• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 100 subscribers
  • Views 406 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AM4376: Power-off sequence for discrete power

shigehiro tsuda
Mastermind 9490 points
Part Number: AM4376

Hi,

Our customer is trying to configure a discrete power supply with reference to the following reference design.
www.ti.com/.../slvuab1a.pdf

The power-off sequence is the opposite of the power-on sequence, as described in the 5.13.1.3 Power-Down Sequencing of AM437x datasheet.
However, this reference design does not seem to be so when referenced to the following measurement results.
Is there any problem with this reference design?

Figure 5. Power-On Sequence for AM437x


Figure 8. Power-Off Sequence with All Power Supply Rails



Also, they are trying to supply OPP Nitro 1.325V to VDD_MPU from startup.
Is there any problem?

Best Regards,
Shigehiro Tsuda

  • 0
    TI__Guru**** 393215 points

    Hi,

    shigehiro tsuda said:
    Is there any problem with this reference design?

    From www.ti.com/.../slvuab1a.pdf :

    "Figure 7 shows the power-off sequence of the voltage rails with the PORZn signal. When the PORZn signal goes low, the processor enters the reset state and all rails are safe to turn off as their input voltage drops."

    shigehiro tsuda said:
    Also, they are trying to supply OPP Nitro 1.325V to VDD_MPU from startup. Is there any problem?

    No.