DSP TMS320F28069 hang in power off-on condition

Hi Amtech,

Just now I checked with my F28069 control stick that is interfaced with a serial LCD. I toggled the power more than 50 times and every time it worked, no issues!

Here are few questions I would like to ask:

Is it a custom board or dev kit ? Also, if custom board how reliable is the power supply ?

Regards,

Gautam

Dear Gautam,

Thank you for your reply.

I am using my own board. not any dev kit. and i put a snap of my DSP 3.3V supply in my post. Also i observed this problem in very rare case. If i try with 20 time i face 1 time.

From TMS320F28069 datasheet DSP have require min 2.97 supply. and in my board power off condition 3.3V ramp down. at that instant if i power on may be in that condition DSP gone to hang.

I have question, why this type of problem occurred even POR and BOR in built in this device.

This seems like a hardware issue.

Check this link out: http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/85888.aspx

Regards,

Gautam

Thank you

Thread given by you is related F28335 where external TPS IC required.

Still facing problem.

Hi Amtech,

Sorry for not replying to your previous post, I just missed it. Anyways, please try this: Load the "flash_f28069" project (available in controlSuite) to your custom board. Insert only a pwm routine in that code and check with the power on/off.

Let me know what you observe.

Regards,

Gautam

Dear Gautam,

Thank you for your reply.

I will check your comment and will give you feedback.