DLPS249 December   2024 DLP991U

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  Storage Conditions
    3. 5.3  ESD Ratings
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Thermal Information
    6. 5.6  Electrical Characteristics
    7. 5.7  Switching Characteristics
    8. 5.8  Timing Requirements
    9. 5.9  System Mounting Interface Loads
    10. 5.10 Micromirror Array Physical Characteristics
    11. 5.11 Micromirror Array Optical Characteristics
    12. 5.12 Window Characteristics
    13. 5.13 Chipset Component Usage Specification
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Power Interface
      2. 6.3.2 Timing
    4. 6.4 Device Functional Modes
    5. 6.5 Optical Interface and System Image Quality Considerations
      1. 6.5.1 Numerical Aperture and Stray Light Control
      2. 6.5.2 Pupil Match
      3. 6.5.3 Illumination Overfill
    6. 6.6 DMD Temperature Calculation
      1. 6.6.1 Off-State Thermal Differential (TDELTA_MIN)
      2. 6.6.2 On-State Thermal Differential (TDELTA_MAX)
    7. 6.7 Micromirror Power Density Calculation
    8. 6.8 Micromirror Landed-On/Landed-Off Duty Cycle
      1. 6.8.1 Definition of Micromirror Landed-On/Landed-Off Duty Cycle
      2. 6.8.2 Landed Duty Cycle and Useful Life of the DMD
      3. 6.8.3 Landed Duty Cycle and Operational DMD Temperature
      4. 6.8.4 Estimating the Long-Term Average Landed Duty Cycle of a Product or Application
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
    3. 7.3 DMD Die Temperature Sensing
    4. 7.4 Power Supply Recommendations
      1. 7.4.1 DMD Power Supply Power-Up Procedure
      2. 7.4.2 DMD Power Supply Power-Down Procedure
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
        1. 7.5.1.1 PCB Design Standards
        2. 7.5.1.2 General PCB Routing
          1. 7.5.1.2.1 Trace Impedance and Routing Priority
          2. 7.5.1.2.2 Example PCB Layer Stack-Up
          3. 7.5.1.2.3 Trace Width, Spacing
          4. 7.5.1.2.4 Power and Ground Planes
          5. 7.5.1.2.5 Trace Length Matching
            1. 7.5.1.2.5.1 HSSI Input Bus Skew
            2. 7.5.1.2.5.2 Other Timing Critical Signals
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Device Nomenclature
      2. 8.1.2 Device Markings
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Package Option Addendum
      1. 10.1.1 Packaging Information

7.3 DMD Die Temperature Sensing

The DMD features a built-in thermal diode that measures the temperature at one corner of the die outside the micromirror array. The thermal diode can be interfaced with the TMP461 temperature sensor, as shown in Figure 7-2. The serial bus from the TMP461 can be connected to the DLPC964 industrial controller to enable its temperature sensing features. See the DLPC964 Digital Micromirror Device Controller Data Sheet for more information about how to query the temperature readings.

The DLPC964 industrial controller can configure the TMP461 to read the DMD temperature sensor diode. This data can be leveraged to incorporate additional functionality in the overall system design such as adjusting illumination power, fan speeds, active cooling temperatures, or flow rates, and so on. All communication between the TMP461 and the DLPC964 industrial controller are completed using the I2C interface. The TMP461 connects to the DMD via pins E23 and F22, as outlined in Pin Configuration and Functions.

DLP991U System Board Routing Example for Temperature SensorFigure 7-2 System Board Routing Example for Temperature Sensor
  1. Details are omitted for clarity. See the TI reference design for connections to the DLPC964 industrial controller.
  2. See the TMP461 Data Sheet for system board layout recommendations.
  3. See the TMP461 Data Sheet and the TI Reference Design for suggested component values for R1, R2, R3, R4, and C1.
  4. R5 = 0Ω. R6 = 0Ω. Zero ohm resistors should be located close to the DMD package pins.