XGS datasheet(21/53 Pages) ONSEMI

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XGS Family

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INTEGRATION MODES

In a global shutter sensor, light integration takes place on

all pixels in parallel, although subsequent readout is

sequential. Figure 14 shows the integration and readout

sequence for the global shutter. All pixels are light sensitive

during the same period of time.

Figure 14. Global Shutter Operation

Time

Integration Time

Burst

Readout

Time

Common Reset

(SFOT)

Common Sample & Hold

(EFOT)

Progressive read,

line by line

(ROT + readout)

The whole pixel core is reset simultaneously and after the

integration time all pixel values are sampled at the same time

on the storage node inside each pixel. The pixel core is read

out line by line after integration. Note that Figure 14 shows

a configuration where integration and readout operations are

not pipelined. In a pipelined configuration, integration and

readout are performed simultaneously.

Pipelined Global Shutter Mode

In pipelined shutter mode, the integration and readout are

active concurrently. Images are continuously read and

integration of frame N is ongoing during readout of the

previous frame N−1. The readout of every frame starts with

a Frame Overhead time (EFOT), during which the analog

value on the pixel diode is transferred to the pixel memory

element. After the Frame Overhead Time, the sensor is read

out line per line. Image array operations and readout are

pipelined. The image array operations are performed in the

Row Overhead Time (ROT). During the ROT sequence, an

image row is selected for readout.

At the start of the integration the sequencer schedules

another global operation on the pixel array. This sequence is

referred to as Start of integration frame overhead sequence

(SFOT). During this SFOT, the readout shall be halted

temporarily.

MASTER MODE (NON−TRIGGERED)

Figure 15. Master Mode (non−Triggered)

In this operation mode, the integration time is set through

the register interface and the sensor integrates and reads out

the images autonomously. The sensor acquires images

without any user interaction as shown in Figure 15.

On a high level, the frame time consists of a

non−integrating time and integration time (during which the

pixels are light sensitive and integrating light). The sum of

both parameters is the frame time, which is configured in

multiple of line periods. Within this total frame time, the

Sequencer schedules the frame operations required to

initiate and terminate the light integration. The integration

period is started with a Start−of−Integration FOT (SFOT)

sequence and is ended with an End−of−Integration FOT

(EFOT) sequence. Note that both SFOT and EFOT

operations take some time during which the readout will be

halted. This will be reflected in an idle period on the sensor’s

interface. The parameters defining the frame and integration

properties are listed in Table 9 below.

XGS Datasheet(PDF) 21 Page - ON Semiconductor

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