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LM3429的模拟调光怎么使用?

Other Parts Discussed in Thread: LM3429

是这样的,我是想用LM3429实现一按下上面原理图的SW开关,灯就慢慢的亮,一松手,灯就慢慢的灭。我是打算用上图的RC充放电电路实现,然后接到LM3429的调光脚来控制它。因为nDIM只接收数字信号吧?我上图设计的是从0.0,0.1,0.2,0.3一直到1.8V变化的模拟信号,接到nDIM脚达不到效果。而接在CSH脚则好像达到它的阀值电压1.24V就突然亮灭,也达不到慢慢变化的效果,请问应该怎样实现阿?