T2080 Power Sequence VDD and SVDD

[KLN]

Hi Team,

We are using T2080 in our design, We have few queries regards to Power sequence,

Are there any power sequence /timing requirement between VDD Core Voltage and Serdes Voltage?

That is, VDD and SVDD,XVDD

The datasheet doesn't recommend any sequence between these,

In our design, we have followed this way,

1) VDD Core

2) VDD 1V8 (OVDD,DVDD,CVDD)

3) VCC 1V35 (G1VDD DDR and XVDD)

4) VCC 1V0 (SVDD)

Each ramp up timing is within 5-10ms i.e., With respect to each rail there is a delay of 5-10ms

Is this acceptable for T2080.

Or Is there a requirement for VDD and SVDD and XVDD Ramp up timing? 

Thanks

[yipingwang]

The sequence looks good.
The USB supplies are not listed, is USB not being used?

[yipingwang]

Please refer to the section "3.2 Power sequencing" in the attached QorIQ T2080 Data Sheet.

[KLN]

Hi @yipingwang 

In 3.2 Power sequencing" in the attached QorIQ T2080 Data Sheet, There is no sequence mentioned.

Please check once. Only for USB Supplies, Sequence is mentioned.

Bring up VDD, SnVDD, USB_SVDD, VDD_LP, USB_HVDD, LVDD, DVDD, CVDD,
USB_OVDD, OVDD, TH_VDD, AVDD (cores, platform, DDR), G1VDD, XnVDD, and
AVDD_ SDn_PLLn.

[pintuji]

Hello @KLN,

The T2080 processor does not have a strict power sequence requirement between VDD (core voltage) and SVDD (SerDes voltage). The same applies to XVDD. The datasheet does not specify a sequence because the processor is designed to accommodate a variety of power-up scenarios.

However, it is important to ensure that the ramp-up time for each power rail is within the specified limits. The ramp-up time you mentioned (5-10ms) is within the acceptable range for the T2080.

It is also important to ensure that the voltage levels for each power rail are within the specified limits. Overvoltage or undervoltage conditions can cause the processor to malfunction or even damage it.

Here is a link to the T2080 datasheet for your reference: T2080 Datasheet

And here is a link to a community post that discusses power sequencing for the T2080: T2080 Power Sequencing

Please let me know if you have any other questions.

[KLN]

Hi pintuji

Thanks for your reply.

T2080: T2080 Power Sequencing Link is not working, Please attach the correct link.