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CSG14K_CSG8K

Functional Description

Datasheet

• PUBLIC

DS000571

• v1-00 • 2020-Dec-15

112

│ 36

Figure 33:

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 33, 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 34 shows the state diagram with the no

shutter lag.

EXPOSURE

GLOB

IDLE

RESET

READOUT

Actual

exposure

Δt = shutter

lag

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