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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

Evaluation Kits

none

Design Guides

TEMP SENSORS (PDF)

Reliability Reports

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

Software/Models

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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	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6678AEP90			QSOP;20 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E20-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678AEP96-T				-40°C to +125°C	See data sheet
MAX6678AEP96			QSOP;20 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E20-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678AEP94-T				-40°C to +125°C	See data sheet
MAX6678AEP94			QSOP;20 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E20-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678AEP92-T				-40°C to +125°C	See data sheet
MAX6678AEP92			QSOP;20 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E20-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678AEP90-T				-40°C to +125°C	See data sheet
MAX6678ATP96			THIN QFN;20 pin; Dwg: 21-0140L (PDF) Use pkgcode/variation: T2055-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678ATP94-T				-40°C to +125°C	See data sheet
MAX6678ATP94			THIN QFN;20 pin; Dwg: 21-0140L (PDF) Use pkgcode/variation: T2055-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678ATP92-T				-40°C to +125°C	See data sheet
MAX6678ATP92			THIN QFN;20 pin; Dwg: 21-0140L (PDF) Use pkgcode/variation: T2055-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678ATP90-T				-40°C to +125°C	See data sheet
MAX6678ATP90			THIN QFN;20 pin; Dwg: 21-0140L (PDF) Use pkgcode/variation: T2055-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6678ATP96-T				-40°C to +125°C	See data sheet

More Information

New Product Press Release 2004-05-26

Related Products

MAX6641 SMBus-Compatible Temperature Monitor with Automatic PWM Fan-Speed Controller MAX6640 2-Channel Temperature Monitor with Dual Automatic PWM Fan-Speed Controller MAX6643, MAX6644, MAX6645 Automatic PWM Fan-Speed Controllers with Overtemperature Output

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