AR0331 datasheet(30/52 Pages) ONSEMI

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AR0331

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Figure 30. Slave Mode Example with Equal Integration and Frame Readout Periods

Row 0

Row N

Rising

Edge

Rising

Edge

Row Readout

Programmed Integration

Integration due to

Slave Mode Delay

Slave Mode

Trigger

Rising edge of VD

signal triggers the start

of the frame readout.

Row Reset

(start of integration)

Frame

Valid

VD Signal

Rising

Edge

The Slave Mode will become “Active” after the last row period. Both the row reset and row read

operations will wait until the rising edge of the VD signal. .

Row reset and read

operations begin

after the rising edge

of the VD signal.

Active

Inactive

Note:

The integration of the last row is started before the end of the programmed integration for the first row.

The row shutter and read operations will stop when the

slave mode becomes active and is waiting for the VD signal.

The following should be considered when configuring the

sensor to use the slave mode:

1. The frame period (TFRAME) should be configured

to be less than the period of the input VD signal.

The sensor will disregard the input VD signal if it

appears before the frame readout is finished.

2. If the sensor integration time is configured to be

less than the frame period, then the sensor will not

have reset all of the sensor rows before it begins

waiting for the input VD signal. This error can be

minimized by configuring the frame period to be

as close as possible to the desired frame rate

(period between VD signals).

Figure 31. Slave Mode Example Where the Integration Period is Half of the Frame Readout Period

Row 0

Row N

Rising

Edge

Rising

Edge

Row Readout

Programmed Integration

Integration due to

Slave Mode Delay

Slave Mode

Trigger

Row Reset

(start of integration)

Frame

Valid

VD Signal

Rising

Edge

Reset operation is held during slave mode “Active” state.

Row reset and read

operations begin after

the rising edge of the

Vd signal.

8.33 ms 8.33 ms

Active

Inactive

Note:

The sensor read pointer will have paused at row 0 while the shutter pointer pauses at row N/2. The extra integration

caused by the slave mode delay will only be seen by rows 0 to N/2. The example below is for a frame readout

period of 16.6 ms while the integration time is configured to 8.33 ms.

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