PN7462AU "Cannot halt processor" AGAIN

[mariob]

Hi,

I posted this issue already a few weeks ago. Back than I replaced the PN7462AU from the Dev Board.

Now the same error occurred again. 

I was just changing some lines of code and hit the debug button and got the following message.

It seems like the PN7462AU died again?

Please help me. Where is the Mistake? I can not change the MCU every week.

Im using:

- LPCXpresso v8.2.2 [Build 650] [2016-09-09]

- OM27462CDK Development Kit

[mariob]

Hi,

again I replaced the PN7462AU and it worked for maybe three times. After that it stoped with the same error.

It looks like I getting no support here, can anybody give me a tip where I can get support with this issue?

Its really important!

Best Regards

Mario 

[Jorge_Gonzalez]

Dear Mario,

As suggested in your support ticket and for others having a similar problem, below is a way to recover access to the PN7462 without replacing the IC:

--------------------------------------------------------------

- Plug the board to the PC via the USB port and enter primary bootloader mode (described in UM10883 and in the attached picture).

- Delete CRP_00.BIN.

- Reset the board (RST_N pushbutton).

Debug access should be recovered. Then you can find the offending code in the project.

--------------------------------------------------------------

Regards!
Jorge Gonzalez

[ivan_mihajlov]

Dear Jorge,

Thank you!! This worked just fine for me.
Maybe entering the primary bootloader mode for linux should be better supported/documented.

Best Regards,
Ivan

[mariob]

Hi,

lt looks like nobody can help me with this issue. 

Meanwhile I possibly found a reason for this fault.

The only external Part I connected to the devboard is a USB-Serial TTL converter.

I used a TTL-Converter like it is described in the Door Example "UM10957". As far as I know TTL means a high voltage level of 5V. 

Now I found on the PN7462 datasheet on page 54 table 28 input voltage for  atx_a, atx_b,... a max input level of 4.2V.

I seems that is the reason for the broken 7262.

Has anyone experience with the HSUART interface and can help?

Best Regards

Mario