mt9v032 aptina, mt9v032 Datasheet - Page 46

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

Gain Settings
Changes to Gain Settings
Figure 24:
Analog Gain
PDF: 6538045704/Source:2194051501
MT9V022_DS - Rev. C 9/10 EN
Latency of Analog Gain Change When AGC Is Disabled
When the digital gain settings (R0x80
next frame start. However, the latency for an analog gain change to take effect depends
on the automatic gain control.
If automatic gain control is enabled (R0xAF, bit 1 is set to HIGH), the gain changed for
frame n first appears in frame (n + 1); if the automatic gain control is disabled, the gain
changed for frame n first appears in frame (n + 2).
Both analog and digital gain change regardless of whether the integration time is also
changed simultaneously.
Analog gain is controlled by:
• R0x35 global gain
The formula for gain setting is:
The analog gain range supported in the MT9V032 is 1X
6.25 percent. To control gain manually with this register, the sensor must NOT be in AGC
mode. When adjusting the luminosity of an image, it is recommended to alter exposure
first and yield to gain increases only when the exposure value has reached a maximum
limit.
For values 16–31: each LSB increases analog gain 0.0625v/v. A value of 16 = 1X gain.
Range: 1X to 1.9375X.
For values 32–64: each 2 LSB increases analog gain 0.125v/v (that is, double the gain
increase for 2 LSB). Range: 2X to 4X. Odd values do not result in gain increases; the gain
increases by 0.125 for values 32, 34, 36, and so on.
Analog gain = bits (6:0)/2 x 0.125 for values 32–64
Analog gain = bits (6:0) x 0.0625 for values 16–31
FRAME_VALID
Programmed
Image Data
New Gain
Actual
Gain
Frame Start
Gain = Bits[6:0] x 0.0625
47
Gain = 3.0X
MT9V032: 1/3-Inch Wide-VGA Digital Image Sensor
–
R0x98) are changed, the gain is updated on the
Output image with
Gain = 3.0X
Gain = 3.0X
Aptina reserves the right to change products or specifications without notice.
–
Gain = 3.5X
4X with a step size of
©2005 Aptina Imaging Corporation. All rights reserved.
Output
image with
Gain = 3.5X
Feature Description
Gain = 3.5X
(EQ 10)
(EQ 8)
(EQ 9)