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Control Resources offers new technical article on
I2C Communication for Fan Speed Control in Telecom Cooling Applications
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Nate Lavoie, CRI's VP of Engineering has developed more than fifty I2C based fan speed controls for telecom cooling applications. The I2C bus is generally considered the standard format for management communication within the telecom chassis. Nate offers his technical article as an aid to design engineers responsible for telecom cooling systems. The article provides an overview of the advantages of using the I2C bus and discusses three main elements of the I2C specification that are essential to ensure a stable and error free system: Open Collector Consideration, Clock Stretching and Error Detection.
Also provided is a link to "The I2C-bus and how to use it" from Philips Semiconductor (now NXP). The document is considered to be the best source of information for proper I2C-bus implementation. The article also includes a sample I2C flow protocol diagram and I2C protocol specification from CRI's SmartFan Fusion Fan Speed Control and Alarm. SmartFan Fusion is an off-the-shelf fan speed control and alarm design specifically for telecom cooling applications.
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September 2009 Newsletter
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SmartFan Cirrus-6 is a digital fan speed control and alarm that offers an off-the-shelf cooling solution for 4-wire DC fans and blowers. Cirrus-6 can control and monitor tach pulses from up to six 12, 24 or 48 VDC fans with open collector or 0-12 VDC control signal requirements. The controller accepts fan speed commands (including on/off) and provides individual pass/fail fan status via an I2C interface. The I2C interface also provides temperature readings from an on-board thermistor and EEPROM storage.
The Cirrus-6 can be configured to control fan speed based on temperature or analog control signal (PWM, 5.0 VDC). Configuration of the Cirrus-6 is settable via I2C interface or options can be set at the factory to your specifications. Special and custom configurations are available. ($65.60 ea/200 – available now).
Benefits of using SmartFan include acoustical noise reduction, energy savings, greater product reliability, increased fan life and improved safety.
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For additional information contact: Jim Quirk at 978-486-4160 X-207
Email: jquirk@controlres.com
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