UCD90120A: set up

Hailiang Zhang

Part Number: UCD90120A
Other Parts Discussed in Thread: UCD90120

Hi Team，

The customer wants to control the UCD90120 through the PMBUS command to achieve all power rail power off functions. Can you suggest how to implement all power rail power off?
In addition, what is the specific method for software reset?

Regards,

over 2 years ago

0 yihe over 2 years ago

TI__Guru 66310 points

we do not recommend soft-reset since it reset the devices and all IO are off immediately.

The only way to control power off via commas is to

1. configure all rails’ on_off_config to OPERATION

2 issue operation command to turn on or off the rail

Regards

Yihe

0 Hailiang Zhang over 2 years ago in reply to yihe

TI__Genius 11160 points

Hi Yihe,

Thanks for your comment. Could you pls help check the method?

1，Configure all rails’ on_off_config to OPERATION as shown in the figure below.

2，Send PMBus Operation command

I have two questions here.

1, Could you pls share the PMBus specification?

2，In addition to PMBus control, a hardware-based method of turn off all rails at the same time is PSRS?

Regards,
Hailiang

0 yihe over 2 years ago in reply to Hailiang Zhang

TI__Guru 66310 points

1. Please Google PMBUS spec 1.2 and Part 2 to see all the commands

2. Yes, PSRS is another way to control via GPIO signals.

Regards

Yihe

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UCD90120A: set up