Dear fellow members,
I would like to approach you with the problem related to programming or code download into Kinetis K60 throught the OSBDM JTAG interface. Last year in December we've created at our university (Brno University of Technology, Faculty of Information Technology, Brno, Czech Republic) prototype of educational kit for our students where 6pcs were available. These boards (see schematics in the attachment) were assembled with following Kinetis K60 types:
1) MK60DN512ZVMD10, mask 4N30D, batch CTCTAW1236X
2) MK60DN512ZVMD10, mask 4N30D, batch CTCTAU1234B
In case of option 1) the board worked without any problems at all but we have experienced difficulties (it wasn't possible to download any piece of code through CW 10.3 and OSBDM interface with firmware version 31.21) with option 2) used on 5 of the boards presumably due to faulty components. After removal and replacement of these 5pcs boards started to function as expected even if components with the same identification as in 2) were used.
Yesterday, we have received first 20pcs from the main production batch which should include some 550pcs but the problem with JTAG programming appeared again on all of these boards. Following component was used:
MK60DN512VMD10, mask 4ND22D, batch CTCTAA1249A
I suspect that complete delivery of these 20pcs of Kinetis MCU could be faulty as the rest of our board (with the same circuit schematics as on the prototypes) works without any problems. Would you have any suggestion how to solve this problem? Or perhaps the difficulties mentioned above may have occured due to some soldering problem, I really do not have any clue in this case.
With kind regards,