CMV2000 datasheet(21/64 Pages) AMSCO

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Reference: CMV2000-datasheet-v3.8

CMV2000 v3 Datasheet

Page 20 of 63

When the exposure time is shorter than the read-out time, the FOT and read-out of the next frame will start immediately

after the read-out of the previous frame. Keep in mind that the next FRAME_REQ pulse has to occur after the FOT of

the current frame. For an exact calculation of the exposure time see Chapter 5.1. When a new FRAME_REQ is applied,

the exposure of the next frame will be delayed so that the FOT begins right after the read-out time of the current frame.

FRAME_REQ

Frame1_cycle

FOT

Read-out time

Exposure time

Frame2_cycle

FOT

Read-out time

Exposure time

FIGURE 15: REQUEST FOR 2 FRAMES IN INTERNAL EXPOSURE MODE WITH EXPOSURE TIME < READ-OUT TIME

FRAME_REQ

Frame1_cycle

FOT

Read-out time

Exposure time

Frame2_cycle

FOT

Read-out time

Exposure time

FIGURE 16: TWO REQUESTS FOR 1 FRAME IN INTERNAL EXPOSURE MODE

3.10.2 EXTERNAL EXPOSURE TIME

The exposure time can also be programmed externally by using the T_EXP1 input pin. This mode can be enabled by

setting the register address 41. In this mode, the exposure starts when a high state is detected on the T_EXP1 pin. When

a high state is detected on the FRAME_REQ input, the exposure time stops and the read-out will start automatically. A

new exposure starts by sending a pulse to the T_EXP1 pin during or after the read-out of the previous frame. The

minimum time between T_EXP and FRAME_REQ is 1 master clock cycle and between FRAME_REQ and T_EXP is FOT.

For an exact calculation of the exposure time see Chapter 5.1.

FRAME_REQ

Exposure time

Frame1_cycle

FOT

Read-out time

Exposure time

Frame2_cycle

FOT

Read-out time

T_EXP1

FIGURE 17: REQUEST FOR 2 FRAMES USING EXTERNAL-EXPOSURE-TIME MODEREADING OUT THE SENSOR

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