CMV300 datasheet(21/56 Pages) AMSOSRAM

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Reference:CMV300-datasheet-v2.11

CMV300 Datasheet

Page 19 of 54

FRAME_REQ

Frame1_cycle

FOT

Read-out time

Exposure time

Frame2_cycle

FOT

Read-out time

Exposure time

FIGURE 11: REQUEST FOR 2 FRAMES IN INTERNAL-EXPOSURE-TIME MODE WITH EXPOSURE TIME < READ-OUT TIME

3.10.2 EXTERNAL EXPOSURE CONTROL

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

by setting the appropriate register (address 41). In this case, 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 can start by sending a pulse to the T_EXP1 pin during or after the read-out of the previous

frame.

FRAME_REQ

Exposure time

Frame1_cycle

FOT

Read-out time

Exposure time

Frame2_cycle

FOT

Read-out time

T_EXP1

FIGURE 12: REQUEST FOR 2 FRAMES USING EXTERNAL-EXPOSURE-TIME MODE

3.10.3 EXPOSURE DELAY

In internal exposure mode, when reading out an image with an exposure time smaller than the number of lines read

out divided by the number outputs used, there will be increase in delay between the frame_req pulse and the actual

start of exposure. This delay is equal to:

exposure start delay = (196 * clk_per) + (

# lines

# sides

− inte_time)

With a minimum of 196 clk_in periods.

For example, when a complete image (488 lines) is read out with 2 sided outputs, and the integration time is 1 line time,

the delay will be 244.66 lines. When the integration time is 100 lines, the delay will be 145.66 lines.

Frame_req

INTE

READ OUT

INTE = < 244

INTE = 244

INTE = >244

FIGURE 13: EXPOSURE DELAY

If the integration time is longer than the readout time, the delay will always be the minimum. The 1st frame after a reset

will always have the minimum delay only.

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