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參數(shù)資料
| 型號： | OV7620 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | OV7620 SINGLE-CHIP CMOS VGA COLOR DIGITAL CAMERA |
| 中文描述： | OV7620的單芯片CMOS VGA彩色數(shù)碼相機 |
| 文件頁數(shù)： | 23/60頁 |
| 文件大?。?/td> | 313K |
| 代理商： | OV7620 |
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OV7620 Product Specifications - Rev. 1.2 (5/13/00)
OMNIVISION TECHNOLOGIES INC.
23
Preliminary
Company Confidential
1.10 Slave Mode Operation
OV7620 can be programmable to be slave device. Default OV7620 is a master device, it provide
Hsync, Vsync output. If used as slave device, (register 29 bit 6=1), external master device must
provide:
System clock CLK to
XCLK1
pin;
Horizontal sync Hsync to
CHSYNC
pin, positive acted.
Vertical frame sync Vsync to
VSYNC
pin, positive acted.
When in slave mode, OV7620 tri-state
CHSYNC
and
VSYNC
output pin and use as input pin. To
synchronize the chip, OV7620 use external system clock CLK synchronize external horizontal
sync Hsync, then use synchronized horizontal sync to synchronize external vertical frame sync
Vsync. But to match internal counter, these three must keep exact relation as below:
Hsync period is 2*858 * CLK
Vsync period is 525* 2*858 * CLK
Tclk
FIG 1.5 Slave Mode External Sync Timing
OV7620 will be stable after 1 frame. (2nd Vsync).
1.11 Frame Exposure Mode
OV7620 support frame exposure mode when in Progressive Scan Mode. When the
FREX
pin is
used as an external master device sets the exposure time. When
FREX
=1, the whole array is
precharged. The exposure time is then determined by the external master device which controls
FREX
. When
FREX
=0, the OV7620 begins to output data line by line. While data is output, the
OV7620 must be blocked from light by using a mechanical shutter, so that the whole array is ex-
posed at the same time and has the same exposure period. In default line exposure mode, the
array precharge and read mode is first charge 1st line, after one line read out, precharge 2nd
line, so on. the width of
FREX
=1 must large the a fixed timing to make sure whole array has been
precharged.
Frame exposure mode timing is as below:
CLK
Hsync
Vsync
1 frame = 525*2*858*Tclk
1 line=2*858*Tclk
Tvs
Note: (1) Ths > 6*Tclk (2) Ths < Tvs < 2*858*Tclk
Ths
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| OV7635 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:COLOR | VGA | 640 x 480 | DIGITAL | CameraChip | TECHNICAL BULLETIN |
| OV7640 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:OV7640 Color CMOS VGA (640 x 480) CAMERACHIP OV7141 B&W CMOS VGA (640 x 480) CAMERACHIP |
| OV7648 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:COLOR | VGA | 640 x 480 | DIGITAL | CameraChip | TECHNICAL BULLETIN |
| OV7670 | 制造商:OMNIVISION 制造商全稱:OMNIVISION 功能描述:1/6 inch VGA CameraChip for ultra-thin camera modules |
| OV7675 | 制造商:OMNIVISION 制造商全稱:OMNIVISION 功能描述:Higher Performance, Feature Rich VGA Sensor to Support Fast Growing EmergingMarkets |
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