EMC2105
RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
General Description
The EMC2105 is an SMBus compliant fan controller with up to five (up to 4 external and 1 internal) temperature channels. The fan driver can be operated using two methods each with two modes. The methods include an RPM based Fan Speed Control Algorithm and a direct drive setting. The modes include manually programming the desired settings or using the internal programmable temperature look-up table to select the desired setting based on measured temperature.
The temperature monitors offer 1°C accuracy (for external diodes) with sophisticated features to reduce errors introduced by series resistance and beta variation of substrate thermal diode transistors commonly found in processors.
The EMC2105 also includes a hardware programmable temperature limit and dedicated system shutdown output for thermal protection of critical circuitry.
Features
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Programmable Fan Control circuit
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600mA, 5V, High Side Fan Driver |
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Optional fan aging detection |
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RPM based fan control algorithm
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2% accuracy from 500RPM to 16k RPM |
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Temperature Look-Up Table
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Allows programmed fan response to temperature |
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1 to 4 thermal zones to control fan driver |
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Controls fan speed or fan drive setting |
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Allows externally generated temperature data to control fan drivers including two DTS channels |
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Up to Four External Temperature Channels
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Designed to support 45nm, 60nm, and 90nm CPUs |
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Automatically detects and supports CPUs requiring the BJT or Transistor models |
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Resistance error correction |
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1°C accurate (60°C to 100°C) |
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0.125°C resolution |
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Detects fan aging and variation |
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Up to three thermistor compatible voltage inputs |
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Hardware Programmable Thermal Shutdown Temperature
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Cannot be altered by software |
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60°C to 122°C Range or 92°C to 154°C Range |
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Programmable High and Low Limits for all channels |
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3.3V Supply Voltage |
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SMBus 2.0 Compliant
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SMBus Alert compatible |
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Available in 20-pin, QFN Lead-Free RoHS Compliant Package (4mm x 4mm) |
Applications
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Notebook Computers |
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Embedded Applications |
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Projectors |
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Industrial and Networking Equipment |
EMC2105 Block Diagram
ORDERING INFORMATION
| Ordering Number | Package | Features |
| EMC2105-1-BP | 20 pin QFN (Lead-Free ROHS compliant) | Single High Side Fan driver, up to
4 external diode measurement channels, one Critical/Thermal Shutdown input |
Reel size is 4,000 pieces
 EMC2105 Data Sheet, Application Notes,
Drivers and Design Tools
| Description |
File Name |
File Size |
Date |
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| EMC2105 Data Brief |
2105db.pdf |
141K |
5/8/08 |
| EMC2105 Data Sheet |
2105.pdf |
1351K |
5/8/08 |
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| Evaluation Board |
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EVB-EMC2105
Schematic, PDF
Bill of Materials, PDF
Users Guide, PDF |
evb2104_2105sch.pdf
evb2105bom.pdf
evb2104_2105user.pdf |
227K
80K
543K |
9/7/07
7/6/07
8/21/07 |
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| Application Notes |
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| Application Note 10-14: Using Temperature Sensing Diodes with EMC Devices - Remote Sensors |
an1014.pdf |
162K |
7/18/06 |
| Application Note 12-14: Remote Thermal Sensing Diode Selection Guide |
an1214.pdf |
216K |
9/9/05 |
| Application Note 13-19: Resistance Error Correction |
an1319.pdf |
210K |
11/11/05 |
| Application Note 14-0: SMBus Temperature Sensors from SMSC in an I2C System |
an140.pdf |
119K |
12/12/05 |
| Application Note 16-4: Using Anti-Parallel Diode (APD) with SMSC Temperature Sensors |
an164.pdf |
185K |
4/26/07 |
| Application Note 17-1: Power and Layout Considerations for EMC2105 |
an171.pdf |
242K |
10/4/07 |
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| Other Information |
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| Using the Adobe® Acrobat® Reader |
aacrobat.html |
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