In addition to allowing you to control a fan, the EMC2101 includes an internal temperature sensor, as well as connections for an external temperature sensing diode. Instead of using a PWM output and counter input on your microcontroller, this chip will take care of that all for you, all over every-day I2C. The last TACH pin is for a tachometer output that allows the EMC2101 to monitor the speed of the fan to make sure it's working as expected. ![]() One of those extra pins, the PWM pin, allows you to set the speed of the fan. Programmable PWM output and tachometer input, with both internal and external temperature sensing, with a 1☌ accuracy, it's a perfect friend for any 3 or 4-pin PC fan you may find.įour pin PC fans have a power and ground pin (those are red and black) and then two more pins. The EMC2101 from Microchip/SMSC is a fan controller with temperature monitoring, and it will take care of all of that for you. OK, power takes two pins but what are these other pins for and how do I use them to convince this fan to keep my things chilly? One might rightfully think: "these fans are pretty good at moving air to keep things cool maybe I can use one of these neat computer fans to keep my widget frosty" followed closely by throwing up one's hands in confusion at the sight of a 3 or even 4-pin connector. Cooling fans.They're everywhere, and they serve the important purpose of keeping things cool, generally electronics.
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