MAX6651

PRODUCTION

Fan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface

Controls and Monitors Fan Speed for High-Performance Thermal Management

Data Sheet (Rev. 6) Product Selection Table
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Overview

  • Closed/Open-Loop Fan-Speed Control for 5V/12V Fans
  • 2-Wire SMBus/I²C-Compatible Interface
  • Monitors Tachometer Output
    • Single Tachometer (MAX6650)
    • Up to Four Tachometers (MAX6651)
  • Programmable Alert Output
  • GPIOs
  • Hardware Full-On Override
  • Synchronize Multiple Fans
  • Four Selectable Slave Addresses
  • 3V to 5.5V Supply Voltage
  • Small Packages
    • 10-Pin µMAX (MAX6650)
    • 16-Pin QSOP (MAX6651)

The MAX6650/MAX6651 fan controllers use an SMBus/I²C-compatible interface to regulate and monitor the speed of 5VDC/12VDC brushless fans with built-in tachometers. They automatically force the fan's tachometer frequency (fan speed) to match a preprogrammed value in the Fan-Speed Register by using an external MOSFET or bipolar transistor to linearly regulate the voltage across the fan. The MAX6650 regulates the speed of a single fan by monitoring its tachometer output. The MAX6651 also regulates the speed of a single fan, but it contains additional tachometer inputs to monitor up to four fans and control them as a single unit when they are used in parallel.

The MAX6650/MAX6651 provide general-purpose input/output (GPIO) pins that serve as digital inputs, digital outputs, or various hardware interfaces. Capable of sinking 10mA, these open-drain inputs/outputs can drive an LED. To add additional hardware control, configure GPIO1 to fully turn on the fan in case of software failure. To generate an interrupt when a fault condition is detected, configure GPIO0 to behave as an active-low alert output. Synchronize multiple devices by setting GPIO2 (MAX6651 only) as an internal clock output or an external clock input.

The MAX6650 is available in a space-saving 10-pin µMAX® package, and the MAX6651 is available in a small 16-pin QSOP package.

Applications

  • Computers: Desktop, Workstation, Server
  • Networking
  • RAID
  • Servers
  • Telecommunications
  • Workstations
MAX6651
Fan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface
MAX6650, MAX6651: Typical Operating Circuit
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Documentation

Data Sheet 1

User Guide 1

Design Note 2

Technical Articles 6

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Software Resources

Device Drivers 1

Evaluation Kits

MAX6651EVCMAXQU

MAX6651 Evaluation Kit/Evaluation System

Buy Now View Details

Features and Benefits

  • Proven PCB Layout
  • Convenient On-Board Test Points
  • Fully Assembled and Tested
  • EV System Includes USB Connectivity

Product Details

The MAX6651 evaluation kit (EV kit) is an assembled and tested printed-circuit board (PCB) that demonstrates the MAX6651 intelligent fan controller IC. Windows® 98SE/2000/XP-compatible software provides a handy user interface to exercise the MAX6651's features. Order the MAX6651 EV system for complete evaluation of the MAX6651, including a Maxim SMBus™ interface board (CMAXQUSB). Order the MAX6651 EV kit if you already have an SMBus interface.

Applications

  • Automated Test Equipment (ATE)
  • Bridges
  • Cell Phone Base Stations
  • Computers: Desktop, Workstation, Server
  • Network Hubs, Switches, Routers
  • Routers/Switches
  • Storage Systems
  • Telecom Switches
  • Test and Measurement Equipment
  • X-Ray and Ultrasound Diagnostics

MAX6651EVKIT

MAX6651 Evaluation Kit/Evaluation System

Buy Now View Details

Features and Benefits

  • Proven PCB Layout
  • Convenient On-Board Test Points
  • Fully Assembled and Tested
  • EV System Includes USB Connectivity

Product Details

The MAX6651 evaluation kit (EV kit) is an assembled and tested printed-circuit board (PCB) that demonstrates the MAX6651 intelligent fan controller IC. Windows® 98SE/2000/XP-compatible software provides a handy user interface to exercise the MAX6651's features. Order the MAX6651 EV system for complete evaluation of the MAX6651, including a Maxim SMBus™ interface board (CMAXQUSB). Order the MAX6651 EV kit if you already have an SMBus interface.

Applications

  • Automated Test Equipment (ATE)
  • Bridges
  • Cell Phone Base Stations
  • Computers: Desktop, Workstation, Server
  • Network Hubs, Switches, Routers
  • Routers/Switches
  • Storage Systems
  • Telecom Switches
  • Test and Measurement Equipment
  • X-Ray and Ultrasound Diagnostics
MAX6651EVCMAXQU
MAX6651 Evaluation Kit/Evaluation System
MAX6651EVKIT
MAX6651 Evaluation Kit/Evaluation System

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