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Hi Yordan-san
Hi Yokota,
If this understanding is correct, can I start up them at same time?
The power-up sequence is given in Section 5.9.1.1Power-UpSequence, Figure 5-3. Power-Up Sequencing:
DVDD33, DVDD33_USB start first. Then on Figure 5-3 you can see that DVDD18, AVDDA_DDRPLL, AVDDA_DSSPLL,AVDDA_MAINPLL, AVDDA_NSSPLL,AVDDA_UARTPLL, AVDDA_ICSSPLL,AVDDA_ARMPLL, DVDD_DDRDLL, and VDDAHV, DVDD_DDR, and CVDD, CVDD1 start at the same time.
Power down sequence is the reverse order of the power up.
Best Regards,
Yordan
Hi,
I apologize but I am kind of confused. The Power-up sequence is pretty straight forward:
Assert POR.
First you start DVDD33, DVDD3_USB.
Then you start DVDD18, AVDDA_DDRPLL, AVDDA_DSSPLL,AVDDA_MAINPLL, AVDDA_NSSPLL,AVDDA_UARTPLL, AVDDA_ICSSPLL,AVDDA_ARMPLL, DVDD_DDRDLL, and VDDAHV, DVDD_DDR, and CVDD, CVDD1.
Exactly the same thing is depicted on the screenshot above.
Best Regards,
Yordan
Hi Yordan,
Yokota-san is my colleague. Please let us confirm the power up sequence.
You mentioned "Then you start DVDD18, AVDDA_DDRPLL, AVDDA_DSSPLL,AVDDA_MAINPLL, AVDDA_NSSPLL,AVDDA_UARTPLL, AVDDA_ICSSPLL,AVDDA_ARMPLL, DVDD_DDRDLL, and VDDAHV, DVDD_DDR, and CVDD, CVDD1."
At this point, I believe there is no exact power up sequence requirement on these power lanes because of shaded in gray in the datasheet. Is that correct, right ? Take a look at the following red circle.
Best Regards,
NK
Hi,
Sorry for the confusion.
My understanding is that they should start simultaneously, within the grey area shown in Figure 5-3 in the datasheet. They can start at the beginning or at the end of the region you point in the red circles, but I believe the power-up sequence shows that CVDD, CVDD1, DVDD_DDR and DVDD18 (along with all other listed voltages in the DVDD18 rail) start simultaneously.
Also, as Mukul noted, you can refer to the K2G ICE board
Best Regards,
Yordan
Hi Yordan-san
66AK2G12 power up sequence.pdf
Hi Yokota-san,
The power sequencing diagram is not meant to imply that all supplies must turn on simultaneously. It is only specifying that 3.3V must be applied first and the rest of the supplies can be applied in any order. It also implies that the all of the supplies except 3.3V may turn off in any order as well.
Regards, Bill