ZHCSAT8G september   2012  – october 2020 SN65DSI85

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings #GUID-24B27461-2407-4A70-B6CA-5D1E4961612D/SLLSEB91839
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
  8.   Parameter Measurement Information
  9. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Clock Configurations and Multipliers
      2. 7.3.2 ULPS
      3. 7.3.3 LVDS Pattern Generation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operating Modes
      2. 7.4.2 24
      3. 7.4.3 Reset Implementation
      4. 7.4.4 Initialization Sequence
      5. 7.4.5 LVDS Output Formats
      6. 7.4.6 DSI Lane Merging
      7. 7.4.7 DSI Pixel Stream Packets
      8. 7.4.8 DSI Video Transmission Specifications
    5. 7.5 Programming
      1. 7.5.1 Local I2C Interface Overview
    6. 7.6 Register Maps
      1. 7.6.1 Control and Status Registers Overview
  10. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Video STOP and Restart Sequence
      2. 8.1.2 Reverse LVDS Pin Order Option
      3. 8.1.3 IRQ Usage
    2. 8.2 Typical Applications
      1. 8.2.1 Typical WUXGA 18-bpp Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Example Script
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Typical WQXGA 24-bpp Application
        1. 8.2.2.1 Design Requirements
  11. 9 Power Supply Recommendations
    1. 9.1 VCC Power Supply
    2. 9.2 VCORE Power Supply
  12. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Package Specific
      2. 10.1.2 Differential pairs
      3. 10.1.3 Ground
    2. 10.2 Layout Example
  13. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
  14. 12Mechanical, Packaging, and Orderable Information

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7.4.3 Reset Implementation

When EN is de-asserted (low), the SN65DSI85 is in SHUTDOWN or RESET state. In this state, CMOS inputs are ignored, the MIPI® D-PHY inputs are disabled and outputs are high impedance. It is critical to transition the EN input from a low to a high level after the VCC supply has reached the minimum operating voltage as shown in Figure 7-1. This is achieved by a control signal to the EN input, or by an external capacitor connected between EN and GND.

GUID-D565EA27-DECC-49E6-9A0A-CF9807E23167-low.gifFigure 7-1 Cold Start VCC Ramp up to EN

When implementing the external capacitor, the size of the external capacitor depends on the power up ramp of the VCC supply, where a slower ramp-up results in a larger value external capacitor. See the latest reference schematic for the SN65DSI85 device and, or consider approximately 200 nF capacitor as a reasonable first estimate for the size of the external capacitor.

Both EN implementations are shown in Figure 7-2 and Figure 7-3.

GUID-6B48458A-7D6F-4446-880C-58EE45B70F8B-low.gifFigure 7-2 External Capacitor Controlled EN
GUID-B1A0CA22-876E-47BA-B1E9-920CAFA3BF6C-low.gifFigure 7-3 EN Input from Active Controller

When the SN65DSI85 is reset while VCC is high, the EN pin must be held low for at least 10 ms before being asserted high as described in Table 7-5 to be sure that the device is properly reset. The DSI CLK lane MUST be in HS and the DSI data lanes MUST be driven to LP11 while the device is in reset before the EN pin is asserted per the timing described in Table 7-5.