MCM20027 查看數據表（PDF） - Motorola => Freescale

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MCM20027

Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC, digital programming, control, timing, and pixel correction features

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

ImageMOS

G1 R

G1 R

B G2

B

G2

G1 R

G1 R

BB

B

G2

B

G2

Figure 4. On-chip Bayer CFA

A

15o

15o

B

Iris

microlenses

3.1 Continuous Frame Rolling Shutter capture

(CFRS) [Default]

The default mode of image capture is the “Continuous

Frame Rolling Shutter” capture mode (CFRS). This

mode will yield frame rates up to 10fps at 13.5 MHz

MCLK. In this mode the image integration and row read-

out take place in parallel. While a row of pixels is being

read out, another row(s) are being integrated. Readout

of each row follows the Integration of that row. There-

fore the Integration of the rows are staggered out due to

the Readout of sequential rows occurring one after the

other (see “Integration Time in CFRS mode:” on

page 13).

In CFRS, after one frame has completed integrating,

the first row of the second frame automatically begins

integrating. The readout of the rows also follow the

same routine. The waveforms depicting the CFRS out-

put data stream refer to Figure 6, on page 11 and Figure

7, on page 12.

3.1.1 CFRS Video Encoded Data stream

The Pixel Data Stream Signal Control Register, (Table

55), on page 62 allows the user to select how the output

pixel data stream in Continuous Frame Rolling Shutter

mode is encoded/formatted. In default mode, internally

generated signals SOF, VCLK, HCLK etc. drive the in-

tegration and readout of the pixel data frames but only

the valid pixel data is readout of the sensor. When a “1”

is written to bit 5 of the Pixel Data Stream Signal Control

Register, (Table 55), on page 62, it causes the output

pixel data to be encoded with SOF, VCLK and End Of

Frame signals. It accomplishes this by attaching the pix-

el data with certain predefined signal data. The Video

Encoded Signal Definitions, (Table 2), on page 10 de-

fines the data that represents the SOF, VCLK and End

of Frame signals.

Figure 5. a) 15 degrees acceptance angle

b) Improvement in pixel sensitivity results from fo-

cusing incident light on photo sensitive portions of

the pixel by using microlenses

3.0 Frame Capture Modes

There exists two frame capture modes:

1) Continuous Frame Rolling Shutter mode (CFRS)

2) Single Frame Rolling Shutter mode (SFRS)

The sensor can be put into either one of the aforemen-

tioned modes by writing either “1” or “0” to Bit 6 of Cap-

ture Mode Control Register, (Table 31), on page 48.

Signal

Description

Data

SOF

Start of Row read-

out (i.e.. Readout of

Row 1)

3FF3FF3FF3FF

VCLK

Start of Row read- 3FF3FF000000

out of Rows 2+

End Of Readout of last Row 000000000000

Frame

complete

Table 2. Video Encoded Signal Definitions

MOTOROLA

Revision 8.4 - 24 Oct 2002: MCM20027

10

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