SMSC fan speed controller scales thermal management
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SMSC announced its EMC230x fan speed controller family that consists of
four new devices - the EMC2301, EMC2302, EMC2303 and EMC2305. The
EMC230x family is designed to receive drive signals from the central
host and hold fan speeds to within one percent accuracy. The EMC230x
family of devices does this by actively monitoring the fan’s tachometer
feedback and then adjusting the speed, as needed, to hit a given
target. By accurately controlling fan speed, better acoustic and
thermal performance can be maintained, yielding a more reliable and
predictable design.
When using multiple EMC230x devices within a system, fan speeds can be synchronized for optimal performance of a clock output. If the designer chooses not to synchronize clocks, this option can be utilized as a more accurate clock input to yield 0.5 percent fan speed accuracy. On smaller systems, a designer may simply need to extend the architecture by one fan driver to obtain optimal performance. For these instances, use of the EMC2301 controller is ideal, since the fan drive instructions can be issued over the I2C bus to the EMC2301 to drive an additional fan.
For improved system reliability, all devices in the fan speed controller family can issue important system alerts. These include events such as stalled or aging fans, which help prevent system shut down and overheating. With this information, servicing and troubleshooting fan failures is faster and easier.
Device Number of Fans Pin/Package
EMC2301 Single Fan Speed Controller 8-pin MSOP
EMC2302 Dual Fan Speed Controller 10-pin MSOP
EMC2303 Triple Fan Speed Controller 12-pin 4x4 QFN
EMC2305 Five Fan Speed Controller 6-pin 4x4 QFN
For improved system reliability, all devices in the fan speed controller family can issue important system alerts. These include events such as stalled or aging fans, which help prevent system shut down and overheating. With this information, servicing and troubleshooting fan failures is faster and easier.
Device Number of Fans Pin/Package
EMC2301 Single Fan Speed Controller 8-pin MSOP
EMC2302 Dual Fan Speed Controller 10-pin MSOP
EMC2303 Triple Fan Speed Controller 12-pin 4x4 QFN
EMC2305 Five Fan Speed Controller 6-pin 4x4 QFN
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