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flexbus sleep mode current

Question asked by Elizabeth Russell on Jun 30, 2017
Latest reply on Jul 4, 2017 by Hui_Ma

I am using a K65 on a target board with external NOR Flash and an LCD display connected to the flexbus. For sleep mode I am putting the processor into the LLS mode. What I experience is varying levels of sleep mode current - from a low of 0.1 mA up to 1.1 mA. I have traced this discrepancy to the flexbus signals. By disabling the data and address lines (setting the pin mux control in the Portx_PCRn registers to 0 upon entering sleep) I have almost completely eliminated the discrepancy for all 40 prototype boards tested. Has anyone else experienced this type of behavior in sleep mode?  Is there something in the design or layout that I should be looking at as well?

 

Thanks,

 

Elizabeth

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