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AR0330: 1/3-Inch CMOS Digital Image Sensor

Slave Mode

AR0330_DS Rev. U Pub. 4/15 EN

©Semiconductor Components Industries, LLC,2015.

Figure 37:

Slave Mode Example with Equal Integration and Frame Readout Periods

The integration of the last row is therefore 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).

Inactive

Active

Row 0

Row N

Inactive

Active

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.

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