This paper proposed a cross layer optimization model for energy efficient routing and minimum delay TDMA scheduling for periodic WSN applications. An ILP model with multi objective cost function is presented. In particular, the problem is formulated as an Integer Linear Program (ILP) model such that a joint scheduling and routing is developed to maximize network lifetime and to minimize delay. The ILP model is solved and demonstrated for different network configurations. The optimal solutions assuming different objectives are compared. In the future, we are planning to enhance the model further by including more objectives.