mt9v034c12stmdes aptina, mt9v034c12stmdes Datasheet - Page 54

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

Exposure Indicator
High Dynamic Range
Figure 21:
PDF: 09005aef8366edcb/Source: 09005aef8366ede5
MT9V034_DS - Rev. A 10/08 EN
High Dynamic Enable
Shutter Width 1
Shutter Width 2
Shutter Width Control
V_Step Voltages
Sequence of Control Voltages at the HDR Gate
The exposure indicator is controlled by:
• R0x1B LED_OUT Control
The MT9V034 provides an output pin, LED_OUT, to indicate when the exposure takes
place. When R0x1B bit 0 is clear, LED_OUT is HIGH during exposure. By using R0x1B, bit
1, the polarity of the LED_OUT pin can be inverted.
High dynamic range is controlled by:
In the MT9V034, high dynamic range (by setting R0x0F, bit 0 or 8 to 1) is achieved by
controlling the saturation level of the pixel (HDR or high dynamic range gate) during the
exposure period. The sequence of the control voltages at the HDR gate is shown in
Figure 21. After the pixels are reset, the step voltage, V_Step, which is applied to HDR
gate, is set up at V1 for integration time t
finally it is parked at V4, which also serves as an antiblooming voltage for the photode-
tector. This sequence of voltages leads to a piecewise linear pixel response, illustrated
(approximately) in Figure 21 and Figure 22 on page 55.
Voltage
HDR
Aptina Confidential and Proprietary
V
AA
(3.3V)
R0x31-R0x34
Context A
R0x0F[0]
R0x08
R0x0A
R0x09
t
1
54
V1~1.4V
MT9V034: 1/3-Inch Wide-VGA Digital Image Sensor
1,
then to V2 for time t
Exposure
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V2~1.2V
t
2
2
©2008 Aptina Imaging Corporation. All rights reserved.
, then V3 for time t
R0x39-R0x3C
V3~1.0V
Context B
t
R0x0F[8]
3
R0xD0
R0xD1
R0xCF
Feature Description
V4~0.8V
3
, and