TMS320F2812: F2812 halt issue

Simen Biao

Part Number: TMS320F2812

Hi ,

My customer's F2812 halt , and cannot have any idea what reason cause.

The GPIOD6 normally should be high when reset ,but it was low during reset timing when fail situation. (GPIOD6 default input/pull up when reset )

And XCLKOUT output is 37.5MHZ normally, but XCLKOUT is 3.75MHZ when fail.

Press reset-button also cannot reset the MCU.

Does anyone can give suggestions?

thanks,

successful situation:

ch1(yellow): XRS pin , ch2(blue): 1.9V ,ch3(pink): 3.3V ,ch1(green): GPIOD6 ,

GPIOD6 is High during reset timing. And toggle well after reset.

fail situation:

ch1(yellow): XRS pin , ch2(blue): 1.9V ,ch3(pink): 3.3V ,ch1(green): GPIOD6 ,

GPIOD6 is LOW during reset timing. And always low after reset.

best regards,

Simen

over 8 years ago

0 richard chiang over 8 years ago

Prodigy 160 points

I think it's a big power sequence issue in F2812，I have a same problem in it.

0 richard chiang over 8 years ago

Prodigy 160 points

Any suggestion?

0 Cody Watkins over 8 years ago in reply to richard chiang

TI__Mastermind 42195 points

Simen,Richard,

Are you using a clock input of 30MHz? If so, it looks like the PLL may have been cleared to it's default value.

Can you remove the external input from GPIOD6 and see the the behavior continues?

Finally are you using GPIOF14 for anything? Please see number 2 in the Datasheet excerpt shown below.

Regards,
Cody

0 richard chiang over 8 years ago

Prodigy 160 points

I short my crystal input,l measure the clock out is 500K.

0 richard chiang over 8 years ago in reply to richard chiang

Prodigy 160 points

GPIOF14 floating and no PU/PD External resistance

0 Daniel Su22 over 8 years ago in reply to Cody Watkins

Prodigy 30 points

Hi Cody,
The F2812 clock input is 30MHz crystal, when F2812 is abnormal, the input frequence is normal.
GPIOD6 has no external input on it.
GPIOF14 hasn't connect to other pin (No PU/PD).

BR,
Daniel

0 Daniel Su22 over 8 years ago in reply to Cody Watkins

Prodigy 30 points

Hi Cody,
If we PD the GPIOF14, the XCLKOUT is 3.75MHz.
If we PU the GPIO14, F2812 get normal the XCLKOUT is 37.5MHz, but sometimes still has fail and XCLKOUT is 3.75MHz.

BR,
Daniel

0 Cody Watkins over 8 years ago in reply to Daniel Su22

TI__Mastermind 42195 points

Corrected figure and edited GPIO's text inline on 9/28/17.

____________________________________________________________________

Daniel,

what do you have connected to GPIO87 GPIOF4, GPIO86 GPIOF12, GPIO85 GPIOF3, and GPIO84 GPIOF2?

What values are these pins at startup?

Is there any noise on these pins during the power up?

What boot mode are you trying to use?

Regards,
Cody

0 Daniel Su22 over 8 years ago in reply to Cody Watkins

Prodigy 30 points

Hi Cody,
I can't search that you mean GPIO87, GPIO86, GPIO85, and GPIO84.
I think you describe GPIOF4, GPIOF12, GPIOF3 and GPIOF2.
When F2812 power up, the boot mode is setting in Flash mode, GPIO set as below:
GPIOF4 PU, GPIOF12 PD, GPIOF3 PU, GPIOF2 PU.
GPIO signal noise is less than 50mVp-p.

We have ever try GPIOF4 connect to GND when boot up, the XCLKOUT is 3.75MHz, and reset the XRS,
F2812 can resume to normal.(XCLKOUT is 37.5MHZ)

Does it power sequence issue? or other suggest that we can try to measure.

thanks.

BR.
Daniel

0 Cody Watkins over 8 years ago in reply to Daniel Su22

TI__Mastermind 42195 points

Daniel,

Yes you were right about which GPIOs, I accidentally copied the Boot-mode pins from another device.

Is this happening on one device or many devices?

When you power it up how often does it go to the bad state? How often does it start normally?

Regards,
Cody

0 richard chiang over 8 years ago in reply to Cody Watkins

Prodigy 160 points

If I delay the sequence of power on Core voltage after +3.3V with 40ms. It's cause error very often about 3 times have one times.

we F2812 have connector to C67 with HPI interface .

0 Cody Watkins over 8 years ago in reply to richard chiang

TI__Mastermind 42195 points

Richard,

Is this a new design?

Does this problem happen on one c2000 device or on many different devices?

Do you see this problem on multiple boards or just one?

Regards,
Cody

0 richard chiang over 8 years ago in reply to Cody Watkins

Prodigy 160 points

Any Suggestion with my TI GOD.There are two controller box was out of work in yesterday.More and more of f2812 break down in the future.

0 Cody Watkins over 7 years ago in reply to richard chiang

TI__Mastermind 42195 points

Richard,

were you able to solve this problem?

Are these newly developed? Are these returns from the field?

Regards,
Cody

0 Simen Biao over 7 years ago in reply to Cody Watkins

Expert 1875 points

Cody,

We still have no idea.
The situation randomly happens.
All fail return by end users.

best regards,
Simen

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TMS320F2812: F2812 halt issue