MT9V024_17 datasheet(23/40 Pages) ONSEMI

Numer części	MT9V024

Szczegółowy opis	1/3-Inch Wide VGA CMOS Digital Image Sensor

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MT9V024/D

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5 LSB of the result. The 10−bit result is subtracted from each

pixel value on the row in turn. In addition, a positive constant

will be added (Reg0x71, bits 7:0). This constant should be

set to the dark level targeted by the black level algorithm plus

the noise expected on the measurements of the averaged

values from dark columns; it is meant to prevent clipping

from negative noise fluctuations.

Pixel value + ADC value * dark column average ) R0x71[9 : 0]

(eq. 20)

Note that this algorithm does not work in color sensor.

Automatic Gain Control and Automatic Exposure

Control

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 coarse and fine shutter

width registers. When AGC is disabled (R0xAF[1] = 0), the

sensor uses the manual gain value in R0x35 or R0x36. See

“Pixel Integration Control” for more information.

MAX. EXPOSURE

(R6xBD)

DESIRED BIN

(desired luminance)

(R0xA5)

MAX. GAIN

(R0x36)

EXP. LPF

(R6xA8)

EXP. SKIP

(R0xA6)

MANUAL EXP.

(R0x08)

AEC ENABLE

(R0Xaf[0])

To exposure

timing control

To analog

gain control

R0xBA

AEC

OUTPUT

R0xBB

AGC OUTPUT

MIN GAIN

MIN EXP

GAIN LPF

(R0xAB)

GAIN SKIP

(R0xA9)

MANUAL GAIN

(R0x35)

AGC ENABLE

(R0xAF[1])

AEC

UNIT

HISTOGRAM

GENERATOR

UNIT

AGC

UNIT

1

16

Figure 29. Controllable and Observable AEC/AGC Registers

0

1

0

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), the maximum auto

exposure value is limited by R0xBD; minimum auto

exposure is limited by AEC Minimum Exposure, R0xAC.

NOTE: AEC does not support sub−row timing;

calculated exposure values are rounded down to

the nearest row−time. For smoother response,

manual control is recommended for short

exposure times.

When AGC is enabled (R0xAF), the maximum auto gain

value is limited by R0xAB; 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. All pixels are used,

whether in color or mono mode. The desired exposure and

gain are then calculated from this for subsequent frame.

When binning is enabled, tuning of the AEC may be

required. The histogram pixel count register, R0xB0, may be

adjusted to reflect reduced pixel count. Desired bin register,

R0xA5, may be adjusted as required.

Pixel Clock Speed

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 or R0x0E, 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” and “Column Binning” for additional

information.

Hard Reset of Logic

The RC circuit for the MT9V024 uses a 10 k

W resistor and

a 0.1

mF capacitor. The rise time for the RC circuit is 1 ms

maximum.

Soft Reset of Logic

Soft reset of logic is controlled by:

• R0x0C Reset

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