Hi,
I made a custom PCB design that uses Teensy 3.2's core components. I'm using the mk20dx256vlh7 chip paired with MKL04 pre-programmed chip. I bought the MKL04 chips from PJRC Store and sent it to the PCB factory. Today I received my PCBs and was disappointed to realize all 5 of them do not work. When I try to upload the blink code, the board does not respond. A quick oscilloscope prob on the RESET_B line shows constant 0V all the time; there are no short pulses from the watchdog timer resetting the MK20, even when I press PROG button. Where could be the problem? There is power going to the MK20 & MKL04 chips
Please help!
I made a custom PCB design that uses Teensy 3.2's core components. I'm using the mk20dx256vlh7 chip paired with MKL04 pre-programmed chip. I bought the MKL04 chips from PJRC Store and sent it to the PCB factory. Today I received my PCBs and was disappointed to realize all 5 of them do not work. When I try to upload the blink code, the board does not respond. A quick oscilloscope prob on the RESET_B line shows constant 0V all the time; there are no short pulses from the watchdog timer resetting the MK20, even when I press PROG button. Where could be the problem? There is power going to the MK20 & MKL04 chips
Please help!