DLPC3470: dlpc3470 Splash Pattern 模式为什么会设置最大 Pattern 周期，这个最大周期能否更改？

DLPC3478 Firmware v8.0.1 Release Notes

March 14, 2022

Table of Contents

• Overview
• Supported Features
• Updates in this release
• Known Limitations
• Technical Support and Product Updates

Overview

These are the release notes for the following firmware image file:

• Firmware Version: 8.0.1
  • Embedded Software Version: 8.1.0
  • Generated from DLP Composer Version: 13.13
• DMD: DLP3010LC
• Controller: DLPC3478
• PMIC: DLPA2005

Configuration Settings

• I²C Address: 0x36
• DMD Pin Mapping: 1
• Rlim value: 39mΩ
• Light Control Sequence Database Version: 0.5.71

Supported Features

• • Light Control
    • Internal Pattern Streaming Mode: - Trigger-In/Free-running modes (Mono 1 Bit/8 Bit, RGB 1 Bit/8 Bit, Vertical + Horizontal Pattern Generation, Pattern Invert)
    • External Pattern Streaming Mode (Mono 1 Bit/8Bit, RGB 1 Bit/8Bit)
    • Zero dark time external pattern display for illumination time less than 400 uSec
    • Splash Patterns (Mono 1 Bit/ 8 Bit)

• • Display
    • External video input
    • IntelliBright video processing algorithms
    • Splash Screens
    • Source frame rates supported - 0 to 123 HZ
    • Four 2D looks (cool, medium, warm, and other) and one 3D look

• • Supported pattern timings in Sequence Database v0.5.71:

• • • Internal Pattern Mode Timings:
      
      

      Pattern Type	Sequence Index	Exposure Time Range (us)	Sequence Min Pre-Exposure Dark Time (us)	Sequence Min Post-Exposure Dark Time (us)
      1-bit Monochrome	18	200 - 399	171	31
      	17	400 - 799	171	31
      	16	800 - 799	171	31
      	15	1800 - 3799	171	31
      	14	3800 - 7600	171	31
      1-bit RGB	25	600 - 1799	171	31
      	24	1800 - 3799	171	31
      	23	3800 - 7600	171	31
      8-bit Monochrome	20	3464 - 6928	171	31
      	21*	1677 - 3463	171	31
      8-bit RGB	22	10912 - 21824	171	31

      
      

      *Sequence 21 is a special sequence that displays 7-bit patterns. The least significant bit of the 8-bit pattern data will be ignored.

      Notes:

      • For internal patterns, there will be an additional variable delay of ~3000 us at the beginning of every pattern set.
      • Exposure times shorter than the above values are not possible. Longer exposure times will operate with decreased timing accuracy and behavior is not guaranteed.
      • Shorter dark times are not possible. Longer dark times can be used. The maximum possible dark times for a desired exposure time are:
        • T_{max pre-exposure dark time}  = ( 27306us + t_{sequence min pre-exposure dark time} ) * (T_{desired exposure} / t_{sequence minimum exposure})
        • T_{max post-exposure dark time} = ( 27306us + t_{sequence min post-exposure dark time} ) * (T_{desired exposure} / t_{sequence minimum exposure})
    • External Pattern Streaming Timings:
      
      

      Pattern Type	Sequence Index	Exposure Time Range (us)	Sequence Min Pre-Exposure Dark Time (us)	Sequence Min Post-Exposure Dark Time (us)
      1-bit Monochrome	6	200 - 400	0*	0*
      	5	200 - 399	171	31
      	4	400 - 799	171	31
      	3	800 - 1799	171	31
      	2	1800 - 3799	171	31
      	1	3800 - 7600	171	31
      1-bit RGB	11	451 - 799	171	31
      	10	800 - 1799	171	31
      	9	1800 - 3799	171	31
      	8	3800 - 7600	171	31
      8-bit Monochrome	7	2555 - 5110	171	31
      8-bit RGB	0	10912 - 21824	171	31

      
      

      *Sequence 6 is a special sequence with zero pre-exposure and post-exposure dark times. (Note: While running this sequence, a dark time equivalent to the exposure time of one pattern will be added at the start of every pattern set.)

      Notes:

      • Exposure times shorter than the above values are not possible. Longer exposure times will operate with decreased timing accuracy and behavior is not guaranteed.
      • Shorter dark times are not possible. Longer dark times can be used. The maximum possible dark times for a desired exposure time are:
        • T_{max pre-exposure dark time}  = ( 6553us + t_{sequence min pre-exposure dark time} ) * (T_{desired exposure} / t_{sequence minimum exposure})
        • T_{max post-exposure dark time} = ( 6553us + t_{sequence min post-exposure dark time} ) * (T_{desired exposure} / t_{sequence minimum exposure})
    • Splash Pattern Mode Timings:
      
      

      Pattern Type	Sequence Index	Exposure Time Range (us)	Sequence Min Pre-Exposure Dark Time (us)	Sequence Min Post-Exposure Dark Time (us)
      1 -bit Monochrome	13	793 - 1744	171	31
      8-bit Monochrome	12	7737 - 17034	171	31

      
      

      Notes:

      • The maximum pattern period (pre-exposure + exposure + post-exposure) cannot exceed 2184us for 1-bit splash patterns and 17476us for 8-bit splash patterns.
    • The listed minimum dark times are applicable for the minimum exposure time of each sequence. The dark times scale along with the exposure time as per the following equation:
      • T_{min required pre-exposure dark time}  = t_{sequence min pre-exposure dark time} * (T_{desired exposure} / t_{sequence minimum exposure})
      • T_{min required post-exposure dark time} = t_{sequence min post-exposure dark time} * (T_{desired exposure} / t_{sequence minimum exposure})

• • • I²C command 0x9D (Read Validate Exposure Time) returns the minimum required pre-exposure and post-exposure dark times for a specific pattern type and given exposure time.

Updates in this release

• Firmware will support the systems with the Light Control DMDs (DLP2010LC, DLP3010LC) only.
• Auto-idle mode is not supported.
• Only DMD pin mapping options 1 and 2 are supported.
• The corruption observed in internal pattern mode while running 200us zero dark time pattern sets has been fixed.
• Patterns are only supported in RGB format (not YCbCr) when running in Splash Pattern mode.
• Thermistor processing enabled by default

Known Limitations

• Internal Patterns 8 bit RGB sequence - post dark time does not match specified value.
• Non uniformity is seen at the display borders while running 1 bit internal patterns with 0 pre,post exposure times.
• External Streaming - Signals/Patterns Incorrect in case of VSYNC jitter.
• When switching from internal pattern mode to splash pattern mode make sure that the internal pattern display is stopped.
• While using the update firmware feature of GUI, make sure that size of splash image are as small as possible and prefer selecting RGB color space if the images are of PNG format.
• LC splash pattern dispaly is only supported in RGB format.
• Only RGB888 input source format supported in External Pattern Streaming Mode.
• Unsupported Features:
  • DSI/BT656 Input
  • CPU Interface
  • LABB with Ambient Light Sensor support
  • Shallow Gradient
  • White Point Correction
  • I²C at 400KHz
  • Flashless configuration
  • Idle mode
  • Power management, clock gating and scaling
  • CAIC is not supported in LC, system will not boot up in LC mode with CAIC enabled

Technical Support and Product Updates

• • Thermistor Processing Documentation

    • Using System Temperature via I2C commands:
      • Read System Temperature (0xd6)
        • Output: 2 Bytes
          • Byte 1: LSB
          • Byte 2: MSB
      • Note: The temperature of the thermistor is read in degrees Celsius in a magnitude of 10 times the reading of thermistor. Bit 11 (the most significant bit) denotes the sign temperature. A '0' means a positive temperature, while '1' denotes a negative temperature.
        • Example #1: b(11:0) = 000110101010; 426d / 10d = 42.6degC
        • Example #2: b(11:0) = 100110101010; 426d / 10d = -42.6degC
      • Note: This temperature reading will need to be calibrated per the design and specific thermsitor chosen of custom boards. Offset to determine the true temperature of the thermistor reading. Texas Instruments DLP hardware uses Murata's NCP15WF104F03RC.

  • Additional Links

    • DLPC347x Software Programmer's Guide
    • DLP Products® E2E Forums
    • DLP Products® - Getting Started
    • DLP Pico Products overview
    • DLPC3470 Controller
    • DLP2010LC DMD
    • DLPC3478 Controller
    • DLP3010LC DMD

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