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FG4618的LCDA在LPM3下工作电流为什么这么大

Other Parts Discussed in Thread: MSP430FG4618

小弟这几天在测试MSP430驱动LCD的功耗测试,手里有的MSP430FG4618的测试板,板上只有两个晶振32768Hz和30MHz,还有就是基本上电复位电路,测试使用库的标准例子。以下是测试的结程序和结果: 

1:当按照上面的程序进行测试里,LCD屏接与不接,电流都在0.1~0.2uA;

2:当把程序中的休眠模式改成LPM3时,不接LCD屏电流40~45uA,接上LCD屏电流50~60uA;

3:如果把程序中LCDA初始化部分去除,同样在LPM3模式下,测试板电流2.5uA左右;

请问各位高手,LCDA的工作电流真的这么大吗?这好像手册中说只要3uA?如何进一点减小功耗呢?

PS:所用LCD屏为3.3V 4mux + 3bias的笔段屏

 谢谢啦!