AR0141CS datasheet(25/48 Pages) ONSEMI

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AR0141CS

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When the slave mode becomes active, the sensor will

pause both row read and row reset operations. (Note: The

row integration period is defined as the period from row

reset to row read.) The frame−time should therefore be

configured so that the slave mode “wait period” is as short

as possible. In the case where the sensor integration time is

shorter than the frame time, the “wait period” will only

increase the integration of the rows that have been reset

following the last VD pulse.

The period between slave mode pulses must also be

greater than the frame period. If the rising edge of the VD

pulse arrives while the slave mode is inactive, the VD pulse

will be ignored and will wait until the next VD pulse has

arrived.

To enter slave mode:

1. While in soft−standby, set R0x30CE[4] = 1 to

enter slave mode

2. Enable the input pins (TRIGGER) by setting

R0x301A[8] = 1

3. Enable streaming by setting R0x301A[2] = 1

4. Apply sync−pulses to the TRIGGER input

FRAME READOUT

The sensor readout begins with vertical blanking rows

followed by the active rows. The frame readout period can

be defined by the number of row periods within a frame

(frame_length_lines) and the row period

(line_length_pck/clk_pix). The sensor will read the first

vertical blanking row at the beginning of the frame period

and the last active row at the end of the row period.

Figure 29. Example of the Sensor Output of a 1280 x 720 Frame at 60 fps

Active Rows

Vertical Blanking

Time

1/60s

End of Frame

Readout

End of Frame

Readout

Start of Vertical Blanking

Start of Frame

Start of Active Row

End of Line

Serial SYNC Codes

End of Frame

Row Reset

Row Read

Row Reset

Row Read

Frame Valid

Line Valid

1/60s

Row Reset

Row Read

Row Reset

Row Read

1280 x 720

HB (370 Pixels/Column)

Note:

The frame valid and line valid signals mentioned in this diagram represent internal signals within the sensor. The SYNC

codes represented in this diagram represent the HiSPi Streaming−SP protocol.

1280 x 720

HB (370 Pixels/Column)

Figure 29 aligns the frame integration and readout

operation to the sensor output. It also shows the sensor

output using the HiSPi Streaming−SP protocol. Different

sensor protocols will list different SYNC codes.

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