AR0141CS datasheet(31/64 Pages) ONSEMI

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AR0141CS/D Rev. 6, 4/16 EN

©Semiconductor Components Industries, LLC, 2016.

AR0141CS: 1/4-Inch Digital Image Sensor

Slave Mode

Figure 28:

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

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

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

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.

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

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

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