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Original question:

DLPC1438: Boot failure - HOST_IRQ stays high

DLPC1438: DLPC1438 after setting the PROJ_On signal to high, the HOST_IRQ signal stays high.

?? ?
Prodigy 25 points

Part Number: DLPC1438
Other Parts Discussed in Thread: DLPA3005,

Tool/software:

Hi 

I have a board with DLPC1438 and DLPA3005.The problem is that after setting the PROJ_On signal to high, the HOST_IRQ signal stays high. The DMD cable and LEDs are connected.

1.I have checked the power-up Timing signal:

   PROJ_On->VDD-1.1V、VCC18-1.8V、VCC_INTF-1.8V、VCC_FLSH are always 3.3V when SYSPWR is on.

   PARKZ is 1.8V when SYSPWR is on,and go 3.3V when PROJ_On.

   FPGA PWR go high.PLL_REFCLK 24MHZ stable.

   RESETZ is 0.5V when SYSPWR is on,and go 1.8V when PROJ_On.

   FPGA_RDY go high earlier then Host_IRQ.

   Host_IRQ stay high.

   VOFS=10V、VBIAS=18V、VRST=-14

what else singal should i check.

2.I have observe another situation.When the board is in normal temperature(about 28~30C).Host_IRQ will stay high after Proj_on.If i use heater to heat up the DLPC1438 to about 50C.Host_IRQ can go low in 2sec.Do you have any idea about this situation.

  • 0
    TI__Expert 3655 points

    Good afternoon,

    Thank you for reaching out to the E2E forum! Please let me consult with my colleague regarding your question and I will get back to you later this week. 

    Regards,

    Tristan Bottone 

  • 0 in reply to Tristan Bottone
    Prodigy 25 points

    Thank's alot.I have check some other singal.And I've found out some different performance.When the board is in normal temperature.After Proj_on,GPIO_10 do not goes high.And Host_IRQ will stay high.If I heat up the board.GPIO_10 will stay high after Proj_on.And Host_IRQ can goes low.Is it because of GPIO_10?And what is the relation between Host_IRQ and GPIO_10?

  • 0
    TI__Expert 3655 points

    Good afternoon,

    When the system is powered on the HOST_IRQ signal provides the initialization completion status of the DLPC1438 system. GPIO10 is just a generic GPIO which can either be used as an RC_Charge (output) which is intended to feed the RC charge circuit of the thermistor interface or this can be used as an optional GPIO. More information can be found from the DLPC1438 Programmer's Guide and the DLPC1438 Datasheet.

    Regards, 

    Tristan Bottone

  • 0 in reply to Tristan Bottone
    Prodigy 25 points

    I'm sorry. I have make a mistake. I mean GPIO_11,Not GPIO_10.

  • 0
    TI__Expert 3655 points

    Hello,

    The GPIO_11 pin could be used as the thermistor power enable (output) which turns on the power to the thermistor when enabled. Another option is to use the GPIO_11 pin as an optional GPIO pin. Just as a reminder, this information can be found in the DLPC1438 Datasheet under Pin Configuration and Functions.

    Also, for the power-up timing sequence, I noticed that the FPGA_RDY signal goes high earlier then HOST_IRQ, but in Figure 9-1 of the DLPC1438 Datasheet, the FPGA_RDY signal goes high after HOST_IRQ goes high. You may want to check the value of the pull-up resistor and external supply in your hardware design. The HOST_IRQ signal may go high sooner if it's pulled up to a different external supply. Additionally, 'Section 9.3 - Power-Up Initialization Sequence'  in the DLPC1438 Datasheet explains how the external pull-up resistor affects HOST_IRQ signal and how the power-up sequence is performed when powered on.

    Regards, 

    Tristan Bottone

  • 0 in reply to Tristan Bottone
    Prodigy 25 points

    the external pull-up resistor for HOST_IRQ is same as TI Reference Design 10K.

    Picture below is the power up timing i have measure.

    Is there any other singal i should check?

  • 0 in reply to ?? ?
    TI__Expert 3965 points

    Hello,

    Please expect a delay in response due to the holidays in the US. We will get back to you by 6th of January. 

    Thank you for your patience.

    Regards,
    Aishwarya