Any difference in TMS320F2810 chips?

Hi,

Yue Li2 said:

Circuits are the same and code is the same in two boards. The only difference is the chip: one's name is ended with CG-13ACHXW while the other is ended with CG-37APDGW.

Does this affect the result???

No this will not affect the result as these codes are not more than batch/lot numbers. I hope the other are not damaged as Pin68 & 69 are able to run. I hope you might've have checked the boards thoroughly, is rest of the board fine? Do you feel any issue on board that might've affected the pwm pins?

Regards,

Gautam

Hi Yue,

For reference, the part marking decoder is usually in the device errata document:

As Gautam pointed out, you can see from here that both devices are the same revision (the "CG" part means revision G) but have different lot-trace codes, which is normal.  

I also agree with Gautam: check the hardware, particularly whatever is on those pins, as well as the clocks, supply rails, and reset circuits.  

Alternately, you could carefully de-solder the parts and switch the boards they are on to see where the failure goes (does it stay with the board, or go with the part, or go away completely).

Thanks for your replies, Devin and Gautum,

I cut the traces of DSP's PWM output pins on the PCB  to make sure that these pins are NOT connected to the rest of  circuits. (Supposingly, these pins are connected to my CPLD chip).

However, still there are only two PWM output but the other 4 pins have no PWM output at all (they either have 3.3V or 0V output)....

If it is the case that for some reasons the DSP got burned or damaged, could that be the exact two PWM output pins (PIN 68 and PIN69) are fine while only the other four PWM outputs are damaged?

The same issue happened to two boards at my hand.

Thanks a lot!

Yue Li2 said:

If it is the case that for some reasons the DSP got burned or damaged, could that be the exact two PWM output pins (PIN 68 and PIN69) are fine while only the other four PWM outputs are damaged?

What is the next stage after the PWM signals?... there might be a possibility that the driver IC might've broken down (if present off course).

Regards,

Gautam

The next stage is that these PWM signals will go into an Altera CPLD chip.

Now, I have cut the traces from the DSP to the CPLD chip, which means that the PWM pins go nowhere on the board. Still, I can get the two PWM output but no other four PWM output.

That really confuses me. If the DSP chip got burnt, how come the exact four PWM channels got damaged but the other two channels are perfectly fine??

Yue Li2 said:

Now, I have cut the traces from the DSP to the CPLD chip, which means that the PWM pins go nowhere on the board. Still, I can get the two PWM output but no other four PWM output.

Very true... Now that you've already cut the traces. Do you have the recources to replace it with the new mcu?

Yue Li2 said:

That really confuses me. If the DSP chip got burnt, how come the exact four PWM channels got damaged but the other two channels are perfectly fine??

That's hard to say...

Well, I have the third board. This is the last board that I have. Before using it, I want to find out what exactly happened to the DSP chip instead of shooting in the dark...

Now, the only cause that could be is the DSP chip got burned?....

Yue Li2 said:

Now, the only cause that could be is the DSP chip got burned?....

Seems so...!