CMV2000 datasheet(31/64 Pages) AMSCO

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Reference: CMV2000-datasheet-v3.8

CMV2000 v3 Datasheet

Page 30 of 63

FRAME_REQ

T_EXP1

T_EXP2

Exposure time even rows

Exposure time odd rows

FIGURE 34: INTERLEAVED READ-OUT IN EXTERNAL EXPOSURE MODE

When a color sensor is used, the sequencer should be programmed to make sure it takes the Bayer pattern into account

when doing interleaved read-out. This can be done by setting the appropriate register to ‘0’.

Color/mono

Default value

Description of the value

mono

39[0]

0: color sensor is used

1: monochrome sensor is used

5.2.2 PIECEWISE LINEAR RESPONSE

The CMV2000 has the possibility to achieve a high optical dynamic range by using a piecewise linear response. This will

clip illuminated pixels which reach a programmable voltage, while leaving the darker pixels untouched. The clipping

level can be adjusted 2 times within one exposure time to achieve a maximum of 3 slopes in the response curve, as

described in Figure 35.

Vhigh

Vlow3

Vlow2

Vlow1

Total exposure time

Exposure kneepoint 2

Pixel reset

Pixel sample

Exposure kneepoint 1

FIGURE 35: PIECEWISE LINEAR RESPONSE DETAILS

The red lines represent a pixel on which a large amount of light is falling. The blue line represents a pixel on which less

light is falling. The bright pixel is held to a programmable voltage for a programmable time during the exposure time,

two times in a row. This makes sure that at the end of the exposure the pixel is not saturated. The darker pixel is not

influenced and will have a normal response. The Vlow voltages and different exposure times are programmable in the

is controlled by the Vlow voltage, while the slope of the segments is controlled by the programmed exposure times.

CMV2000 Datasheet(PDF) 31 Page - ams AG