CMV2000 datasheet(35/87 Pages) AMSOSRAM

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CMV2000

Functional description

Datasheet

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7.2.9

Requesting a frame

After starting up the sensor (see chapter 7.2.6), a number of frames can be requested by

sending a FRAME_REQ pulse. The number of frames can be set by programming the

appropriate register (addresses 70 and 71). The default number of frames to be grabbed is 1.

In internal-exposure-time mode, the exposure time will start after this FRAME_REQ pulse. In

the external-exposure-time mode, the read-out will start after the FRAME_REQ pulse. Both

modes are explained into detail in the chapters below.

7.2.9.1

Internal exposure control

In this mode, the exposure time is set by programming the appropriate registers (address 42-

44).

After the high state of the FRAME_REQ pulse is detected, the exposure time will start after a

delay of 133 clock cycles, see AN16

– Exposure timings for all timing details. When the

exposure time ends (as programmed in the registers), the pixels are being sampled and

prepared for read-out. This sequence is called the frame overhead time (FOT). Immediately

after the FOT, the frame is read-out automatically. If more than one frame is requested, the

exposure of the next frame starts already during the read-out of the previous one (see

Figure 24).

Figure 24: Request for 2 frames in internal- exposure-time mode

Figure 25: Two requests for 1 frame in internal exposure mode(1)

(1) This is This request form is just applicable to Version 3.

FRAME_REQ

Exposure time

Frame1_cycle

FOT

Read-out time

Exposure time

Frame2_cycle

FOT

Read-out time

FRAME_REQ

Exposure time

Frame1_cycle

FOT

Read-out time

Exposure time

Frame2_cycle

FOT

Read-out time

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