PAS302BCW-22S
CMOS Image Sensor IC
4.2 Output Timing
VGA mode ( 644 x 488 ) pixel readout:
H_Start[9:0] = 0,
V_Start[8:0] = 0,
Nov_By2[7:0] = 87,
H_Size[9:0] = 643,
V_Size[8:0]= 487,
NovSize = Nov_By2 *2 +1 = 175 Pixclks( default )
Line-time = NovSize + 644 = 819 Pixclks( default )
Hsync
G R G R
NovSize
Pixclk
B G B G
Valid pixel = 644 Pixclks
B G B G
G R G R
Figure 4.2 Inter-line timing ( default )
If Mask_Dark[3] = 0,
Frame Time = LPF + 1 = 488 Line ( default )
Vsync
Hsync
Dark
Dark
Dark
Dark
Dark
Dark Line = 4 Line
Valid Line = 484 Line
Figure 4.3 Inter-frame timing (LPF default setting = 487, Mask_Dark[3] =0)
If Mask_Dark[3] = 1,
Frame Time = LPF + 1 = 488 Line ( default )
Vsync
Hsync
Dark Line = 4 Line
Valid Line = 484 Line
Figure 4.4 Inter-frame timing (LPF default setting = 487, Mask_Dark[3] =1)
4.3 Hardware Windowing
Users are allowed to define window size as well as window location in PAS302BCW-22S,
Window size can range from 20x14 to 644x484. The location of window can be anywhere in the
sensor array. Window location and size is defined by register H_Start, V_Start, H_Size and
V_Size; the H_Start defines the starting column while V_Start defines the starting row of the
window; the H_Size define the column width of the window and V_Start define the row depth of
the window.
4.4 Sub-sampling
PAS302BCW-22S can be programmed to output image in QVGA and QQVGA size by setting
Registers Skip_Digital or Skip_Analog. In QVGA sub-sampling mode, both vertical and
horizontal pixels are sub-sampling at 1/2, while in QQVGA sub-sampling mode, both vertical
and horizontal pixels are sub-sampling at 1/4. The maximum sub-sampling rate is 1/16.
Version 2.4, 20 Sep. 2005
E-mail: fae_service@pixart.com.tw
PixArt Imaging Inc.
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