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MT9V024 데이터시트(PDF) 19 Page - ON Semiconductor

부품명 MT9V024
상세설명  1/3-Inch Wide VGA CMOS Digital Image Sensor
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제조업체  ONSEMI [ON Semiconductor]
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MT9V024 데이터시트(HTML) 19 Page - ON Semiconductor

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19
VAA(3.3V)
Figure 23. Sequence of Control Voltages at the HDR Gate
Exposure
HDR
Voltage
V1~1.4V
V2~1.2V
V3~1.0V
V4~0.8V
t1
t2
t3
VAA(3.3V)
V1~1.4V
V2~1.2V
V3~1.0V
t 1
t2
t 3
Light Intensity
dV1
dV2
dV3
1/t 1
1/t 22
1/t 3
Figure 24. Sequence of Voltages in a Piecewise Linear Pixel Response
The parameters of the step voltage V_Step, which take
values V1, V2, and V3, directly affect the position of the
knee points in Figure 24.
Light intensities work approximately as a reciprocal of the
partial exposure time. Typically, t1 is the longest exposure,
t
2 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 MT9V024 calculates the knee points
automatically using the following equations:
t1 + tINT * t2 * t3
(eq. 4)
t2 + tINTx(1 2)R0x0A[3:0]orR0xD1[3:0]
(eq. 5)
t3 + tINTx(1 2)R0x0A[7:4]orR0xD1[7:4]
(eq. 6)
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:
t1 + Coarse SW1(row * times) ) Fine SW1(pixel * times)
(eq. 7)
t2 + Coarse SW2 * Coarse SW1 ) Fine SW2 * Fine SW1
(eq. 8)
t3 + Total Integration * t1 * t2 + Coarse Total Shutter Width ) Fine Shutter Width Totall * t1 * t2
(eq. 9)
For context A these become:
t1 + R0x08 ) R0xD3
(eq. 10)
t3 + R0x09 * R0x08 ) R0xD4 * R0xD3
(eq. 11)
t3 + R0x0B ) R0xD4 * t1 * t2
(eq. 12)
For context B these are:
t1 + R0xCF ) R0xD6
(eq. 13)
t3 + R0xD0 * R0xCF ) R0xD7 * R0xD6
(eq. 14)
t3 + R0xD2 ) R0xD8 * t1 * t2
(eq. 15)


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