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Some questions about DLP.17

Yu Shi
Prodigy 140 points

1.When use external pattern structured light mode(120 Hz, 8-bit Monochrome)，how AUXSYNC3 generation? and controllable? what range？
2.On DLPC100,what input image interface mode can support structured light modes(120 Hz, 8-bit Monochrome,for example)?
3.In structured light mode,what relationship between DLPC100 input image frame rate and DLP1700 display frame rate?

Thanks!

  • 0
    TI__Genius 9935 points

    Yu Shi,

    Welcome to the DLP & MEMS E2E forum.

    The questions which you are asking are answered in the App Note Using the DLP Pico 2.0 Kit for Structured Light Applications (Rev. A) (dlpa021a.PDF), which can be downloaded from http://ti.com/mems by following the link for the 0.17 HVGA chipset.

    Best regards,

    Pascal

     

  • 0 in reply to Pascal DLP
    Prodigy 140 points

    Dear Pascal:

    Thanks for your reply.

    The App Note Using the DLP Pico 2.0 Kit for Structured Light Applications (Rev. A) (dlpa021a.PDF) is base Parallel RGB888 input mode,Whether the other input mode(RGB565,BT.656) can not work?

    In dlpa021a.PDF,DLPC100 select external vertical sync source,so the input graphics have 60Hz frame rate generate 120Hz  frame rate Structured Light (120 Hz, 8-bit Monochrome mode),if the input graphics have 58.4 Hz frame rate,Whether the Structured Light is 116.8Hz?and if the input graphics have less than 50 Hz frame rate,Whether the Structured Light mode can work well?

    Best regards,

    Yu

  • 0 in reply to Yu Shi
    TI__Genius 9935 points

    Yu,

    Please also see http://www.ti.com/litv/pdf/dlpu002a (DLP Pico Chip Set v2 Programmer's Guide). See 1.3.1.3 footnote (2):Internal test patterns and the BT.656 interface use RGB888

    See also http://www.ti.com/lit/ds/symlink/dlpc100.pdf (DLPC100 data sheet) Fig. 3 Pixel Mapping. For the structured light applications, the input is interpreted according to the bit position in the RGB888 map - though the SL modes are not really RGB888.

    The timing of the structured light mode is based on a 60 Hz frame rate only. In the Programmer's Guide, see 1.3.1.18 (I2C: x1F). For a 60 Hz external input frame rate, the timings will be as shown in the Structured Light App Note (dlpa021a.pdf). If the actual input frame rate is slightly slower - say 58.4 Hz, the SL mode will work - the encompassing frame rate will be 58.4 Hz. However, the subframes will continue to run at the same rate as with the 60 Hz input. That is, there will be a slight gap at the end of the SL subframes before the next frame. All of the timing inside the Pico Kit v2 is based on an internal clock oscillator, and the SL timings are based on number of clock cycles.

    You can reduce the input frame rate even further (towards 50 Hz), but the SL subframes will continue to have the same timing as at 60 Hz, and the gap at the end of the subframes will increase to make up the timing difference between the slower input frame (between VSYNCs) and the internal clock timing for 60 Hz.

    When the 50 Hz video mode is selected, the timings are changed to match the 50 Hz rate. However, the SL modes are only 60 Hz timings.

    Best regards,

    Pascal

  • 0 in reply to Pascal DLP
    Prodigy 140 points

    Dear Pascal:

    Thanks for your support!

    Best regards!

    Yu