DLP4710: How to make sure the connection between DMD and PCB

Hi Yun-Seok,

I have a few questions:

• Are you currently working with an optical module manufacturer?
• Can you please verify where you got the ASIC firmware from?
• Can you provide your schematic? Please note there are 2 options for the DMD pin mapping which have to match what is in the firmware. The DMD pin mapping options can be found in the DLPC3439 datasheet.

When the flat cable is not connected on the EVM, basically the DMD is not connected to the controller, so I'm not sure which symptoms you are mentioning.

Also the 4710 GUI has an Advanced tab that can be used to read some of the registers on the controller.

Hope this helps.

Best,

Sepeedah

Dear Sepeedah,

Yes, I'm working with an optical manufacturer.

The ASIC firmware what I'm using on my PCB is from the backup of DLPLCR4710 EVM-G2.

Yes, I can provide my schematic.

If I explain about the symptoms , it is like this.

1. Without DMD

When I pushed the  On/Off button "SW21",  the LED's of "D34" and "D33" were not turned on. And the LED of "D57" was turned off for a while and turned on again.

(D34: M_HOST_IRQ, D33:S_HOST_IRQ, D57:PARKZ )

2. With DMD

When I pushed the  On/Off button "SW21",  the LED's of "D34" and "D33" were turned on and  the LED of "D57" was off.

 

In my knowledge , if there is no power on DMD, I can't read any information at the Advanced tab of GUI.

 

The signal, "PARKZ", comes from DLPA3005.

In my case, the signal of  "PARKZ".is never turned off. That means, there is a fault on DPLA3005. Am I right?

 

That is the reason why I need to communicate with the DLPA3005.

 

Please, show me a good direction.

 

 

Regards

Yun-Seok Cho

 

 4710G2.zip

 

 

 

 

Dear Sepeedah,

 

You are right!

There was a mismatched pin mapping on my schematic.

I attached a modifed schematic file.

Could you please check that out?

4710EVM_modification.zip

Regards

Yun-Seok Cho

Dear Sepeedah,

I did correct the mapping between DLP4710 and DLPC3439 as like the attached shematic file.

And I made a new PCB and did test it.

But there was nothing changed.

 

DMD is connected  throuhg an interposer to pads on PCB.

I want to have a confidence that DMD is connected to PCB very well.

Is there any way how to make sure the connection between DMD and PCB.

I mean, I'm asking you if there is a way to communicate with DLPC3439.

 

You mentioned about two kind of "ASIC firmware" before.

Do I need to test both of them?

 

Regards

Yun-Seok Cho

4710EVM_G2.pdf

Hello Yun-Seok,

Are you still seeing D34 and D33 off? Those two LEDs are connected to HOST_IRQ of the slave and master controllers. This signal goes low when initialization of the controller is complete. If HOST_IRQ does not go low, it may be an indication that the controller is not initialized. If the controller is not initialized then it won't be possible to send commands to the controller and read the registers.  Please refer to the DLPC3439 datasheet  to better understand the sequencing of the signals.

Regarding the ASIC FW, if you're using the pin mapping on the EVM schematic, and FW backed up from the EVM, that should be fine and they match.

We will need to probe some signals on the board to understand the fault. However, before that, could you please double check the connections on the board to make sure you don't have any disconnection problem or there isn't any kind of alignment issue etc? Also, are you using the same power supply as the EVM?

After that I would recommend the following steps:

1. Check that you have a stable 3.3V, 1.8V, and 1.1V voltage rail on the board. Please acquire simultaneous scope shots of these rails along with INT_Z when you attempt to turn on the projector. 

2. Please acquire simultaneous scope shot of these signals as well when attempting to turn on projector:

• HOST_IRQ, INT_Z, and PROJ_ON 
• PROJ_ON, VBIAS, VOFS, VRST.  The timing of these signals should follow the data mentioned in the TIDA-01226 reference design on P.9.

Thanks,

Sepeedah

Dear Sepeedah,

Thanks for your recommendation!

 

I checked and monitored the below signals  while pushing the button of SW21.

1. 3.3V, 1.8V and 1.1V 

-> It looks fine.

2. PROJ_ON, M_HOST_IRQ, S_HOST_IRQ, INT_Z(PARKZ)

-> M_HOST_IRQ and S_HOST_IRQ were always 'HIGH".

3. PROJ_ON, VBIAS, VOFS, VRST

-> There was no singal on VBIAS, VOFS and VRST.

4. SPI signal  bewteen DLPA3005 and DLPC3439

->  I can't see any signal and clock.

5. VCC_INTF

-> There was no signal .

What do you think about this problem?

According to the datasheet of DLPA3005, the internal signal of "DMD_EN" comes from DLPC3439 throgh SPI and it initiate  VBIAS,VOFS and VRST.

Does it means that DLPC3439 doesn't send any command to DLPA3005?

I'm veyr confusing about power sequence.

 

What  is the first problem between of DLPC3439 and DLPA3005?

 

Regards

Yun-Seok Cho

Yun-Seok,

I see that PROJ_ON is going low after some time. PROJ_ON is the main signal that instructs the DLPC and DLPA to turn on and initialize. In a normal case PROJ_ON should stay high if the button is only pushed once. Are you using the same type of switch for SW21 as the EVM? Basically when that switch is pushed, the MSP430 detects the rising edge and outputs a high signal which is used as PROJ_ON. If PROJ_N goes low then it will instruct to start the shut down operation. One thing that you can try is to modify the MSP430 code to always have PROJ_ON be high and see if the system works or not.

Also I have a few other questions:
- What power supply are you using?
- Can you try using the FW on the TI Website for the EVM and load that on to both the flashes? FW can be found at this page: www.ti.com/.../DLPDLCR4710EVM-G2
- Please take a scope shot of 1.1, 1.8, 3.3V, and INTZ in one capture. It may help in identifying the fault if we have more accurate timing of these signals relative to each other.

Thanks,
Sepeedah

Dear Sepeedah,

There was a DOA(Dead on arrival) part!

After replaceing with a new one, I can see normal signal like the below pictures.

When I push the button of SW21, I can see that DMD is working.

But a problem is that DMD is not kept to be ON.

When I push the button of SW21, DMD is turned on for a short time and automatically turned off .

Please, refer to the figure#4.

 

What kind of condition  makes the DMD to be truned off ?

 

I did also download another virsion of firmware from the above site and write it to flash memory.

But it was not working.

 

Regards

Yun-Seok Cho

 

Figure1.

 

Figure2.

FIgure3.

FIgure4.

Hi!

 

The DOA part was the X3 oscillator.

Figure2 is before pushing the sw21 button.

Figure3 is showing a switching time from projec off  to on.

I capture and add a scope image showing the signal of 1.1V, 1.8V , 3.3V and PARKZ.

At this experiment, I pushed the sw21 button two times

When I first push the button, there is nothing changed.
If I successively push the button, the DMD is working for a short time.

 

I also think that the DLPA3005 might got  faults.

According to the datasheet of DLPA3005, it has registers to store  fault list.

 

Is there any way to access to the registers of DLPA3005.

 

Regards

Yun-Seok Cho

 

Hello Yun-Seaok,

Did you have the LEDs hooked up when performing this test?

Best,

~Danny W

Hi!


Even I hooked the LED source, it was same.
That is, there was nothing changed before and after hooking LED.

Thanks for your quick response.

Regards
Yun-Seok Cho

Hello Yun-Seok,

Thanks for the quick reply. Interesting, it is possible the DLPA3005 was damaged when powering it up with no LEDs connected. Do the LEDs turn on at all when you power on the board? Do you have a second board or part you can try that has not been powered up without LEDs?

Also, can you still communicate with the controller when the DMD turns off?

Best,
~Danny White

Hi!

I have a second board but is as same with the first one.

In my case, the LED light source doesn't affect anything.

 

Even the DMD is off,  it is available to communicate with USB.

In this case,  the signal of PROJ_ON  and PARKZ  is still high.

 

Regards

Yun-Seok Cho

 

 

HI!

I found a problem!


That was the number of LED light source.

I have been testing with one LED light source.

I think that the DLPA3005 could treat this as a fault.


Is there any way to make the other LED disable?

I can see a button to disable LED light source on the UI window.

But I can't save it to the system.


Regards
Yun-Seok Cho

Hello Yun-Seok,

That sounds like it could be the problem. For debugging purposes can you attached all of the LEDs (even if some of them come from a different light engine)? Then power up the board.

Once the DLPA3005 sees an error it will not come up even if you disable the LEDs. That is why you are not able to see anything even after you disable the LEDs.

If this fixes the problem we can supply you with custom firmware that will run with only 1 LED connected.

Let me know your result. 

Best,
~Danny W

Hi!

After attaching all of LEDs , it is working well.

If I can choose one LED port, I would like to use "green" LED port.

Thanks for your great support!


Regards
Yun-Seok Cho

Email: yscho@finelogic.co.kr

Hello Danny!

 

I'm still waiting for your firmware.

Can I receive it within this week?

 

Regards

Yun-Seok Cho