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K20 USB with external clock

Question asked by Kari Piipponen on Sep 11, 2012
Latest reply on Jan 2, 2013 by Kari Piipponen

Hi all,


Has anybody tried to use Kinetis as USB Device employing the usb_clkin (PTE26) pin and provide usb clock externally? Is it possible to maintain device enumeration when kinetis is in low power mode if you provide 48MHz clock to usb externally?


My problem is that the lowest current consumption that enables usb enumeration is about 33mA. (>150mW, from 5V supply!!)


This is achieved WAIT mode, 48MHz.