DLP3010EVM-LC: Hardware Triggering DLP3010EVM-LC using GUI application in internal pattern projection mode

Hi Basith,

I've assigned this to a team member who is familiar with this EVM. I do not know much about it, but the user's guide I found from the product page states that you must install a jumper (not included in the EVM kitting list). If you do not have a shunt jumper that is commonly used for these purposes, a socket-to-socket dupont wire can often be used instead.

Please allow my team member some additional time to respond (maybe next week) because the United States has a national holiday on July 4th, and some have taken time off already.

Regards,
Michael Ly

Hi Michael,

I have already attached the jumpers between pin-2 and pin-3 of J11 connector and similarly between pin-2 and pin-3 of J3 connector as mentioned in the user guide. I am attaching the screenshot for better clarity.

Thanks for replying and Happy Fourth of July! Wishing you a joyful Independence Day.

Regards,

Basith

Hi Abdul,

Thanks for the update on this.  I think our expert should be back in the office today.

Also, thank you for the good wishes!

Regards,
Michael Ly

Hello Aaron,

I have enabled 'Pattern Ready' and set it to 'Active High' and monitored it in oscilloscope in Free Running Mode (Trigger-IN disabled) and Trigger In Mode (Trigger-IN enabled and set to Active High). The output images are attached below.

1. Free Running Mode: Yellow line represent Pattern Ready signal (Pin-3) and Blue line represent Trigger OUT 2 signal (Pin-4) from projector 

From the first image, Is there any issue with the Trigger Out pulse because the Pattern Ready signal goes low before the last patterns trigger out signal

2. Trigger In Mode: Yellow line represent Pattern Ready signal (Pin-3) and Blue line represent Trigger In signal supplied to (Pin-5) of the projector  

As from the second image, the projector is ready to receive trigger pulses, as the Pattern Ready signal is High. Even after supplying Trigger pulses of voltage 3.3V the projector does not project patterns. I generated the trigger pulses manually on a button click and also using function generator.

What changes should I have to make in the pattern timing?

Regards,

Basith

Hello Basith,

#1 Free-running mode: Firstly, when in free-running mode there is no 'Pattern Ready.' The function of Internal Pattern is not utilized. Secondly, Pattern Ready and Trigger Out 2 are mutually exclusive outputs. What I mean is, Pattern Ready simply indicates that the controller is ready to accept an external trigger signal while Trigger Out 2 indicates the individual pattern trigger and is configured active (high/low) during the pattern exposure.

#2 Trigger-In mode: From your second initial image, when you had pattern ready still disabled, the selection is 'Active Low' and if the Pattern Ready is 'High' this would indicate it is not ready to accept a trigger in signal. According to your photo, you have at least 3 pattern sets defined as 25ms (Pre-Exposure), 100ms (Exposure) and 6ms (Post-Exposure) + 3ms (Load time), this would total to 134ms or ~7.5Hz.

I cannot be sure of what kind of patterns you are loading in but you should reference the latest release notes of the DLPC3478 software you are running (should be v9.2) through the Firmware Selector Tool. You should make sure you are within a defined exposure timing type/Exposure Time Range combination.

You will also see at the bottom of the table that "Longer exposure times will operate with decreased timing accuracy and behavior is not guaranteed." Additionally, it is noted that "an additional variable delay of ~3000 us at the beginning of every pattern set" as I've mentioned before the 3ms buffer for 'Load Time.'

Best,

Aaron

Hello Aaron,

Please find attached the document explaining our current setup including wiring and timing details of pattern.

I tried with another projector of the same model and made changes in pattern exposure time and the trigger pulse frequency and duty cycle. Found out the projected patterns are distorted. 

Need help with setting up pre, post and exposure time for the pattern and the required frequency and duty cycle of the trigger pulse.

Wiring connections done for Hardware triggering TI DLP 3010 EVM.pdf

Regards,

Basith

Abdul,

We are sorry, but the forums were down for maintenance on Friday (7-11).  Aaron is on holiday for the next couple of days.

Please let me look at what you have supplied and get back to you tomorrow.

Fizix

Hey Basith,

Your questions:

1. Expected voltage range for trigger input pulse - DLPC3478 pin N6 (3DR) is any voltage of 1.8V, 2.5V, or 3.3V. Within the DLPC3478 Datasheet, Table 5-10: I/O Type Subscript Definition shows that the supply reference is Vcc_INTF for this selected pins' I/O subscript (11). If you are following our EVM this is set to 3.3V.

2. You should utilize a time that is within the same Exposure time sequence range.

3. I've checked on my EVM and the timings that you have are good timings. I just didn't utilize the Trigger In function.

Best,

Aaron

Hello Product Application team,

Subject: Request for Guidance on Return/Replacement – DLP3010-LC EVM

Further to our earlier discussions, we conducted testing of the projector in internal trigger mode, but it failed to operate as expected. I then tested the same setup with our first purchased DLP3010-LC EVM, and it worked perfectly. This confirms that the issue lies with the projector unit itself.

In addition, we found another issue with the same light engine: when streaming any content via HDMI, the projector displays a noticeable green tint across the image.

Kindly advise on the process for returning or replacing this unit. The purchase was made approximately four months ago, and I have attached the invoice for your reference.

Invoice.pdf

Best Regards

Abdul Basith

CDAC Trivandrum