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CSG14K_CSG8K

Functional Description

Datasheet

• PUBLIC

DS000571

• v2-01 • 2023-Feb-10

113

│ 37

Figure 34:

State Diagram: Sequential Operation with Shutter Lag

The distinction is important because the EXPOSURE state is the direct response of external

control (through sensor I/O requests or register settings), but it is the actual exposure that

really matters to the user.

In the remainder of the document, when the concept of exposure or exposure time is

mentioned, it will always be about the EXPOSURE state, unless stated otherwise. The reader

should always bear in mind that the actual exposure is delayed in time with respect to this

EXPOSURE state due to the shutter lag mechanism.

In Figure 34, the shutter lag is shown under sequential operating conditions only, but note that

the shutter lag is present in all operation modes.

The shutter lag is always present at the end of the EXPOSURE period, since part of the

actual exposure time will always extend into the GLOB state. This is sometimes called

"exposure overlap". The shutter lag at the beginning of the EXPOSURE periods is introduced

artificially to compensate for this exposure overlap.

The shutter lag matching

can also be disabled to operate in “no shutter lag”-mode. In that

case, the sensor will move to the exposure state after a maximum internal latency of 33 *

tCLK_PIX when it receives an exposure request. The start of the actual exposure happens

together with the start of the exposure state. As a result, the length of the actual exposure

time is larger than the length of the EXPOSURE state (the exposure overlap is added).

Figure 35 shows the state diagram with the no shutter lag.

EXPOSURE

GLOB

IDLE

RESET

READOUT

Actual

exposure

Δt = shutter

lag

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