mt9v032 aptina, mt9v032 Datasheet - Page 43

• Manufacturer Part Number: mt9v032
• Description: 1/3-inch Wide-vga Cmos Digital Image Sensor
• Manufacturer: aptina

Figure 20:
Exposure Indicator
High Dynamic Range
PDF: 6538045704/Source:2194051501
MT9V022_DS - Rev. C 9/10 EN
Latency When Changing Integration
New Integration
The exposure indicator is controlled by:
• R0x1B LED_OUT control
The MT9V032 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:
• R0x08 shutter width 1
• R0x09 shutter width 2
• R0x0A shutter width control
• R0x31
In the MT9V032, high dynamic range (that is, R0x0F, bit 6 = 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
V4, which also serves as an antiblooming voltage for the photodetector. This sequence of
voltages leads to a piecewise linear pixel response, illustrated (in approximates) in
Figure 21 on page 45.
FRAME_VALID
Programmed
Image Data
Integration
LED_OUT
Actual
–
R0x34 V_Step voltages
Frame Start
1
then to V2 for time t
Int = 200 rows
44
Int = 200 rows
MT9V032: 1/3-Inch Wide-VGA Digital Image Sensor
2
Output image with
Int = 200 rows
, then V3 for time t
Int = 300 rows
Aptina reserves the right to change products or specifications without notice.
Int = 300 rows
3
, and finally it is parked at
©2005 Aptina Imaging Corporation. All rights reserved.
Output
image with
Int = 300
rows
Feature Description