Louis was also sentenced to three years of informal probation and a $565 fine as part of his plea deal with the San Diego City Attorney's Office after pleading guilty Friday to misdemeanor assault.
Authorities say Louis assaulted SDSU teammate Nick Sandford in a team meeting room the fall of 2008. Sandford suffered a concussion, broken eardrum and fractured cheekbone.
The Bears have said they were aware of the incident before they drafted Louis. He could be subject to discipline under the NFL's personal conduct policy.
Copyright 2010 by The Associated Press