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Powering down a MSC1212 from Texas Inst.

Hi !
I'm trying to put a MSC1212Y5 in power down mode. Despite all I have tried, the uC continues to draw a current of about 0.2...0.3mA, like there is some internal block (analog or digital) that isn't turned off. I have already wasted 3 days, trying to solve the problem. Sometimes, I succeed to obtain a current of less than 1 uA, but this doesn't lasts too much (maybe minutes) and the current rises again to few hundreds of uA. Anyhow, the small current (under 1 uA) it is obtained only if I cut the analog VDD off. Otherwise (with AVDD = 4.5V) the current through the AVDD pin is 0.25mA with all analog blocks turned off.
I have read all the application notes I have found: sbaa's, sbaaz's, sbyt's, errata's and so on...useless.
Can somebody (please) help me, because I'm in a terrible lack of ideas and (what's the most important) TIME !

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