OLYMPUS C-150 Description of Mechanism V1

H. DESCRIPTION OF MECHANISM

C-150/D-390

H. DESCRIPTION OF MECHANISM

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H. DESCRIPTION OF MECHANISM C-150/D-390

C-150/D-390 is a 2.11Mega pixels DSC (Digital Still Camera). ASIC consists of ARM7TDMI RISC processor and TI

TMS320DSC21. There are several peripherals around the ASIC and following is the main elements.

Main processor: TMS320DSC21

Code memory: Flash memory (firmware stored)

Front-end: Array sensor, AFE (Analog Front End), TG (Timing Generator) and VD (Vertical Driver)

User Interface: Key, LED

Display devices: TFT LCD module, Video out (NTSC/PAL supported)

Lighting device: Flash lamp module

Image buffer: SDRAM

Image storage media: xD card interface

Communication port: USB 1.1

Mechanical devices: AF motor, mechanical shutter

Power supply: DC-DC converter (PWM controlled)

These modules provide separate functions to perform complete DSC features which not only capture pictures,

but also help end-users to use the camera.The brief functionalities of each block are followings:

Array CCD: The analog signal from CCD is changed into a digital signal.

AFE (Analog Front End): Generation of the timing for operating CCD arrangement.

TG (Timing Generator): Generates some dedicated timings to operate array CCD.

VD (Vertical Driver): A digital level signal is changed into a CCD driver signal.

TMS320DSC21: Color image processing

KEY: Accept the inputs from users

LED: A status display and the situation of a camera of operation are transmitted to a user.

SHUTTER: To block lights from array CCD when take images.

AF MODULE: Auto-Focus mechanism.

USB: Communicate with a host to transfer pictures

FLASH MEMORY: Codes were stored to command ASIC to operate the necessary functions.

FLASH LAMP: Lighten the object.

xD CARD SLOT: Store the grabbed images. This external memory card lets users can save more pictures.

SDRAM: Processing and storing of a picture.

TFT LCD MODULE: Display the image camera sees or play back the captured pictures.

It is also a graphic user interface

TV OUT: Output a video signal (NTSC or PAL format) to a TV set.

RTC: Control of a date and time.

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