PAC407BCA/PAC407BCW

CMOS Image Sensor IC

Version 1.7, 13 Sep

2004

PixArt Imaging Inc.

E-mail: fae_service@pixart.com.tw

10

B

Invalid

Data

PX[7:0]

HSYNC

PXCK

GB

G

Figure 4.6 RAW Data Output Timing

Invalid

Data

PX[7:0]

HSYNC

PXCK

R4

R3

R2

R1

R0

G5

G4

G3

First Byte

Second Byte

G2

G1

G0

B4

B3

B2

B1

B0

PX[7]

PX[6]

PX[5]

PX[4]

PX[3]

PX[2]

PX[1]

PX[0]

PX[7]

PX[6]

PX[5]

PX[4]

PX[3]

PX[2]

PX[1]

PX[0]

Y1H

Y1L

Y2H

Y2L

Figure 4.7 RGB565 Output Timing

Y

Invalid

Data

PX[7:0]

HSYNC

PXCK

Cb

Y

Cr

Figure 4.8 YCbCr422 Output Timing

Since the output stream of YCbCr422 or RGB565 format is two times then sensor raw data output, we

should double the pixel clock rate while data format is in YCbCr422 or RGB565 mode.

The minimum of Np=1 in sensor timing generator that means the pixel clock rate is the same as system

clock rate. Noticed that Np=1 can only be used in sensor raw data mode. When PAC407 is operated in

YCbCr422 or RGB565 mode, the minimum of Np should be 2. Besides, when Np is odd number, the duty

cycle of PXCK will not be 50%.

Note: The detail timing description for raw data output format could be found in PAS302 spec.