PAS005B Datasheet, PDF (30/41 Pages) Pixart Imaging Inc. – SXGA Color/Mono Digital CMOS Image Sensor

PixArt Imaging Inc.
PAS005B
CMOS Image Sensor IC
EXAMPLE_3: QVGA Exposure time setting
when
system clock 48M hz
pxclk
12M hz
exposure time
2/120 sec
Please keep L_P_F = 241
and Calculate Ny = ? and Ne = ? ,












Application






System_clk
Np
Pixel_clk


















Power frequency EX_time (x/120)
);

2


L_P_F
C_nov


241




Register setting




frame_rate<60




CM
row_average
CDSx2
single_path
1






Wcw
Wrd
cf
rf








Key in Register






L_P_F
Ny
Ne
241





&YQPTVSF
5JN
\
< -1'

/Z>

U@MJOF


/F
^

1YDML

t_line


2. t_line = (active_line_pixel + t_nov + 12) = 322 + 486 + 12 = 820 Pxclk
t_nov = 480 +Cov Pxclk = 486 Pxclk
3. Ny = INT[(L_P_F+3) - (( EX_Time * Pxclk ) / t_line)]
0 = INT [(241 + 3 ) - (( 2/120 * 12 M ) / 820 )]
4.Ne = Res[(L_P_F + 3) - (( EX_Time * Pixel_clk ) / t_line)] * active_line_pixel
31 = Res[(241 +3) - (( 2/120 *12 M ) / 820 )] * 322

5. Frame rate =
1
= 1/(241+3)* 820 = 60
(LPF +1+ 2) ⋅t _ line
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PixArt Imaging Inc.
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