AR0141CS datasheet(13/48 Pages) ONSEMI

13 / 48 page

AR0141CS

www.onsemi.com

PIXEL SENSITIVITY

Figure 14. Integration Control in ERS Readout

Row Reset

(Start of Integration)

Row Readout

Row Integration

(TINTEGRATION)

A pixel’s integration time is defined by the number of

clock periods between a row’s reset and read operation. Both

the read followed by the reset operations occur within a row

period (TROW) where the read and reset may be applied to

different rows. The read and reset operations will be applied

to the rows of the pixel array in a consecutive order.

The coarse integration time is defined by the number of

row periods (TROW) between a row’s reset and the row read.

The row period is defined as the time between row read

operations (see Sensor Frame Rate).

TCOARSE + TROW

coarse_integration_time

(eq. 1)

Figure 15. Example of 8.33 ms Integration in 16.6 ms Frame

Vertical Blanking

Read

Reset

Vertical Blanking

TCOARSE = coarse_integration_time x TROW

8.33 ms = 563 rows x 22.2 μs/row

TFRAME = frame_length_lines x TROW

16.6 ms = 750 rows x 22.22 μs/row

Figure 16. Row Read and Row Reset Showing Fine Integration

TROW = line_length_pck × (1/CLK_PIX)

TFINE = fine_integration_time × (1/CLK_PIX)

Start of Read Row N + 1

and Reset Row K + 1

Start of Read Row N

and Reset Row K

Read Row N

Reset Row K

TFINE + fine_integration_time clk_pix

(eq. 2)

The maximum allowed value for fine_integration_time is:

line_length_pck * fine_integration_time_max_margin

(eq. 3)

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