topic Re: KE02Z64xxx4 10M osc startup problem in Kinetis Microcontrollers

KE02Z64xxx4 10M osc startup problem

rqbh — Fri, 19 Jun 2015 01:15:51 GMT

Hi, i have a customer board using ke02z64xxx4 with a 10M osc, but it cann't startup in FEE mode until you touch it using hand,

Does anyone met the same problem ? how can i find out what reason cause this problem?

thanks.

danielecortella — Fri, 19 Jun 2015 08:17:50 GMT

Hi,

try to put a 1Mohm resistor in parallel to the oscillator (between Extal and Xtal)

mjbcswitzerland — Fri, 19 Jun 2015 10:54:08 GMT

Make sure the high-/low gain mode is correctly set in OSC_CR

OSC_CR_HGO should be used with high loading and a feedback resistor but should not be set when there is no feedback resistor.

Regrds

Mark

For the complete "out-of-the-box" Kinetis experience and faster time to market

david_diaz — Mon, 22 Jun 2015 22:15:40 GMT

Hello Kevin,

In this case I would like to recommend the following documentation in order to improve your application:

Hope this material will be useful for you.

Have an excellent day :smileyhappy:

David Diaz