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.
Hi Rini Patel
What voltage level (logic level) do you have in J1-3, J1-4?
I tried to reproduce your issue, I connected J2-GND and J1-3, J1-4 to 3.3 V, with the board off. Then I connected SDA MICRO USB with j20 shorted and j18 open. But I could not see your issue, my board power on correctly (without entry in BOOTLOADER mode).
Could you try with the jumper configuration that I mentioned to see if the problem still is happened?
Regards
Jorge Alcala