I've done a number of projects with Kinetis MCUs, but I'm having real trouble with a K22 bring-up. All boards show a high-current path from VDD to VSS as soon as VDD hits 0.5V. I've triple-checked schematic pin-out (and PCB) against the datasheet pin out. There are no parts on the board apart from decoupling capacitors and a couple of pull-up /down resistors.
The only pins tied to GND (apart from VSS, VSSA) are VREFL the dedicated ADC0_DMx pins.
My questions are:
1) Can anyone point me to a reference schematic for the K22 in a LQFP144?
2) I've no-connected COUT33, VREGIN, VBAT, USB0DP/DM. Are there any special considerations on these or any other pins at power-up?
Any help appreciated.