JAJSG74C February   2012  – September 2018 DS90C187

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション
      2.      代表的なアプリケーション
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     DS90C187 Pin Descriptions — Serializer
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Recommended Input Characteristics
    7. 7.7 Switching Characteristics
    8. 7.8 AC Timing Diagrams
    9. 7.9 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Device Functional Modes
      1. 8.3.1  Device Configuration
      2. 8.3.2  Single Pixel Input / Single Pixel Output
      3. 8.3.3  Single Pixel Input / Dual Pixel Output
      4. 8.3.4  Dual Pixel Input / Dual Pixel Output
      5. 8.3.5  Pixel Clock Edge Select (RFB)
      6. 8.3.6  Power Management
      7. 8.3.7  Sleep Mode (PDB)
      8. 8.3.8  LVDS Outputs
      9. 8.3.9  18 bit / 24 bit Color Mode (18B)
      10. 8.3.10 LVCMOS Inputs
    4. 8.4 Programming
      1. 8.4.1 LVDS Interface / TFT Color Data Recommended Mapping
        1. 8.4.1.1 Color Mapping Information
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 LVDS Interconnect Guidelines
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Up Sequence
    2. 10.2 Power Supply Filtering
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 ドキュメントのサポート
      1. 12.1.1 関連資料
    2. 12.2 ドキュメントの更新通知を受け取る方法
    3. 12.3 コミュニティ・リソース
    4. 12.4 商標
    5. 12.5 静電気放電に関する注意事項
    6. 12.6 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

10.1 Power Up Sequence

The VDD power supply pins do not require a specific power on sequence and can be powered on in any order. However, the PDB pin should only be set to logic HIGH once the power sent to all supply pins is stable. Active data inputs should not be applied to the DS90C187 until all of the input power pins have been powered on, settled to the recommended operating voltage and the PDB pin has be set to logic HIGH.

The user experience can be impacted by the way a system powers up and powers down an LCD screen. The following sequence is recommended:

Power up sequence (DS90C187 PDB input initially LOW):

  1. Ramp up LCD power (maybe 0.5ms to 10ms) but keep backlight turned off.
  2. Toggle DS90C187 power down pin to PDB = VDD.
  3. Enable clock and wait for additional 0-200ms to ensure display noise won’t occur.
  4. Enable video source output; start sending black video data.
  5. Send >1ms of black video data; this allows the DS90C187 to be phase locked, and the display to show black data first.
  6. Start sending true image data.
  7. Enable backlight.

Power Down sequence (DS90C187 PDB input initially HIGH):

  1. Disable LCD backlight; wait for the minimum time specified in the LCD data sheet for the backlight to go low.
  2. Video source output data switch from active video data to black image data (all visible pixel turn black); drive this for >2 frame times.
  3. Set DS90C187 power down pin to PDB = GND.
  4. Disable the video output of the video source.
  5. Remove power from the LCD panel for lowest system power.

The DS90C187 is highly sensitive to the VDD input. Even small levels on the VDD pin prior to full power up should be avoided. The user should additionally take care to not drive or pull up the CMOS inputs to the device prior to device power up so as to ensure proper power on behavior.