AR0141CS View Datasheet(PDF) - ON Semiconductor

Part Name

Description

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AR0141CS

1/4‐inch Digital Image Sensor

ON Semiconductor 

AR0141CS

Frame

Valid

VD Signal

Rising

Edge

Rising

Edge

Slave Mode

Trigger

Row 0

Inactive

Active

Rising edge of VD

signal triggers the start

of the frame readout.

Inactive

Row reset and read

operations begin

after the rising edge

of the VD signal.

Rising

Edge

Active

Row Reset

(start of integration)

Row Readout

Programmed Integration

Integration due to

Slave Mode Delay

Row N

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. .

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

Figure 27. Slave Mode Example with Equal Integration and Frame Readout Periods

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)

Frame

Valid

VD Signal

Rising

Edge

Rising

Edge

Rising

Edge

Slave Mode

Trigger

Row 0

Inactive

8.33 ms 8.33 ms

Active

Inactive

Active

Row reset and read

operations begin after

the rising edge of the

Vd signal.

Row Reset

(start of integration)

Row Readout

Programmed Integration

Integration due to

Slave Mode Delay

Row N

Note:

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

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.

Figure 28. Slave Mode Example Where the Integration Period is Half of the Frame Readout Period

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