Hand Held Products IT4000, Руководство по интеграции

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Chapter 1 - Introduction and Installation
About the 2D Image Engine ................................................................................................................1-1
ESD Precautions ..................................................................................................................................1-1
Dust and Dirt .......................................................................................................................................1-1
Product Specifications .........................................................................................................................1-1
Interface Connector .............................................................................................................................1-2
Connector View ............................................................................................................................1-2
Connector Mechanical ..................................................................................................................1-2
Imager Orientation ........................................................................................................................1-3
Connector Position and Flex Orientation......................................................................................1-3
Connector.............................................................................................................................................1-3
Connector Pinout...........................................................................................................................1-3
Electrical Interface Considerations......................................................................................................1-4
Chapter 2 - Working with the IT4X00 Series
Serial Command Interface (I
2
C) ..........................................................................................................2-1
Data Write Sequence.....................................................................................................................2-1
Data Read Sequence......................................................................................................................2-1
I2C Style Interface Basic Waveforms...........................................................................................2-2
Timing Chain .......................................................................................................................................2-2
Control Register Table ..................................................................................................................2-2
Vertical Considerations.................................................................................................................2-2
Horizontal Considerations.............................................................................................................2-3
Active Pixel Window Alignment ........................................................................................................2-3
Vertical..........................................................................................................................................2-4
Horizontal......................................................................................................................................2-4
Interdependencies ................................................................................................................................2-4
Column Position of CDS Subtraction Pulse (Reg. 0x9C, 0x9B) ..................................................2-4
Exposure vs. Frame Height (Number of Lines per Frame)...........................................................2-4
Changes in Exposure Value vs. Frame Height .............................................................................2-5
Exposure vs. Frame Width (Number of Pixel Clocks per Line/Row) ..........................................2-5
Exposure Control Method and Exposure/Data Clock Out Timeline ...................................................2-5
The Effects of Timing on Noise ..........................................................................................................2-6
Register Settings and Associated Timing Diagrams for Windowed Image Acquisition ....................2-6
Initial Configuration (FPGA, ASIC).............................................................................................2-6
Preliminary Intel PXA27X Interface ............................................................................................2-7
Illumination/Aimer Control ...............................................................................................................2-10
Aimer Modes...............................................................................................................................2-10
Laser Aimer Thermal Considerations .........................................................................................2-11
LED Power Control PWM ..........................................................................................................2-11
LED Current for Selected Duty Cycle Settings ..........................................................................2-11
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