mt9v034c12stmdes aptina, mt9v034c12stmdes Datasheet - Page 55

• Manufacturer Part Number: mt9v034c12stmdes
• Description: 1/3-inch Wide-vga Cmos Digital Image Sensor
• Manufacturer: aptina

Figure 22:
PDF: 09005aef8366edcb/Source: 09005aef8366ede5
MT9V034_DS - Rev. A 10/08 EN
Sequence of Voltages in a Piecewise Linear Pixel Response
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. Typi-
cally,
shortest for the first slope, providing the highest sensitivity.
The register settings for V_Step and partial exposures are:
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 MT9V034 calculates
the knee points automatically using the following equations:
As a default for auto exposure,
When the auto adjust enabler is disabled (set LOW),
through the two-wire serial interface:
t
t
t
1 = Coarse SW1 (row-times) + Fine SW1 (pixel-times)
2 = Coarse SW2 – Coarse SW1 + Fine SW2 - Fine SW1
3 = Total Integration –
= Coarse Total Shutter Width + Fine Shutter Width Total –
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)
t
INT =
t
1 is the longest exposure,
1/t
t2 = tINT x (½)R0x0A[3:0] or R0xD1[3:0]
t3 = tINT x (½)R0x0A[7:4] or R0xD1[7:4]
1
t
1 +
t
2 +
Aptina Confidential and Proprietary
t
3
dV1
t
1 =
1/t
2
t
1 –
t
INT –
t
2
55
t
2 –
t
t
2 is 1/16 of
2 shorter, and so on. Thus the range of light intensities is
t
MT9V034: 1/3-Inch Wide-VGA Digital Image Sensor
3
dV2
Light Intensity
1/t
3
t
INT,
t
3 is 1/64 of
Aptina Imaging reserves the right to change products or specifications without notice.
t
1,
dV3
t
2, and
t
t
1 –
INT.
t
©2008 Aptina Imaging Corporation. All rights reserved.
3 may be programmed
t
2
Feature Description
(EQ 10)
(EQ 5)
(EQ 6)
(EQ 7)
(EQ 8)
(EQ 9)