PAS302BCA-32 Datasheet, PDF (7/15 Pages) Pixart Imaging Inc. – CMOS VGA DIGITAL IMAGE SENSOR

PAS302BCA-32
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, H_Size[9:0] = 643,
Nov_By2[7:0] = 87,
NovSize = Nov_By2 *2 +1 = 175 Pixclks( default )
Line-time = NovSize + 644 = 819 Pixclks( default )
V_Size[8:0]= 487,
Hsync
GRG R
B GB G
B GB G
GRGR
NovSize
Pixclk
Valid pixel = 644 Pixclks
Figure 4.2 Inter-line timing ( default )
If Mask_Dark[3] = 0,
Vsync
Frame Time = LPF + 1 = 488 Line ( default )
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,
Vsync
Hsync
Frame Time = LPF + 1 = 488 Line ( default )
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 PAS302BCA-32, 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
PAS302BCA-32 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 2.3, 13 Sep. 2004
PixArt Imaging Inc.
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