VV5409C001 View Datasheet(PDF) - Vision

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VV5409C001

CIF Format Monochrome Digital Image Sensor

Vision 

VV5409 CMOS Monochrome Sensor Datasheet (Restricted) Rev 1.0

within the active lines. The pixel data may be separated from the line header and end-of-line control

sequence by a number of ‘blank’ bytes (07H) e.g. when the border lines and pixels are disabled 07H is output

in place of first 2 and last 2 pixels in a valid video line.

5.3.4 Start of frame line timing

The start of frame line which begins each video field contains no video data but instead contains the contents

of all the serial interface registers. This information follows the start-of-line header immediately and is

terminated by an end-of-line control sequence. To ensure that no escape/sync characters appear in the

sensor status/configuration information the code 07H is output after each serial interface value. Thus it takes

256 pixel clock periods (512 system clocks) to output all 128 of the serial interface registers. The remainder

of the 356 pixel periods of the video portion of the line is padded out using 07H values. The first two pixel

locations are also padded with 07H characters (Figure 5.16)

If a serial interface register location is unused then 07H is output.

5.3.5 End of frame line timing

The end of frame line which begins each video field contains no video data. Its sole purpose is to indicate the

end of a frame.

5.4 Detection of sensor using data bus state

The video processor device must have internal pull-down terminations on the data bus. On power-up a

sensor will pull all data lines high for a guaranteed period. This scheme allows the presence of a sensor on

the interface to be detected by the video processor on power-up, and the connection of a sensor to an already

power-up interface (a ‘hot’ connection).

The absence of a sensor is detected by the video processor seeing more than 32 consecutive nibbles of 0H

on the data bus. On detecting the absence of a sensor, CKI, should be disabled (held low).

The presence of a sensor is detected by the video processor seeing more than 32 consecutive nibbles of FH

on the data bus. On detecting the presence of a sensor, CKI, should be enabled.

5.5 Resetting the Sensor Via the Serial Interface

Bit 2 of setup register 0 allows the VV5409 sensor to be reset to its power-on state via the 2-wire serial

interface. Setting this “Soft Reset” bit causes all of the serial interface registers including the “Soft Reset” bit

to be reset to their default values. This “Soft Reset” leaves the sensor in low-power mode and thus an “Exit

Low-Power Mode” command (Table 6.7, Section 6.6.2) must be issued via the serial interface before the

sensor will start to generate video data (Figure 5.17).

5.6 Power-up, Low-power and Sleep modes

To clarify the state of the interface on power-up and in the case of a ‘hot’ connection of the interface cable

the power-up state of the bus is defined below.

PU0

System Power Up or Sensor Hot Plugged

PU1

Sensor Internal-on Reset Triggers, the sensor enters low power mode and D[3:0] is set

to FH.

PU2

Video Processor released from reset.

PU3

Video Processor enables the sensor clock, CLKI.

Table 5.5 : System Power-Up or Hot-plugging Device Behaviour

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VV5409 CMOS Monochrome Sensor Datasheet (Restricted) Rev 1.0

SR8

SR7

SR6

SR5

SR4

SR3

SR2

SR1

SR0

Commercial In Confidence

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