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MT9V023 Arkusz danych(PDF) 21 Page - ON Semiconductor

Numer części MT9V023
Szczegółowy opis  1/3-Inch Wide?륷GA CMOS Digital Image Sensor
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
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MT9V023 Arkusz danych(HTML) 21 Page - ON Semiconductor

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MT9V023
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21
Figure 21. Sequence of Control Voltages at the HDR Gate
t2
t3
V4~0.8V
Exposure
t1
HDR
Voltage
VAA (3.3V)
V1~1.4V
V2~1.2V
V3~1.0V
Figure 22. Sequence of Voltages in a Piecewise Linear Pixel Response
dV1
dV2
dV3
1/t
1
1/t
2
1/t
3
Light Intensity
The parameters of the step voltage V_Step which takes
values V1, V2, and V3 directly affect the position of the knee
points in Figure 22.
Light intensities work approximately as a reciprocal of the
partial exposure time. Typically, t1 is the longest exposure,
t2 shorter, and so on. Thus the range of light intensities is
shortest for the first slope, providing the highest sensitivity.
The register settings for V_Step and partial exposures are:
V1 = R0x31, bits 5:0 (Context B: R0x39, bits 5:0)
V2 = R0x32, bits 5:0 (Context B: R0x3A, bits 5:0)
V3 = R0x33, bits 5:0 (Context B: R0x3B, bits 5:0)
V4 = R0x34, bits 5:0 (Context B: R0x3C, bits 5:0)
tINT = t1 + t2 + t3
There are two ways to specify the knee points timing, the
first by manual setting and the second by automatic knee
point adjustment. Knee point auto adjust is controlled for
context A by R0x0A[8] (where default is ON), and for
context B by R0xD1[8] (where default is OFF).
When the knee point auto adjust enabler is enabled (set
HIGH), the MT9V023 calculates the knee points
automatically using the following equations:
1 + INT * 2 * 3
(eq. 5)
t
tt
t
2 + INT x (1 2)R0x0A[3:0] or R0xD1[3:0]
(eq. 6)
t
t
2 + INT x (1 2)R0x0A[7:4] or R0xD1[7:4]
(eq. 7)
t
t
As a default for auto exposure, t2 is 1/16 of tINT, t3 is 1/64
of tINT.
When the auto adjust enabler is disabled (set LOW), t1, t2,
and t3 may be programmed
through the two-wire serial interface:
1 + Coarse SW1 (row * times) ) Fine SW1 (pixel * times)
(eq. 8)
t
2 + Coarse SW2 * Coarse SW1 ) Fine SW2 * Fine SW1
(eq. 9)
t
+ Coarse Total Shutter Width ) Fine Shutter Width Total * 1 * 2
(eq. 10)
t3 + Total Integration * 1 * 2
tt
tt
For context A these become:
1 + R0x08 ) R0xD3
(eq. 11)
t
2 + R0x09 * ROx08 ) R0xD4 * R0xD3
(eq. 12)
t
3 + R0x0B ) R0xD4 * 1 * 2
(eq. 13)
tt
t
For context B these are:
1 + R0xCF ) R0xD6
(eq. 14)
t
2 + R0xD0 * ROxCF ) R0xD7 * R0xD6
(eq. 15)
t
3 + R0xD2 ) R0xD8 * 1 * 2
(eq. 16)
tt
t


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