TDA4VM: Power modes offered by TDA4

Manish,

Currently no low power modes are supported in the SDK. Are you interested in the hardware support?

- Keerthy

Hi Keerthy,

I would like to control the System modes , start-up, wake-up, sleep and shutdown and may be a Error Mode. Any info will be appreciated.

Regards

Manish

Hi Keerthy,

Sprius4a document page 36 : We tried to switch it to S2R mode and it didn't work. So that means what you said above also refers to S2R state in PMIC ?

Can you please tell me what steps i need to follow to bring EVM to Standby mode from running and what will be my observations ? Address and Values to be written is my expectation in this answer. 

Thank you and regards

Manish

Hi Keerthy,

PMIC is a seperate chip and I don't understand what it has to do with SDK like you said : In SDK(software) no low power mode is supported as of today.

It should only be the Interface node that shall be included in device tree which in this case is I2C and over I2C it shall work like it is given in sprius4a page 36 . Can you please try it on your side or connect to someone form power supply control team ?

Regards

Manish

Manish,

I fail to understand how PMIC can alone transition to low power mode.
The SoC(J7) should initiate the process. So the software the needs to
handle the low power mode transition is not yet part of SDK.

Hope i am clear now.

What is the document when you say Sprius4a . Can you post the full link?

Regards,
Keerthy

Hi Keerthy,

The document is Technical specification of EVM : https://www.ti.com/lit/ug/spruis4a/spruis4a.pdf?ts=1594973476080&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fdocs%252Funiversalsearch.tsp%253FsearchTerm%253Dtda4%2Bevm%2Bguide

I have also attached the screenshot form this document which explains using I2C to switch to S2R state which should actually bring all the processors to sleep and keep only the RAM active waiting for an event to take back to active state.

Can you please confirm it with the Hardware Team on your side if we are missing something to bring the EVM to S2R state.I still don't get apart from sending a I2C request from Linux what extra code in the SDK is needed to do the state change. Did you mean the code to switch off the processor is needed in SDK ?

Regards

Manish

Hi Keerthy,

Yes you are clear for me from start. I was just not clear with the sequence that is needed from Software side. 

Regards

Manish