VS6663CC Datasheet, PDF (20/63 Pages) STMicroelectronics – 1.3 megapixel camera module

Functional description
VS6663CC
3.2.4
3.2.5
3.2.6
Note:
3.2.7
3.2.8
Power-off
The power-off state is defined as either or both of the digital and analog supplies not
present.
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
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).
After a soft reset or the transition of XSHUTDOWN to high, all registers are returned to their
default values.
Streaming
The VS6663CC streams live video. This mode is entered by writing 0x01 to the mode
control register (0x0100).
Dark calibration algorithm
VS6663CC 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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Doc ID028526 Rev 1