STV-6410-R01 datasheet(52/105 Pages) STMICROELECTRONICS

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VV5410 & VV6410

Digital Video Interface Format

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8.8.2

Low-Power Mode (Figure 30)

Under the control of the serial interface the sensor analog circuitry can be powered down and then repowered. When the low-

power bit is set via the serial interface, all the data bus lines will go high at the end of the end of frame line of the current frame.

At this point the analog circuits in the sensor will power down. The system clock must remain active for the duration of low power

mode.

During low power mode only the analog circuits are powered down, the values of the serial interface registers e.g. exposure and

gain are preserved. The internal frame timing is reset to the start of a video frame on exiting low-power mode. In a similar manner

to the previous section, the first frame after the serial comms contains a continuous stream of alternating 9H and 6H - or

equivalent for the alternative ouput databus widths - to allow the host to re-confirm its sampling position. Then three frames later

the first start of frame line is generated.

8.8.3

Sleep Mode

Sleep mode is similar to the low-power mode, except that analog circuitry remains powered. When the sleep command is

received via the serial interface the pixel array will be put into reset and the data lines all will go high at the end of the current

frame. Again the system clock must remain active for the duration of sleep mode.

When sleep mode is disabled, the CMOS sensor’s frame timing is reset to the start of a frame. During the first frame after exiting

from sleep mode the data bus will remain high, while the exposure value propagates through the pixel array. At the start of the

second frame the first start of field line will be generated.

8.8.4

System clock status during sensor low-power modes

To allow the sensor to enter and exit the low power and sleep modes the system clock, CLKI, must be active.

8.9

Suspend mode

Under the control of the SUSPEND pin VV5410/VV6410 can be forced into an ultra low power mode. The sensor will consume

less than 80uA of current while suspended. While the sensor is in this mode video output is turned off and no serial

communications can occur.

The SUSPEND mode is effectively identical to a power on reset - all the video timing blocks within the sensor are reset as are the

contents of the serial interface, therefore the user will have to perform a compete reconfiguration of the device on exitting

SUSPEND. The sensor will also repeat the full 4 field power up sequence.

8.10 Data Qualiﬁcation Clock, QCK

VV5410/VV6410 provides a data qualification clock, (see Figure 31), to qualify the information output on data bus. The sensor

can generate two styles of qualification clock:

•

Fast QCK, clocks at nibble rate. The falling edge of this clock qualifies data

Mode

10-bit Value

Output Data Bus Pattern

4-Wire

258H

9H/6H (10012/01102)

5-Wire

136H

09H/16H (010012/101102)

8-Wire

096H / 069H

25H/1AH (001001012/000110102)

Table 16 : Output Data Bus Patterns for determination of Best Sampling Position

Mode

Description

Approx. Sensor Current

Suspend

Sensor in lowest power state. Suspend has been

asserted by host.

c.80uA

Table 17 : VV5410/VV6410 suspend mode power consumption

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