Locking Issue for the IC MK60DN512VLQ10

leninprabhakar · ‎03-13-2016

Hi Sir,

We are using MK60DN512VLQ10. When we do assembly process in our customized boards for the IC, for the first time if we download the code if it gets downloaded then any number of times we can erase or download the code. But for the first time problem comes in downloading it says that kinetis device is locked, target download has been failed. Then if we try for any number of times we can't download the code to our boards. Again we have to remove the IC from our board and replace with new one. Its a big process to remove the IC and solder with new one. Boards may be get damaged. Now we are in a production stage so we want the ICs in bulk quantity. Can you please resolve the issue. Tell us exactly where the problem comes from.

kerryzhou · ‎03-14-2016

Hi Lenin,

Normally, the first time download is locked problem is caused by the hardware.

There has some points you need to take case:

1. Schematic desgin

RESET_b pin, should have 4.7K to 10K pullup resistor, and have 0.1uf capactor to ground

NMI, should have the 4.7K to 10K pullup resistor

SWD_DIO should have 4.7K to 10K pullup resistor

2. chip solider tempture, the MCU datasheet have the description, the max solider temperature is 260°C, so you must control the solider tempture. Besides, if you solder it by the hand, you can't solder the pin in long time, when solid the pin, the time should as short as possible.

3. power on sequence

If the reset pin is power on before than the VDD, it may caused the chip locked, and it normally very difficult to unlock.

So you should check your programmer or debugger's power on sequence, to be safe, you can don't connect the reset pin to the programmer or the debugger.

4. debug interface link can't be too long, some people use 40-50cm debuger wire, it caused the chip secure or unstable.

5. use the Genuine debugger or progammer.

6. when do debug, take case the wire connect sequence

Power on:

1), power off the chip

2) connect the debugger to your SWD or JTAG interface

3) power on the chip

4) do code download

Power off

1) power off the chip

2) disconnec the debugger

Don't do the hot plugin

7. make sure your board power is stable

Please check the above points.

Wish it helps you, if you still have question, please let me know!

Have a great day,
Jingjing

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leninprabhakar · ‎03-15-2016

Hello Sir,

Thanks for your reply. I'll try the sequence and come back to

you if any problem still arises.

Regards,

M Lenin Prabhakar

On Tue, Mar 15, 2016 at 12:24 PM, kerryzhou <admin@community.freescale.com>

kerryzhou · ‎03-24-2016

Hi Lenin,

Any updated information on your side?

Have a great day,

Jingjing

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