OMAPL-138: Power up for flashing

Arya Ba

Hi All,

We are working on a design with the OMAPL-138 and had a question regarding power up. In our application we are using the OMAPL-138 along with a flash chip for boot. Now, in order to program the flash chip for production we need to power the chip externally. Our question is,

would it be harmful to the OMAP if we were to hold it in reset while only providing the 3v3 on the power bus ( for programming the flash chip externally) ?

Thanks,

Arya B.

over 12 years ago

0 Arya Ba over 12 years ago

Intellectual 690 points

If anyone could answer this we would appreciate it.

Thanks,

Arya B.

0 Antony Samsunil over 12 years ago in reply to Arya Ba

TI__Expert 4760 points

Hi Arya,

Sorry for getting it you late on this query.

This should not harm the device by feeding only 3.3V alone and more over the RESET is held active, once you done with the programming I hope you will do the proper power on reset, by the time you should follow the power on sequence provided in the datasheet.

There is no specific required voltage ramp rate for any of the supplies as long as the LVCMOS supplies

operated at 3.3V (DVDD3318_A, DVDD3318_B, or DVDD3318_C) never exceed the STATIC 1.8V supplies by more than 2 volts.

RESET must be maintained active until all power supplies have reached their nominal values.

Regards

Antony

--------------------------------------------------------------------------------------------------------
Please click the Verify Answer button on this post if it answers your question.
--------------------------------------------------------------------------------------------------------

0 Arya Ba over 12 years ago in reply to Antony Samsunil

Intellectual 690 points

Hi Antony,

Thank you very much for the response, which answers all of our concerns.

Thanks,

Arya B.

Processors

Processors forum

OMAPL-138: Power up for flashing