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CSG14K_CSG8K

Functional Description

Datasheet

• PUBLIC

DS000571

• v1-00 • 2020-Dec-15

112

│ 44

Figure 45:

Timing Diagram: Triggered Internal Mode

In the example, the programmed 'frame time' is longer than the sum of GLOB length and READOUT

length. This situation is allowed and provides an easy mechanism to fine-tune frame rate.

In the most extreme case, the programmed frame time exactly matches the minimum length of the

GLOB and READOUT phases together. This will start a new GLOB period as soon as the previous

READOUT is finished, which results in the maximum frame rate for given GLOB and READOUT

settings.

Because this mode is internally controlled based on register settings, there are no invalid control

timing conditions. Invalid register settings do exist (for example: frame time shorter than

GLOB+READOUT length), but these are specified in the relevant sections describing those registers

later in this document.

The table below lists the special timing conditions of this mode.

Figure 46:

Triggered Internal Mode: Special Control Timing

Special Control Timing

Sensor Response

TI_s0

REQ_EXP before last READOUT of

sequence has started

Will do nothing else than increase the sequence length (add the number

of frames of the new request to the total length of this sequence, with a

maximum total of 255 frames).

TI_s1

REQ_EXP after last READOUT of

sequence has started

Will initiate a new 'first' EXPOSURE, followed by a complete new

sequence. Depending on the timing of the new request, the frame rate

may be temporally change. See below.

TI_s2

Any pulse on REQ_FRAME

Will be ignored

The behavior in case of TI_s1 depends on the relation between (1) the programmed exposure time of

the new request and (2) the time remaining to complete the active frame (see last 'Frame time' in

Figure 45).

●

If (1) < (2):

●

The start of the new EXPOSURE will be delayed.

●

It will be started at the correct moment so its end will coincide with the end of the active

frame.

EXPOSURE (2)

EXPOSURE (1)

REQ_EXP

SENSOR STATE

EXPOSURE (0)

IDLE

GLOB

READOUT (0)

GLOB

READOUT (1)

GLOB

IDLE

READOUT (2)

Frame time

Exposure time

ExpDelay

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