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Original question:

DLP3010: DLPC3478+DLPA2005+DLP3010 ，after Flash ，DLPC3478 no work,SPIO_CLK is none

DLPA2005: V6V Rail Behaviour

Yai Sagolsem
Prodigy 60 points
Part Number: DLPA2005
Other Parts Discussed in Thread: DLPC3420

Tool/software:

Hi, I just wanted to ask if the V6V rail is meant to power up as soon as Proj_On or DMD_EN is asserted as I do not see any voltage on that pin and I believe it is causing INTZ to be tripped.

Thanks.

  • 0
    TI__Genius 11565 points

    Hello user,

    Please see below description in the DLPA2005 Datasheet. If you also see INTZ signal is pulled low, then there is interrupt/fault occurred. You may need to double check the power sequence, and you can refer to Figure 3/Figure 4 in the datasheet. 

    Please let us know if you have further problem. 

    Regards,

    Lori 

  • 0 in reply to Lori Wang
    Prodigy 60 points

    Hi Lori,

    Unfortunately the datasheet doesn't seem to give any information about the V6V rail which is why I am asking.  The DLPA2005 pulling INTZ to ground before the DLPC3420 is able to initialise and reset HOST_IRQ so I am unable to use the I2C interface to access the DLPA through DLPC to find what bit has tripped. 

    This behaviour is with the Boot Diagnositcs firmware and INTZ (DMD_PARK_Z) is being pulled down immediately after the PMIC initialisation test succeeds (I believe this is where DMD_EN is asserted). This prevents the system from continuing the boot process and the serial terminal stops printing after PAD initilisation PASS.

    Out of all the rails, V6V is the only one showing absolutely no activity, although I am unable to determine due to the datasheet whether this is intentional or not as I believe that the V6V rail is likely for the gate drivers for VLED which of course is not being used here yet which could explain why V6V is 0V.

    Futher help would be greatly appreciated.

    Thanks,

    Yai.

  • +1 in reply to Yai Sagolsem
    TI__Genius 11565 points

    Hello Yai,

    V6V signal should be typical as 6.25V in normal operation. There might be a fault/interrupt if you see INTZ is pulled low.

    You may want to double check the DLPA2005 power up sequence and connections on your board. 

    Regards,

    Lori