VS6663CD datasheet(21/64 Pages) STMICROELECTRONICS

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VS6663CD

Functional description

3.2.4

Power-off

The power-off state is defined as either or both of the digital and analog supplies not

present.

3.2.5

Hardware standby

This is the lowest power consumption mode. CCI communications are not supported in this

mode. The PLL and the video blocks are powered down. This state is entered by pulling the

control pin XSHUTDOWN down (active low). All registers are returned to their default values

3.2.6

Software standby

Software standby mode preserves the contents of the CCI register map. CCI

communications are supported in this mode. The software standby mode is selected using a

serial interface command. If this state is entered from hardware standby the data pads

remain high impedance. If this state is entered from streaming then the data pads go high

impedance at the end of the current frame. The internal video timing is reset to the start of a

video frame in preparation for the enabling of active video. The values of the serial interface

registers like exposure and gain are preserved. The system clock must remain active when

communicating with the sensor.

This state is entered by releasing the device from hard reset by setting XSHUTDOWN high,

writing 0x00 to the mode control register (0x0100) or commanding a soft reset by writing

0x01 to the software reset register (0x0103).

Note:

After a soft reset or the transition of XSHUTDOWN to high, all registers are returned to their

default values.

3.2.7

Streaming

The VS6663CD streams live video. This mode is entered by writing 0x01 to the mode

control register (0x0100).

3.2.8

Dark calibration algorithm

VS6663CD runs an automatic dark calibration algorithm on the raw image data to control

the video offsets caused by dark current. This ensures that a high quality image is output

over a range of operating conditions. First frame dark level is correctly calibrated, for

subsequent frames the adjustment of the dark level is damped by a leaky integrator function

to avoid possible frame to frame flicker.

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