Go to the "My Madden" option from the Main Menu. Then, choose the "Madden Codes" section from the "Madden Cards" screen. When you enter this screen you can enter the following cheat codes whenever you're ready.

Password - Effect

5LAWO0 - Use this Madden card and your opposition will just be able to throw high in the air passes, you should find it more easy to intercept those passes.

WROA0R - Use this Madden card and your Quarterback will have 100% accuracy for all of the current half.

XL7SP1 - Use this Madden card and your Quarterback will not throw an interception or fumble the ball for all of the current half.