UCD90124A: Power on/off sequence not work well

Akihisa Tamazaki

Part Number: UCD90124A

Hello team,

My customer have adjusted some settings of UCD90124A and now the power-on sequence seems working.

I would like to implement the power-off sequence and set the rails to operate based on the command to turn on/off which allows soft off feature.

By trying the SMBus/I2C debug tool in the Fushion, I got the below result:

1. Setting the rails to react to OPERATION command, and program the design to the PMIC device.

/resized-image/__size/1542x331/__key/communityserver-discussions-components-files/196/38562.jpg

2. Use the debug tool to send the I2C write to get the device turns on, write 01 80h based on the register bit.

/resized-image/__size/914x591/__key/communityserver-discussions-components-files/196/31460.jpg

3. The SMBus/I2C debug tool writes and reads the register 01h, showing ACK. However, the PMIC rails are not turned on. Could you advise what I might be missing?

/resized-image/__size/1006x900/__key/communityserver-discussions-components-files/196/47562.jpg

Your advice is appreciated.

Best Regards,
Akihisa Tamazaki

over 3 years ago

0 yihe over 3 years ago

TI__Guru 66920 points

Please share your project file so that we can further help.

Regards

Yihe

0 Akihisa Tamazaki over 3 years ago in reply to yihe

TI__Genius 12570 points

Yihe-san,

Thank you for your reply.

The project file is below. Please see them.

/cfs-file/__key/communityserver-discussions-components-files/196/PMIC_5F00_LDA_5F00_Baltic_5F00_20221019.tifsp

/cfs-file/__key/communityserver-discussions-components-files/196/UCD90124A-_4000_-PMBus-Address-52d-Project.xml

Would you please advise?

Best Regards,
Akihisa Tamazaki

+1 yihe over 3 years ago in reply to Akihisa Tamazaki

TI__Guru 66920 points

OPERATION is a page-based command. you have to select the target page(rail) first via the PAGE_COMMAND(0x00).

For example: to turn on rail #2, write 0x00 01 followed by write 0x01 0x80.

Moreover, please ensure that the sequencing on dependencies are met so that rails can be ON after operation command.

Regards

Yihe

0 Akihisa Tamazaki over 3 years ago in reply to yihe

TI__Genius 12570 points

Yihe-san,

Thank you for your advice.
I will share the info to the customer. The customer would be able to control UCD90124A.
If the customer has additional questions, I will post another E2E thread.

Thanks for your support.

Best Regards,
Akihisa Tamazaki

0 yihe over 3 years ago in reply to Akihisa Tamazaki

TI__Guru 66920 points

Thank you for the reply and I will close this.

Regards

Yihe

0 Akihisa Tamazaki over 3 years ago in reply to yihe

TI__Genius 12570 points

Yihe-san

Thank you very much for your support. The customer has followed the suggestion and the operation command is working. He commented that the power sequencing values also quite match!

/resized-image/__size/1001x939/__key/communityserver-discussions-components-files/196/6038.a.jpg

Thank you for your support. But he has some question. I will post it to another E2E thread.

Best Regards,
Akihisa Tamazaki

0 yihe over 3 years ago in reply to Akihisa Tamazaki

TI__Guru 66920 points

Thank you. I will close this ticket.

Regards

Yihe

Power management

Power management forum

UCD90124A: Power on/off sequence not work well