TMS320F280049: C2000™ microcontrollers forum

Rayna Wang

Hi team,

Our customer meets an urgent issue that the hardware boards have been damaged several time, before products mass production.

They find that there is over 4mA current flow through GPIO26 pin, which connected by 100ohm resistance with triode Q607 driving circuit. In the circuit, the Q607&Q626 need open at the same time, which make circuit current large.

Customer is not sure if the GPIO over current could cause board damage, and what's the limited GPIO current value we suggest them to use.

Could you give some suggestions? Thanks!

-Rayna

over 6 years ago

0 Peter Galicki over 6 years ago

TI__Expert 8105 points

Rayna,

What is the nature of board damage that you have observed - could you give us some details?

Thanks,
PEter

0 Rayna Wang over 6 years ago in reply to Peter Galicki

TI__Expert 3680 points

Hi PEter,

Sorry for that customer didn't say much details about the nature of board damage. And they much would like to know the limit value of GPIO current, which is better for their judgement. They wonder that

1# Do you have any information about the limit current value?

2# If there is over current happened, could it cause the GPIO low level output voltage is more than 0.5V?

3# Do we have any strategy or suggestion about how to deal with the over current condition?

Sorry to push you, however this case is urgent, so could you please reply me as soon as possible, much appreciate!

Thank you very much!

-Rayna

0 Peter Galicki over 6 years ago in reply to Rayna Wang

TI__Expert 8105 points

Rayna,

THe maximum current could be in the mA range, please check the datasheet for the exact value. Operating outside the datasheet parameters is likely to damage the buffers. It is difficult to predict the behavior at that point - there are too many variables in play.

REgards,
Peter

0 Rayna Wang over 6 years ago in reply to Peter Galicki

TI__Expert 3680 points

Hi Peter,

Thanks for your reply. I have found related parameters in datasheet.

Regards,

-Rayna

0 Rayna Wang over 6 years ago in reply to Rayna Wang

TI__Expert 3680 points

Hi Peter,

Sorry to open this thread again. I have some confusion about the data in following figures.

As the 5.6 figure shown, when the GPIO output low level, the maximum current IOL is 4mA. However, in the 5.1 figure, the range of output current is from -20mA to 20mA, does this mean that the maximum GPIO output current is 20mA?

Could you tell me which limited value is suitable for the above issue, and what's the different of these two variables?

Thanks!