Functional Description VV6501
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3.4 Device operating modes
3.4.1 Power-up
On power up the sensor is in low-power mode. All data bus lines drive high to indicate that the
device is “present”.
3.4.2 Waking up the sensor
The sensor is made to exit low power mode by enabling the external clock and writing to SIF
register16 bit 0. The first frame output after exiting low-power mode does not contain any valid video
data.
3.4.3 Low power mode
Entering low-power mode during video streaming causes the analogue circuits to be powered
down. The values of the serial interface registers is preserved.
Figure 21: Exiting low-power mode
0 1
D[4:0]
CLKIN
Frame
number
SDA
SCL
2
Start of frame line for the 1st
frame of valid video data.
Valid video data.
LP1
setup0[0]
LP1 D[4:0] are set to F
H
and the sensor analogue circuitry is
powered down.
LP2-LP3 “Exit low power mode” command.
Powers-up analogue circuits and initiates the 1 frame
start-up sequence
LP3-LP4 1 frame of alternating 9
H
& 6
H
data on D[4:0]
The sensor is being initialized during this frame.
One frame of 9
H
& 6
H
data.
F
H
9
H
,6
H
,9
H
,6
H
...
LP2
LP3
LP4
