EMC2112

The EMC2112 is an SMBus, closed-loop, RPM-based fan driver with hardware (HW) thermal shutdown and reset controller. The EMC2112 offers a single High Side fan driver capable of sourcing up to 600mA from a 5V supply.

The EMC2112 utilizes Beta Compensation (an implementation of the BJT or transistor model for thermal diodes) and Resistance Error Correction (REC) to accurately monitor up to three (3) external temperature zones. These features allow great accuracy for CPU substrate thermal diodes on multiple process geometries as well as with discrete diode-connected transistors. Both Beta Compensation and REC can be disabled on the EMC2112 to maintain accuracy when monitoring AMD thermal diodes.

The EMC2112 provides a stand-alone HW thermal shutdown block. The HW thermal shutdown logic can be configured for a few common configurations based on the strapping level of the SHDN_SEL pin on the PCB. The HW thermal shutdown point can be set in 1°C increments by using a discrete resistor connected to the TRIP_SET pin.

The EMC2112 also provides 5V supply 'power good' function with a threshold of 4.5V. This function is provided on the RESET# pin.

Features
  • Closed-Loop RPM-Based Fan Controller 1% accuracy with external clock input 3% accuracy with internal clock Internal clock can be used as a source Aging fan detection
  • 1% accuracy with external clock input
  • 3% accuracy with internal clock
  • Internal clock can be used as a source
  • Aging fan detection
  • Integrated Linear Fan Driver 600mA drive capability
  • 600mA drive capability
  • HW Thermal Shutdown (SYS_SHDN#) 1°C incremental set points for thermal shutdown Cannot be disabled by software
  • 1°C incremental set points for thermal shutdown
  • Cannot be disabled by software
  • Provides Reset Function (RESET#) On 5V Supply
  • Up to Three (3) Remote Thermal Zones ±1°C accuracy (60°C to 100°C) 0.125°C resolution Designed to support 45nm, 65nm, and 90nm CPU Diodes using BJT and transistor model Eliminates temperature offset due to series resistance from PCB traces and thermal 'Diode'
  • ±1°C accuracy (60°C to 100°C)
  • 0.125°C resolution
  • Designed to support 45nm, 65nm, and 90nm CPU Diodes using BJT and transistor model
  • Eliminates temperature offset due to series resistance from PCB traces and thermal 'Diode'
  • Operates From Single 3.0 - 3.6V Supply 5V supply for linear fan driver and reset generator
  • 5V supply for linear fan driver and reset generator
  • SMBus 2.0 and I2C™ compatible User selectable SMBus address using pull-up resistor on ADDR_SEL pin Supports Block Read and Write functionality
  • User selectable SMBus address using pull-up resistor on ADDR_SEL pin
  • Supports Block Read and Write functionality
  • Available in 20-pin, 4x4 QFN RoHS Compliant package
  • Notebook Computers
  • Desktop Computers
  • Embedded Applications
Parameter
Parameter Name Value Value
comments Fan Controller with Thermal Mgt Fan Controller with Thermal Mgt
# Fans Drivers 1 1
PWM/Linear Control Linear Linear
# Remote Temperature Monitors 3 3
Ambient Temperature Sensor 1 1
Typical Accuracy ±0.25 ±0.25
Max Accuracy ±1.0 ±1.0
Maximum Temperature Range 0 to 85 0 to 85
Vcc Range (V) 3.3 to 5.0 3.3 to 5.0
SMBus Alert Yes Yes
System Shutdown Yes Yes
Documents
EMC2112 RPM-Based Linear Fan Controller with Hardware Thermal Shutdown Data SheData Sheets11/20/2009862KB
AN10.14 - Using Temperature-Sensing Diodes with Remote Thermal SensorsAppNote11/17/2014250KB
AN12.14 - Remote Thermal Sensing Diode Selection GuideAppNote11/17/2014293KB
AN13.19 - Resistance Error CorrectionAppNote11/09/2014161KB
AN16.4 - Using Anti-Parallel Diodes (APD) with Microchip's Remote Temperature Sensing DevicesAppNote11/09/2014294KB
AN17.4 - RPM to TACH Counts ConversionAppNote05/05/2009447KB
AN18.15 - PCB Design Guidelines for QFN and DQFN PackagesAppNote10/16/2014205KB
AN617_SMSC - Definitions and Differences Between I2C, ACCESS.bus and SMBusAppNote09/22/2013143KB
EMC2112 RPM-Based Linear Fan Controller with Hardware Thermal Shutdown Data BriProduct Briefs11/20/2009209KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
EMC2112-BP-TR20QFN0C to +85CT/R1.481.231.121.081.07
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RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
EMC2112-BP-TR0.0431000.21212120QFN4x4x0.9mmMatte Tine3
EMC2112 RPM-Based Linear Fan Controller with Hardware Thermal Shutdown Data She EMC2112
EMC2112 RPM-Based Linear Fan Controller with Hardware Thermal Shutdown Data She EMC2112
AN10.14 EMC2113
AN12.14 EMC2113
AN13.19 EMC2113
AN16.4 EMC2113
AN17.4 EMC2305
AN18.15 LAN9220
AN617_SMSC EMC2112
EMC2112 RPM-Based Linear Fan Controller with Hardware Thermal Shutdown Data Bri EMC2112