EMC2301

The EMC2301 is an SMBus compliant fan controller with a PWM fan driver. The fan driver is controlled by a programmable frequency PWM driver and Fan Speed Control algorithm that operates in either a closed loop fashion or as a directly PWM-controlled device.

Each closed loop Fan Speed Control algorithm (FSC) has the capability to detect aging fans and alert the system. It will likewise detect stalled or locked fans and trigger an interrupt.

Additionally, the EMC2301 offers a clock output so that multiple devices may be chained and slaved to the same clock source for optimal performance in large distributed systems.

Features
  • Programmable Fan Control circuit 4-wire fan compatible High speed PWM (26 kHz) Low speed PWM (9.5Hz - 2240 Hz) Optional detection of aging fans Fan Spin Up Control and Ramp Rate Control Alert on Fan Stall
  • 4-wire fan compatible
  • High speed PWM (26 kHz)
  • Low speed PWM (9.5Hz - 2240 Hz)
  • Optional detection of aging fans
  • Fan Spin Up Control and Ramp Rate Control
  • Alert on Fan Stall
  • Watchdog Timer
  • RPM-based fan control algorithm 0.5% accuracy from 500 RPM to 16k RPM (external crystal oscillator) 1% accuracy from 500 RPM to 16k RPM (internal clock)
  • 0.5% accuracy from 500 RPM to 16k RPM (external crystal oscillator)
  • 1% accuracy from 500 RPM to 16k RPM (internal clock)
  • SMBus 2.0 Compliant SMBus Alert compatible
  • SMBus Alert compatible
  • CLK Pin can provide a clock source output
  • Available in an 8-pin MSOP RoHS Compliant package
  • Servers
  • Projectors
  • Industrial and Networking Equipment
  • Notebook Computers
Parameter
Parameter Name Value Value
comments Fan Speed Controller Fan Speed Controller
# Fans Drivers 1 1
PWM/Linear Control PWM PWM
Typical Accuracy N/A N/A
Max Accuracy N/A N/A
Maximum Temperature Range -40 to 125 -40 to 125
Vcc Range (V) 3.0 to 3.6 3.0 to 3.6
SMBus Alert Yes Yes
Voltage Monitors N/A N/A
Documents
EMC2301 RPM-Based PWM Fan Controller Data SheetData Sheets05/18/2011612KB
AN17.4 - RPM to TACH Counts ConversionAppNote05/05/2009447KB
EMC2301 RPM-Based PWM Fan Controller Data BriefProduct Briefs05/18/2011164KB
EMC2301 Library Part, Object Library FileSchematics02/07/20096KB
EMC2301 Reference Design Schematic, PDFSchematics02/11/200922KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
EMC2301-1-ACZL-TR8MSOP-40C to +125CT/R0.930.780.710.680.67
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RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
EMC2301-1-ACZL-TR0.0256000.2156008MSOP3x3mmMatte Tine3
EMC2301 RPM-Based PWM Fan Controller Data Sheet EMC2301
AN17.4 EMC2305
EMC2301 RPM-Based PWM Fan Controller Data Brief EMC2301
EMC2301 Reference Design Schematic, PDF EMC2301