MAX6639

PRODUCTION

2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller

High-Frequency, Dual Temperature Sensor and Fan Controller with Selectable Address and Closed-Loop Operation

Data Sheet (Rev. 3) Product Selection Table
Part Models
7
1ku List Price
Starting From $2.09
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Part Details

  • Two Thermal-Diode Inputs
  • Up to 25kHz PWM Output Frequency
  • Three Selectable SMBus Addresses
  • Local Temperature Sensor
  • 1°C Remote Temperature Accuracy
  • Two PWM Outputs for Fan Drive (Open Drain; Can be Pulled Up to +13.5V)
  • Programmable Fan-Control Characteristics
  • Automatic Fan Spin-Up Ensures Fan Start
  • Controlled Rate-of-Change Ensures Unobtrusive Fan-Speed Adjustments
  • ±3% Fan-Speed Measurement Accuracy
  • Temperature Monitoring Begins at POR for Fail-Safe System Protection
  • Active-Low OT and Active-Low THERM Outputs for Throttling or Shutdown
  • Measures Temperatures Up to +150°C
  • MAX6639F is Optimized for n = 1.021 for Penryn Compatibility
MAX6639
2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller
MAX6639: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 6

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Software Resources

Device Drivers 1

Tools & Simulations

Software Development 1

IBIS Model 1

Evaluation Kits

MAX6639EVKIT

Evaluation Kit for the MAX6639 and MAX6639F

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Features and Benefits

  • Two Thermal-Diode Inputs
  • Local Temperature Sensor
  • Programmable Temperature Alarms
  • Two PWM Outputs for Fan Drive
  • Up to 25kHz PWM Output Frequency
  • Programmable Fan-Control Characteristics
  • 3-Wire and 4-Wire Fan Configurations
  • On-Board Microcontroller to Generate SMBus™ /I²C Commands
  • USB-PC Connection (Cable Included)
  • Windows 2000/XP- and Windows Vista (32-Bit)-Compatible Software
  • Easy-to-Use, Menu-Driven Software
  • Lead(Pb)-Free and RoHS Compliant
  • Fully Assembled and Tested

Product Details

The MAX6639 evaluation kit (EV kit) is an assembled and tested PCB used to evaluate the MAX6639 dual temperature sensor/fan controller. The MAX6639 monitors its own die temperature and the junction temperature of one external diode-connected transistor, or the junction temperatures of two external diode-connected transistors. It converts the temperature to 8-bit or 11-bit 2-wire serial data that can be accessed over a 2-wire serial bus.

The MAX6639 EV kit includes both external diode-connected transistors (2N3906) soldered to the board, which can be bypassed to connect the board through a twisted pair to remote diodes close to your system.

The temperature data is also used by the internal dual PWM fan-speed controller to adjust the speed of up to two cooling fans. Speed control is accomplished by tachometer feedback from the fan.

The EV kit also includes Windows® 2000/XP- and Windows Vista®-compatible software, which provides a simple user interface for exercising the features of the MAX6639. The program is menu-driven and offers a graphical user interface (GUI) complete with control buttons. The EV kit comes with the MAX6639AEE+ installed. Contact the factory for free samples of the pin-compatible MAX6639FAEE+ and MAX6640AEE+.

The MAX6639 EV kit also evaluates the MAX6640. The MAX6640 is not recommended for new designs.

Applications

  • Desktop Computers
  • Networking Equipment
  • Notebook Computers
  • Projectors
  • Servers
MAX6639EVKIT
Evaluation Kit for the MAX6639 and MAX6639F

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