MAS3507D MP3 Decoder IC - DC/DC converter question.

Would any of the people out there using the MAS3507D MP3 decoder IC from Micronas please answer the following question related to its built-in DC/DC converter?

My question is: If the DC/DC converter is not used at all, and the pins related to it are connected as recommended in the MAS3507D datasheet; will the output of the voltage sense monitor (i.e. the PUP output pin) still work as expected? DCEN pin is pull-down to ground, VDD and VSENSE are connected together and the input voltage is 3.3V +/- 30mV. My observation is that PUP remains low even after the applied input voltage is stable. Am I missing something?

One more question: Will a clock signal only appear at CLKOUT after WSEN has been asserted?

Thank you in advance. Best Regards, Marco.

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Marco Castellon
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