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DM365 Questions (power-off & drivers)

Thibault B.
Prodigy 180 points
Other Parts Discussed in Thread: TPS65530, TPS65510

Hi everyone,

I am trying to develop a custom board with a DM365... that's why i have questions !

1 - I read in the dm365 datasheet that in order to power-off the processor we have to follow the sequence (power off 3.3V then power off 1.8V and 1.35V). But, when i disconnect the power supply how does EVMDM365 power-off the DM365 ?

2 - If i want to change the ethernet PHY,  i think i have to change the driver. How do I modify drivers ? What files should I change ? Is it easy for beginners ?

Regards

PS : I am new at Da Vinci processors

  • 0
    TI__Expert 5955 points

    Hi Thibault,

    1. When you connect/disconnect the power supply of the EVMDM365, you provide/cut off the 5V supply to the supply input of DC-DC converter TPS65530. You can take a look at the TPS65530 Data sheet ( http://focus.ti.com/lit/ds/symlink/tps65530.pdf ) Figure 1 and Figure 2 on page 11and page 12. There you will find how the power supply on/off sequences work.

    2. I need to check with the sw team and get back to you on this.

    Regards,

    Tai

     

  • 0 in reply to Tai Nguyen
    Prodigy 180 points

    Hi Tai,

    1.If i cut off the 5V supply, of course XLEEP will be low, but  VOUT1 to VOUT4 wil be cut off at the same time, right ? (except if there are strong capacitors/coils)

    2. I hope you will have an answer soon !

    Thanks,

    Regards.

    Thibault

  • 0
    TI__Expert 6385 points

    Hello,

    Thibault B. said:
    2 - If i want to change the ethernet PHY,  i think i have to change the driver. How do I modify drivers ? What files should I change ? Is it easy for beginners ?

    Most of the phys can be serviced by the generic PHY code that is present in the kernel. So, you wont necessarly have to write a new driver for your PHY.

    There are some other drivers specific to some chipsets. You can find the list of PHY for which a driver is already present in the kernel here. From a Linux drivers perspective, we have only tested the drivers for the PHYs which are present on the EVM.

    Thanks,

    Sekhar.

  • 0 in reply to Thibault B.
    TI__Expert 5955 points

    Hi Thibault,

    1. You are correct, if you cut off the 5V supply, on the EVM, the battery backup (TPS65510) supplies will be cut off too, so the XSLEEP will be low. VOUT2/VOUT4 will be cut off. VOUT1/VOUT3 will be cut off next.

    2. I think Sekhar Nori had provided a response for your question. Hopefully that answered it.

    Regards,

    Tai

  • 0 in reply to Tai Nguyen
    Prodigy 180 points

    Hi,

    Thanks both of you !

    Now, i have another question about the USB power supplies (VDDA33_USB et VDDA18_USB). For my custom board, I don't need to use USB interface. Do I need to use EMI filters for the power supplies anyway ?

     

    Regards,

    Thibault

  • 0 in reply to Thibault B.
    TI__Expert 5475 points

    Hi,

    If you are not using the USB, then there is no need for it.

    Best regards, Zegeye

  • 0 in reply to Zegeye Alemu
    Prodigy 10 points

    Hi!

    It's not correct answer:

    1. You are correct, if you cut off the 5V supply, on the EVM, the battery backup (TPS65510) supplies will be cut off too, so the XSLEEP will be low. VOUT2/VOUT4 will be cut off. VOUT1/VOUT3 will be cut off next.

    Power off sequence valid only if  power present for pin PS and Ch8. If unplug main supply  - pin PS will be UNPOWERED.

    Lets discuss about pin XSLEEP:

    State 1. jumper J27 place on 1-2. Power for pin PS and Ch8  - from main plug 5V. After plug connector to J7 pin XSLEEP low and all channel in TPS65530 still off.

    Then pin XSLEEP goes High (typically by  PWCTRO1) and all channel in TPS65530 power on. Then we can make XSLEEP low or high. It's does not matter. All chanell in TPS65530 still power ON. Why? We don't have answer. Possible not correct implementation for TPS65530.

    State 2. jumper J27 place on 2-3. Power for pin PS and Ch8  - from U42. After plug connector to J7 pin XSLEEP low and all channel in TPS65530 off

    Then pin XSLEEP goes High (typically by  PWCTRO1) and all channel in TPS65530 power on. Then we can make XSLEEP low and U42 go to power off state. As result - TPS65530 not powered and all channel power off. 

    So, on EVM board not possible make correct power off sequence for DM365.

     

    Any comments and opinions are welcome.