LUPA-1300 Datasheet, PDF (17/48 Pages) Cypress Semiconductor – 1.3 M Pixel High Speed CMOS Image Sensor

LUPA-1300
Datasheet
3.4 Frame rate and windowing
3.4.1 Frame rate calculation
The frame period of the LUPA-1300 sensor can be calculated as follows:
Frame period = FOT + (Nr.Lns* (RBT + pixel period * Nr. Pxs / 16)
with:
edges).
FOT: Frame Overhead Time = 1 us.
Nr. Lns : Number of Lines read out each frame (Y).
Nr. Pxs: Number of pixels read out each line (X).
RBT: Row blanking time = 200 ns (nominal; can be further reduced).
Pixel period: clock_x period/2 (both rising and falling edge are active
- Example 1 read out of the full resolution at nominal speed (40 MHz pixel rate):
Frame period = 5 us + (1024 * (200 ns + 25 ns * 1280 / 16) = 2.25 ms => 444 fps.
- Example 2 read out of 800x600 at nominal speed (40 MHz pixel rate):
Frame period = 5 us + (600 * (200 ns + 25 ns * 800 / 16) = 871 us => 1148 fps.
- Example 3 read out of 640x480 at nominal speed (40 MHz pixel rate):
Frame period = 5 us + (480 * (200 ns + 25 ns * 640 / 16) = 577 us => 1733 fps.
- Example 4 read out of the full resolution at nominal speed (40 MHz pixel rate) with
reduced overhead time:
Frame period = 5 us + (1024 * (100 ns + 25 ns * 1280 / 16) = 2.15 ms => 465 fps.
3.4.2 X-Y addressing and windowing
The pixel array is readout by means of programmable X and Y shift registers. The
pixel array is scanned line-by-line and column-by-column. The starting point in X
and Y is defined individually for each register and is determined by the address
downloaded by the Serial – Parallel Interface (SPI). Both registers work in the same
way. A sync pulse that sets the address pointer to the starting address of each register,
initializes them. A clock pulse for the x- and y-shift register shifts the pointer
individually and makes sure that the sequential selection of the lines and columns is
correct.
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Contact [e-mail] Document # : 38-05711 Rev.**( Revision 3.1) Page 17 of 48