NOIP1SN016KA datasheet(13/87 Pages) ONSEMI

13 / 87 page

NOIP1SN025KA, NOIP1SN016KA, NOIP1SN012KA, NOIP1SN010KA

www.onsemi.com

OPERATING MODES

Global Shutter Mode

The PYTHON operates in pipelined or triggered global

shutter modes. In this mode, light integration takes place on

all pixels in parallel, although subsequent readout is

sequential. Figure 10 shows the integration and readout

sequence for the global shutter mode. All pixels are light

sensitive at the same period of time. The whole pixel core is

reset simultaneously and after the integration time all pixel

values are sampled together on the storage node inside each

pixel. The pixel core is read out line by line after integration.

Note that the integration and readout can occur in parallel or

sequentially. The integration starts at a certain period,

relative to the frame start.

Pipelined Global Shutter Mode

In pipelined global shutter mode, the integration and

readout are done in parallel. 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 (FOT), during which the analog value

on the pixel diode is transferred to the pixel memory

element. After the FOT, the sensor is read out line by line and

the readout of each line is preceded by the row overhead time

(ROT). Figure 11 shows the exposure and readout time line

in pipelined global shutter mode.

Figure 10. Global Shutter Operation

Master Mode

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.

Slave Mode

The slave mode adds more manual control to the sensor.

The integration time registers are ignored in this mode and

the integration time is instead controlled by an external pin.

As soon as the control pin is asserted, the pixel array goes out

of reset and integration starts. The integration continues

until the user or system deasserts the external pin. Upon a

falling edge of the trigger input, the image is sampled and the

readout begins.

Figure 11. Pipelined Shutter Operation in Master Mode

Reset

Exposure Time N

Reset

N+1

Exposure Time N+1

Readout Frame N-1

FOT

Readout Frame N

FOT

Integration Time

Handling

Readout

Handling

ROT

Line Readout

FOT

Figure 12. Pipelined Shutter Operation in Slave Mode

Reset

Exposure Time N

Reset

N+1

Exposure T im e N+1

Readout N−1

FOT

Readout N

FOT

Integration Time

Handling

Readout

Handling

ROT

Line Readout

External Trigger

FOT

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