getInstance = function() {

		var oIntervalTrigger = new IntervalTrigger(200);
		getInstance = function() {
			return oIntervalTrigger;
		};
		return oIntervalTrigger;
	}
Central instance of the IntervalTrigger (Singleton)

@example <caption>Create instance</caption>

sap.ui.require(["sap/ui/core/IntervalTrigger"], function(IntervalTrigger) {
    var fnDoIt = function(){
        // my code
    }
    IntervalTrigger.addListener(fnDoIt, this);
    IntervalTrigger.removeListener(fnDoIt, this);
});

Note: Only <code>addListener</code> and <code>removeListener</code> functions are exposed such that the
singleton can neither be destroyed nor the interval can be modified.

@return {sap.ui.core.IntervalTrigger} the instance with 200ms interval