CHR71000 datasheet(26/54 Pages) AMSOSRAM

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CHR71000

Functional description

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7.3.2

Frame and line timing

A frame is a collection of lines, which in its turn is a collection of pixels. One line-readout

consists of a sampling period and a readout period. During the sampling period, all blocks on

the sensor are prepared for readout of the line: the column readout structures are initialized

and the pixel values (reset and signal) are copied into the columns. This operation is generally

called Row Overhead Time or ROT. When the ROT has finished, the pixel values that are

stored in the columns are read out sequentially. This sequence is repeated for every line in a

frame.

Before the readout of a frame can start, an integration period must have passed. During this

period, light integrates in the pixels. The integration time is specified as a number of line times.

Figure 13 shows the timing of reading out 1 frame of 4 lines with an integration time of 2 line

times.

Figure 13: Schematic representation of integration and readout

Because of the rolling shutter operation of the sensor, the integration of frame n+1 can happen

during the readout of frame n. Figure 14 shows the timing of reading out 2 frames of 4 lines

with an integration time of 2 line times.

Figure 14: Example of readout of 2 frames (4 lines) with 2 lines integration time

INTE 1

INTE 2

ROT 1

ROT 2

ROT 3

ROT 4

Frame Integration

Frame Readout

INTE 1

INTE 2

INTE 1

INTE 2

INTE 1

INTE 2

ROW 1

ROW 2

ROW 3

ROW 4

INTE 1

INTE 2

ROT 1

ROT 2

ROT 3

ROT 4

Frame 1 Integration

Frame 1 Readout

INTE 1

INTE 2

INTE 1

INTE 2

INTE 1

INTE 2

ROW 1

ROW 2

ROW 3

ROW 4

INTE 1

INTE 2

ROT 1

INTE 1

INTE 2

ROT 2

ROT 3

ROT 4

INTE 1

INTE 2

INTE 1

INTE 2

Frame 2 Integration

Frame 2 Readout

ROW 1

ROW 2

ROW 3

ROW 4

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