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why tms320vc5509a's RTC using high power

Dear:

I have design a 5509 system and fond a problem, which is: when the rest of dsp is powered down, the rtc power  will be used up very soon, about one weed.

Because of that I measured the current and I found the the current can goes up to 15uA, sometimes can goes upto 1mA, is that ok?