DRA821U: Question on DRA821 wake-up and IO retention

Yong Zhang

Genius 16641 points

Part Number: DRA821U
Other Parts Discussed in Thread: DRA821

hi expert.

Is there any description for IO retention that can share to me? I found below words in TRM, but I suspect it is not right one.

how many IO can be wake-up source?

are all GPIOs in WKUP domain wake-up source? For example, for DRA821U, 85 GPIOs in WKUP domain.

3.I found MCU domain CAN RX can pinmux to WKUP_GPIO. For example, ball A17 is WKUP_GPIO0_63 by default.

I think A17 is enough to support wake-up and normal working, see below draft chart. Would you please correct me if it is wrong?

But for MAIN domain CAN RX, another wake-up IO need be connected to its RX. right?

Thanks a lot!

yong

over 4 years ago

0 Vineet Roy over 4 years ago

TI__Mastermind 37435 points

Hi Yong,

What is the application you are looking for ? Based on that I can check with HW team.

Regards

Vineet

0 Yong Zhang over 4 years ago in reply to Vineet Roy

TI__Genius 16641 points

hi Vineet.

Customer try to prepare schematic, they need know which GPIO can be used as wakeup IO. this is not about special application. May i ask you help to guide how to identify the wakeup IOs?

thank you!

yong

0 Yong Zhang over 4 years ago in reply to Yong Zhang

TI__Genius 16641 points

Dear Vineet.

Customer ask us which GPIO can be wakeup IO in DRA821. They need this information to use PINMUX tool to check if DRA821 has enough PINs to support their needs. thank you!

yong

0 Vineet Roy over 4 years ago in reply to Yong Zhang

TI__Mastermind 37435 points

Hi Yong,

Sorry for the delay, I have notified the HW expert to check on wakeup GPIO pins

Regards

Vineet

0 Robert Eschler over 4 years ago in reply to Vineet Roy

TI__Guru 51695 points

If its IO retention in the MCU domain - wakeup IO are on the VDDSHV0_MCU domain. If its IO retention in the MAIN domain - wakeup IO are on the VDDSHV2 domain.

0 Yong Zhang over 4 years ago in reply to Robert Eschler

TI__Genius 16641 points

Dear Robert.

Thank for your reply!

I am so sorry that I still need ask another question, as there is no description in DRA821U DM about IO retention.

one more question, for DRA821, which domain does IO retention exist on?

thank you!

yong

0 Robert Eschler over 4 years ago in reply to Yong Zhang

TI__Guru 51695 points

I previously stated the IO domains supporting retention for MCU and for Main domains. You can use either one or both.

0 Yong Zhang over 4 years ago in reply to Robert Eschler

TI__Genius 16641 points

Dear Rovert.

clear. thank you so much!

yong

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DRA821U: Question on DRA821 wake-up and IO retention