AN2522

Introduction
Features
1 Relevant Devices
2 Device Specific Implementation Details
Some details are specific for the device or device group the accompanying code was written for, thus they may or may not be applicable for other devices. The details described below apply to, but are not necessarily limited to, tinyAVR® 1-series.
3 Theory of Operation
4 CCL BLDC Fan Controller Implementation
5 CCL BLDC Fan Hardware Suggestions
The accompanying code includes support for adjusting the PWM duty cycle with the on-board button of the ATtiny817 Xplained Mini. Other than this, there is no specific hardware provided or described for this application note. For this reason, and the fact that BLDC motors and their control circuits come in many different varieties, two specific fan hardware layouts that will fit the described device setup are outlined below.
6 CCL BLDC Fan Further Development
7 Get Source Code from Atmel | START
8 Terms and Abbreviations
9 Revision History
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3 Theory of Operation

The design presented in this application note could be applied to a range of systems using a simple BLDC motor with Hall sensor feedback. Since a very common application would be that of a cooling fan, the application note focuses mainly on that particular usage.

The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.