Download: Reference Information 2-1 Circuit description 2-1-1 DSC

Reference Information 2-1 Circuit description 2-1-1 DSC Digital camera(SDC-30/33), is an image-input device that connects to a PC. It’s small and light welght, supplies high quality images and has a large capacity (4MB/2MB). The digital camera consists of 3 sections: Camera, signal processing and storage. 1. Camera The camera is similar to a camcorder but adapts a scanning method of 525/30 (which can read an entire image of in one frame, whereas the camcorder’s scanning method is 525/60. Photo-exposure is controlled by the electronic shutter through timing generator and CCD driver IC (where ...
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Reference Information 2-1 Circuit description 2-1-1 DSC Digital camera(SDC-30/33), is an image-input device that connects to a PC. It’s small and light welght, supplies high quality images and has a large capacity (4MB/2MB). The digital camera consists of 3 sections: Camera, signal processing and storage. 1. Camera The camera is similar to a camcorder but adapts a scanning method of 525/30 (which can read an entire image of in one frame, whereas the camcorder’s scanning method is 525/60. Photo-exposure is controlled by the electronic shutter through timing generator and CCD driver IC (where as a camcorder controls the exposure using an IRIS). Main function of this part is to control the photo-exposure in accordance with the brightness, and to store the image in DRAM. 2. Digital Signal Processing Image information of 1 frame is temporarily stored in DRAM. Image information stored in DRAM is the digitalized CCD signal from the camera. It needs additional image signal processing by the 32-bit microprocessor. The image signal processing done by the microprocessor includes white balance, shape adjustment and Y/C signal conversion. 3. Storage After image signal processing, an image signal compression technique allows more image to be stored in the limited memory. In the case of SDC-30/33, 10:1 compression is normally executed for standard JPEG specification. After compression, the image information is stored in the nonvolatile flash memory : Max. 45/22 frame for VGA(640*480), and max 180/90 frame for QVGA(320*240). The image can be stored, edited, and printed by the PC image editing program that is supplied with the camera. 2-1-2 Power LCD MICOM generates the control signal that turns on the system (5V). When the power is on, the signal turns on IC140 PWM IC which outputs 5V through T141. When shot key is pressed, the signal for output is generated from MICOM, which turns on IC120 PWM IC and outputs 5V, -7V, and 15V through T121. After the shot, the camera control signal turns off the power supply with- in. 5sec (through T121). 2-1-3 DC/DC block operation description 2-1-3(A) DC/DC BLOCK CONSISTS OF THREE COMPONENTS AS BELOW. 1. EVER5V EVER5V consists of S8420 (IC100) IC and the assocciat battery circuitry (CN101 Pin2) is input to IC100 (S8420). Pin 8 and 5V voltage are generated internally and are output to pins 1 and 7. EVER5V power (Pin 1) is input to the function board for LCD MICOM (IC601) drive, POWER S/W (LED01) driving power, and PULL-UPvoltage. RESET output of IC100 Pin 5, which changes from low to high at the power input, is connected to LCD MICOM RESET PIN (and resets LCD MICOM). Samsung Electronics 2-1, 2. Camera power Camera power block consists of IC120 (PWM IC MB3800), Q121 (INVERTER TR DTC144EU), Q122 (SWITCH- ING TR KSD1621), and rectifier circuit. When CAM5V control pin of LCD MICOM 10PIN is high, it is converted at Q121 and IC 120. Pin 4 becomes low; then IC120 Pin 7 starts oscillating and the PWM output from IC120 Pin 5 switches Q122. Pin 6 generates the 15V output by a switching pulse and this output is rectified by D121, L123, C127, and C128 to generate 15V power for the drive of CCD (IC201) and V DRIVE IC (MN3112SA). The pulse for -7V (which is generated at T121 pin 10), is rectified by D121, C129, L124, C130 and becomes -7V power for the drive of CCD and V DRIVE IC. The pulse for 5V power, which is output from T121 pin 7, becomes CAMERA 5V power by D122, C133, L127, and C134. The 5V power is divided by D5V for the drive of IC204(MN5246) and IC202(MN3112SA) and A5V for the drive of IC203, IC205, and IC206 through L125. 3. SYS 5V Using the same technique as with camera 5V (L141, IC140, Q142, and T141), the SYS 5V power drives IC301, IC302, IC303, IC304 and IC307, and is generated by SYS 5V CONT from the LCD micom. EVER5V power is always output when battery and adapter are connected; SYS 5V power is output only when power is turned on. CAM power is output for 0.5 second (only during shot operation). 2-1-4 Camera 1/3" 35 CDS out AGC IN D7~D0 D15~D0 Vout CDS Vout A/D Data 8CCD 8-16 CONV. Data 16 DRAM AGC (8bit) DRAM CTRL 4Mb R SMD V1~V4 Address H1 SHP VSUB A9~A1 LENS H2 Timing V-Drive D Data, DCLKGen HD, VD Camera S/W Ctrl DSCP RISC Chip 1. Camera operation Fig. 2-1 The image from the lens is converted to an electrical signal by the photoelectric conversion component, CCD (MN3776PE). Each pulse used to extract CCD signal is generated by the timing geneartor IC(MN5246), converted to actual driving voltage by V Drive IC(MN3112SA), and supplied to CCD. After noise elimination (CDS) and amplification (AGC) at analog process IC(NN2038FAQ), CCD output signal is converted to a digital signal by A/D converter. The 8-bit digital data is changed to 16-bit by DRAM control IC(SMA9606), and stored in the DRAM. 2-2 Samsung Electronics, 2. Lens SDC-30/33 lens uses a fixed focus method, and can take a photograph clearly at over 1 meter distance (optimal quality is between 1.5 and 3 meters). 3. Color FilterRGRG– – Color filter, which remove, the color information on CCD, adapts RGB methodGBGB– – for best color characteristics and Bayer method for best. RGRG– – 4. CCD(MN3776PE) and V Driver(MN3112SA) GBGB– – CCD converts the optical image to an electrical signal and is similar to an existing camcorder (except for the scanning method). The camcorder method – – – – – – uses interlace scanning, which outputs a field image every 1/60 second. (First field consists of odd lines, the second field consists of even line, and a complete – – – – – – picture consists of two fields. However, SDC-30/33 uses a the progressive scanning method, which outputs a frame every 1/30 second (and has excellent vertical resolution). The image is output at Pin 1 of CCD, and is input to Pin39 of analog signal process IC (IC203) through TR (Q201). V Driver IC (MN3112SA) mixes each CCD driving pulse from Timing Generator IC, and converts it to the required voltage. Effective Pixel 325,546=659(H)X494(V) ØV1~ØV4: Vertical Shift Clock ØH1~ØH2: ØØØØVVVVHorizontal Shift Clock1324V01: Video output 15 13 14 12

V

P W 16ertical

S

hift

R

eVO11gi(Bias) LG2s9SUBteVO25r11PTOD4Horizontal Shift Register 1 Horizontal Shift Register2368710ØROGØH1ØH2SGFig. 2-2 Samsung Electronics 2-3, 5. Timing Generator (MN5246) A timing generator generates each clock, synchronized signal, and CCD driving pulse for the system. Also, it receives the shutter speed information for the photo-exposure control (from the microprocessor). CCD CDS Signal process Image signal bias

MN5246 VDLIDE

2fck=24.5Mhz Fig. 2-3 6. Analog processing IC (MN2038FAQ) After eliminating the noise (CDS) from the CCD output signal (which is input to Pin39, to DS1/DS2 signal of TG), Analog processing IC outputs it to Pin 46, and then it is input to pin 2 through C232 (for Row Clip and primary amplificationAGC). Then it is output to Pin 35 and Pin 37 of EVR (IC206), which is input to pin 36, which controls AGC. Pin 35 output signal is input to Pin 26 through C218, and is amplified second time at the main amplifier. The offset adjust (pin 16 input) is activated by EVR output signal (Pin 4) and the output (Pin 21) is sent to A/D converter. Fig. 2-4 2-4 Samsung Electronics H1 H2

R

V1 ØV1 V2 ØV2 V3 ØV3 V4 SUB ØV4 CH1 ØSUB SG ØSG DS1,DS2

CLK CSYNC

VDO,HDO, 7. A/D converter (KAD0228) and DRAM Controller (SMA9606) A/D converter converts the analog signal which is output from Analog processing IC to the 8-bit digital signal (24.54Mhz). DRAM Controller is synchronized with Vsync, converts the 8-bit data which is output from A/D converter to 16-bit data, and stores it in DRAM (controlled by the 32-bit microprocessor). Data Register SO & SCK MODE SIO SI

SCS

AE Data Detect. AD–_IN(9:0) D–_OUT(15:0) 2 & Knee, 8bit to 16bit Convert ADCK IN(12.27MHz)

TRI

STATE WND1 OUT OUTPUT RAS WND2 OUT– (High Z CASU–

DRAM

when CASL– VD/HD WR Address GEN Power Off) – OE Generator EXT VD IN– EXT HD IN A–OUT(9:1) CLK IN(24.54MHz) EOC H ADJ– V ADJ R/B– ADDR/DATA BREQ BUS– OE– BACK– CONTROL Fig. 2-5 Samsung Electronics 2-5, 2-1-5 Digital Section 1. Overview 8-6 CONV DRAM Flash DRAM CTRL 4Mb Memory 16Mb/32Mb Camera S/W S/W Memory PC I/F Ctrl DSCP JPEG Ctrl 32bit RISC MICROPROCESSOR Power LCD LCD Control Micom Pannel Fig. 2-6 2. DRAM (KM416C256BLT) and flash memory (TC5832FT/TC5816FT) DRAM stores the image signal temporarily and enables the microprocessor to process the signal. Flash memory (nonvolatile) records various system information and the compressed image. 3. 32-bit RISC microprocessor (HD6477043F28) This microprocessor is the core of the system and handles the camera control, image signal processing, image compression, flash memory control, communication with PC, and communication with LCD control MICOM. (Refer to 2-1-6 “System Control” for details.) 2-6 Samsung Electronics, 2-1-6 Sytem control Dual controller (MICOM) is located in DSC : A RISC chip controls the signal processing, and is the 4-bit MICOM controls the LCD, timer, and switch. Fig. 2-7 1. 4-bit MICOM; Functions and connections 1) PIN connection status - RISC is connected to the 4-bit MICOM (total 7 lines). - Pins 98, 130, and 108 and SCI No. 1 are used. - Pins 132, 133, 134, and 136 are used for communication with 4-bit MICOM. - Synchronized communication is used with 4-bit MICOM. 2) Function - RISC is usally in the standby mode (low-power) because it consumes so much current when it operates. - 4-bit MICOM acknowledges the starting time (for example, when the user pushes the shot key) and sends the NMI pin signal to RISC, so that the standby mode can be changed to the operation mode. The information is sent to RISC through communication port. After RISC executes the appropriate program, it returns to the standby mode. 2. Main function of 4-bit MICOM - Power ON/OFF: 4-bit MICOM turns the PC (main body) on, and turns on the RISC. - Execution of shot: When the shot is executed by the PC key (or main body), 4-bit MICOM signals the shot execution to RISC. When the shot is finished (system 5V and head power 5V), 4-bit MICOM changes the RISC mode to standby mode. - Delay shot: When the delay shot is executed by the PC key (or main body), 4-bit MICOM signals the RISC and supplies the system 5V and head power 5V. Then, the RISC changes to standby mode. Samsung Electronics 2-7, - Mode change: When the mode is input by the PC key (or main body), 4-bit MICOM signals the RISC. When the mode is changed, 4-bit MICOM displays it on LCD, and changes the RISC to standby mode. - Delete execution: When the delete instruction is input by the PC key (or main body), 4-bit MICOM signal the RISC and changes the RISC to standby mode. - LCD display: DSC status is displayed. - Error handling: When an error occurs, (or RISC) the error message is displayed on LCD. If the RISC cannot operate, the power is automatically off. - Battery operation: The capacity of battery is classified as "Full", "Half", "Low", or "Battery replacement". For the "Battery replacement" status, only the power on/off function is available, and other functions cannot operate. - Auto power OFF: When any operation has not been executed (three minutes for main body operation, or 10 minutes for PC operation) the power automatically turns off. 3. Main functions of RISC processor - Communication with 4-bit MICOM: RISC operation is completely controlled by the 4-bit MICOM. A synchronization method is adapted for communication between 4-bit MICOM and RISC (with 8-bit*11 byte communication). - DRAM control: RISC processor includes internal BSC. BSC helps RISC to control the DRAM. RISC uses DRAM as though it were internal RAM (with the help of BSC). BSC generates all DRAM control signals by itself. RISC uses DRAM for the image buffer, temp memory for the calculation, and an area that manages the flash memory and FAT(File Allocation Table). - Camera Head control: RISC handles the control of the camera head during the shot. RISC controls the timing generator, ASIC, etc. so that the image data from CCD can be transferred. - Signal processing: RISC executes the signaling processing internally with CCD image data stored in DRAM. After RISC separates CCD data into RGB, and processes detail and gamma, it creates a YUV signal, and executes JPEG compression. The compressed JPEG data will be stored in DRAM again. - Flash memory control: The compressed data (in DRAM) is stored in the flash memory. The file management program is recorded in RISC, and manages the files in the flash memory (file location, file size, etc). - PC communication: RISC processor receives the signal from PC (4-bit MICOM) and activates up RISC. Then, RISC processor sets the flag for the request input from PC, and transfers the flag to RISC. The RISC communicates with PC through the serial port. (PC always requests the PC communication to DSC, but RISC does not request it from the PC.) - Battery level checking: Battery indicator, which is displayed in LCD of 4-bit MICOM, accepts the data from RISC. Battery level checking is executed when the camera head and main board are on. When new battery is inserted, it outputs 6.2V; but the actual voltage drops below 6V after supplying power to the camera head and main board. 2-8 Samsung Electronics, 2-2 IC Blocks 2-2-1 IC301 (SMA9606) Samsung Electronics 2-9, 2-2-2 IC302 (KM416C256BLT) 2-10 Samsung Electronics, 2-2-3 IC304 (HD6477043) Samsung Electronics 2-11, 2-2-4 IC307 (TC5832FT) 2-12 Samsung Electronics, 2-2-5 IC601 (UPD75P3116GC) 2-2-6 IC501 (MAX232C) Samsung Electronics 2-13, 2-2-7 IC203 (NN2038FAQ) 2-14 Samsung Electronics, 2-2-8 IC204 (NN5248) Samsung Electronics 2-15,

MEMO

2-16 Samsung Electronics]
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