MT9V022I77ATC Aptina LLC, MT9V022I77ATC Datasheet - Page 32

• Manufacturer Part Number: MT9V022I77ATC
• Description: IC SENSOR IMAGE VGA COLOR 52IBGA
• Manufacturer: Aptina LLC
• Type: CMOS Imagingr
• Series: DigitalClarity®r

Specifications of MT9V022I77ATC

• Pixel Size: 6µm x 6µm
• Active Pixel Array: 752H x 480V
• Frames Per Second: 60
• Voltage - Supply: 3.3V
• Package / Case: 52-IBGA
• Sensor Image Color Type: Color
• Sensor Image Size Range: 250,920 to 480,000Pixels
• Sensor Image Size: 752x480Pixels
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -40C to 85C
• Package Type: IBGA
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 52
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 557-1267; MT9V022I77ATC

Automatic Gain Control and Automatic Exposure Control
Figure 27:
Pixel Clock Speed
PDF: 3295348826/Source:7478516499
MT9V022_DS - Rev.H 6/10 EN
Controllable and Observable AEC/AGC Registers
The integrated AEC/AGC unit is responsible for ensuring that optimal auto settings of
exposure and (analog) gain are computed and updated every frame.
AEC and AGC can be individually enabled or disabled by R0xAF. When AEC is disabled
(R0xAF[0] = 0), the sensor uses the manual exposure value in R0x0B. When AGC is
disabled (R0xAF[1] = 0), the sensor uses the manual gain value in R0x35. See Aptina
Technical Note TN-09-17, “MT9V022 AEC and AGC Functions,” for further details.
The exposure is measured in row-time by reading R0xBB. The exposure range is
1 to 2047. The gain is measured in gain-units by reading R0xBA. The gain range is
16 to 63 (unity gain = 16 gain-units; multiply by 1/16 to get the true gain).
When AEC is enabled (R0xAF[0] = 1), the maximum auto exposure value is limited by
R0xBD; minimum auto exposure is fixed at 1 row.
When AGC is enabled (R0xAF[1] = 1), the maximum auto gain value is limited by R0x36;
minimum auto gain is fixed to 16 gain-units.
The exposure control measures current scene luminosity and desired output luminosity
by accumulating a histogram of pixel values while reading out a frame. The desired
exposure and gain are then calculated from this for subsequent frame.
The pixel clock speed is same as the master clock (SYSCLK) at 26.66 MHz by default.
However, when column binning 2 or 4 (R0x0D, bit 2 or 3) is enabled, the pixel clock
speed is reduced by half and one-fourth of the master clock speed respectively. See
“Read Mode Options” on page 34 and “Column Binning” on page 35 for additional infor-
mation.
(desired luminance)
MAX. EXPOSURE
DESIRED BIN
MAX. GAIN
(R0xBD)
(R0x36)
(R0xA5)
16
1
MIN GAIN
MIN EXP.
GAIN LPF
(R0xAB)
EXP. LPF
(R0xA8)
32
MT9V022: 1/3-Inch Wide-VGA Digital Image Sensor
GAIN SKIP
UNIT
UNIT
AEC
AGC
EXP. SKIP
(R0xA9)
(R0xA6)
HISTOGRAM
GENERATOR
UNIT
MANUAL GAIN
MANUAL EXP.
AGC OUTPUT
(R0x0B)
(R0x35)
OUTPUT
Aptina reserves the right to change products or specifications without notice.
AEC
AGC ENABLE
©2005 Aptina Imaging Corporation. All rights reserved.
(R0xAF[1])
AEC ENABLE
0
1
1
0
(R0xAF[0])
timing control
gain control
Feature Description
To exposure
To analog
R0xBA
R0xBB