LAN8740A - Ethernet PHY Wake-on-LAN (WOL) Feature Clarification

Wake-on-LAN (WOL) is a system power saving feature. It enables the entire system to go to sleep, with the PHY being the only active component. The PHY won't see significant power savings since the PHY is the only chip that is active. The PHY still needs to have all the transmitters, receivers, and PLLs running to maintain the link with the network. It triggers the digital output that can wake up the rest of the system once the magic packet is seen by the PHY. The power savings come from the rest of the system going to sleep.

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.