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FRDM-K66 back drive protection

Question asked by Rini Patel on Oct 3, 2016
Latest reply on Nov 10, 2016 by Rini Patel

Hello,

 

Why there is no back drive protection (Schottky diode) for P3V3_VREG in FRDM-K66F?

 

 

When board power supply (in my case P5V_SDA_PSW) is OFF, and external GPIOs are attached to Arduino headers (J1-3, J1-4, J2-GND), I'm getting negative current through jumper pins J20 and J18. And after this when board is power cycled, it goes directly in bootloader mode.

 

Could this be because of the absence of Schottky across J19? What could be the get around for this issue?

 

Thanks.

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