RPM-Based High Side Fan Controller with Hardware Thermal Shutdown

Features

  • Programmable Fan Control circuit
    • 600mA, 5V, High Side Fan Driver
    • Optional fan aging detection
  • RPM based fan control algorithm
    • 2% accuracy from 500RPM to 16k RPM
  • Temperature Look-Up Table
    • Allows programmed fan response to temperature
    • 1 to 4 thermal zones to control fan driver
    • Controls fan speed or fan drive setting
    • Allows externally generated temperature data to control fan drivers including two DTS channels
  • Up to Four External Temperature Channels
    • Designed to support 45nm, 60nm, and 90nm CPUs
    • Automatically detects and supports CPUs requiring the BJT or Transistor models
    • Resistance error correction
    • 1°C accurate (60°C to 100°C)
    • 0.125°C resolution
    • Detects fan aging and variation
  • Up to three thermistor compatible voltage inputs
  • Hardware Programmable Thermal Shutdown Temperature
    • Cannot be altered by software
    • 60°C to 122°C Range or 92°C to 154°C Range
  • Programmable High and Low Limits for all channels
  • 3.3V Supply Voltage
  • SMBus 2.0 Compliant
    • SMBus Alert compatible
  • Available in 20-pin, QFN Lead-Free RoHS Compliant Package (4mm x 4mm)

Applications

  • Notebook Computers
  • Embedded Applications
  • Projectors
  • Industrial and Networking Equipment

EMC2105 Block Diagram

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Although the information in this document has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to product descriptions and specifications at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order. Products may contain design defects or errors known as anomalies which may cause a product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC's website at http://www.smsc.com. SMSC and the SMSC logo are registered trademarks of Standard Microsystems Corporation ("SMSC"). Other names mentioned may be trademarks of their respective holders. All claims made herein speak as of the date of this material. The company does not undertake to update such statements.

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