NOIV1SE2000A-QDC Datasheet, PDF (34/77 Pages) ON Semiconductor – VITA 2000 2.3 Megapixel 92 FPS Global Shutter CMOS Image Sensor

NOIV1SN2000A, NOIV2SN2000A
Multiple Slope Integration
‘Multiple Slope Integration’ is a method to increase the
dynamic range of the sensor. The VITA 2000 supports up to
three slopes.
Figure 25 shows the sensor response to light when the
sensor is used with one slope, two slopes, and three slopes.
The X-axis represents the light power; the Y-axis shows the
sensor output signal. The kneepoint of the multiple slope
curves are adjustable in both position and voltage level.
It is clear that when using only one slope (red curve), the
sensor has the same responsivity over the entire range, until
the output saturates at the point indicated with ‘single slope
saturation point’.
output
1023
`kneepoint 2'
slope 1     slope 2
To increase the dynamic range of the sensor, a second
slope is applied in the dual slope mode (green curve). The
sensor has the same responsivity in the black as for a single
slope, but from ‘knee point 1’ on, the sensor is less
responsive to incoming light. The result is that the saturation
point is at a higher light power level.
To further increase the dynamic range, a third slope can be
applied, resulting in a second knee point.
The multiple slope function is only available in global
shutter modes. Refer to section Global Shutter Mode on
page 29 for general notes applicable to the global shutter
operation and more particular to the use of the trigger0 pin.
slope 3
`kneepoint 1'
0
single slope
saturation point
dual slope
saturation point
Figure 25. Multiple Slope Operation
light
triple slope
saturation point
Required Register Uploads
Multiple slope integration requires the uploads as
described in the following table. Note that these are
cumulative with the required register uploads (Table 8).
These register uploads are subject to change.
Table 21. REQUIRED UPLOADS FOR MULTIPLE
SLOPE INTEGRATION
Upload # Address Data
Description
1
421
0x7030
Configure sequencer
2
429
0x7050
Configure sequencer
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