEP94			Active	QSOP;20 pin;54 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0168 (PDF) Use pkgcode/variation: E20-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678AEP94-T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX6678AEP96			Active	QSOP;20 pin;54 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0168 (PDF) Use pkgcode/variation: E20-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678AEP96-T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX6678ATP90			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678ATP90-T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX6678ATP92			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678ATP92-T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX6678ATP94			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678ATP94-T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX6678ATP96			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678ATP96-T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet

More Information

New Product Press Release 2004-05-26

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