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
The Microchip Web Site
Customer Change Notification Service
Customer Support
Microchip Devices Code Protection Feature
Legal Notice
Trademarks
Quality Management System Certified by DNV
Worldwide Sales and Service

Features

Base setup for performing core independent brushless DC motor (BLDC) commutation and dead-time insertion using Configurable Custom Logic (CCL)
100% CPU available after initialization for additional tasks like control, monitoring, and communication
Motor commutation based on Hall sensor signal using Analog Comparator (AC) and Configurable Custom Logic (CCL)
Dead-time insertion based on Hall sensor signal using Analog Comparator (AC), Event System (EVSYS), and 16-bit Timer/Counter Type B (TCB)
Pulse Width Modulated (PWM) signal generation using 16-bit Timer/Counter Type A (TCA)
Example setup for Microchip ATtiny817 Xplained Mini is provided