XIO2001: Power down sequence

Oba

Genius 17325 points

Part Number: XIO2001

Hello

I found the below thread for power up sequence.

https://e2e.ti.com/support/interface/digital_interface/f/130/p/670163/2466816

But I also would like to know power down sequence.
The datasheet requires PCIR power down before 1.5V/3.3V power down.

1.
How long doe it requires between PCIR power down and 1.5V/3.3V power down?
Also what voltage can be thought as the voltage that PCIR enough powered down?

2. Regarding 1.5V and 3.V power down, is any special power down sequence required like simultaneous power down?

Regards,
Oba

over 7 years ago

0 Ikechukwu Anyiam over 7 years ago

TI__Mastermind 35130 points

Hi Oba,

We'll look into this and get back to you soon.

Regards,
I.K.

0 Ikechukwu Anyiam over 7 years ago in reply to Ikechukwu Anyiam

TI__Mastermind 35130 points

Hi Oba,

According to the figure in the datasheet it looks like PCIR and 1.5V/3.3V power down simultaneously. I'm not quite sure what voltage can be thought as "enough powered down". Ideally you would get it close to 0V. Is this not possible in your system?

Regards,
I.K.

0 Oba over 7 years ago in reply to Ikechukwu Anyiam

TI__Genius 17325 points

Hello I.K.

I'm sorry for my late response. I didn't notice your answer till today.
Thanks for your support.

From the below post, there is no special requirement for power-up sequence.
https://e2e.ti.com/support/interface/digital_interface/f/130/p/670163/2466816

So I guess power-down also doesn't require any special sequence. Is simultaneous power down really required?
Could you tell me the reason?

Regards,
Satoshi Obata

0 Ikechukwu Anyiam over 7 years ago in reply to Oba

TI__Mastermind 35130 points

Hi Oba,

Sorry for the delay. I agree with your assessment. Since there isn't a special requirement for the power-up sequence I don't believe there is one for the power-down sequence, so simultaneous power-down shouldn't be required.

Regards,
I.K.

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XIO2001: Power down sequence