MT9V024 datasheet(35/62 Pages) ONSEMI

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MT9V024_DSRev. G Pub. 4/15 EN

©Semiconductor Components Industries, LLC, 2015.

MT9V024: 1/3-Inch Wide-VGA Digital Image Sensor

Feature Description

Analog Gain

Analog gain is controlled by:

• R0x35 Global Gain context A

• R0x36 Global Gain context B

The formula for gain setting is:

Gain = Bits[6:0] x 0.0625

(EQ 17)

The analog gain range supported in the MT9V024 is 1X–4X with a step size of

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.

Analog gain = bits (6:0) x 0.0625 for values 16–31

Analog gain = bits (6:0)/2 x 0.125 for values 32–64

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.

Digital Gain

Digital gain is controlled by:

• R0x99-R0xA4 Tile Coordinates

• R0x80-R0x98 Tiled Digital Gain and Weight

In the MT9V024, the gain logic divides the image into 25 tiles, as shown in Figure 27 on

page 31. The size and gain of each tile can be adjusted using the above digital gain

control registers. Separate tile gains can be assigned for context A and context B.

Registers 0x99–0x9E and 0x9F–0xA4 represent the coordinates X0/5–X5/5 and Y0/5–Y5/5

in Figure 27 on page 31, respectively.

Digital gains of registers 0x80–0x98 apply to their corresponding tiles. The MT9V024

supports a digital gain of 0.25–3.75X.

When binning is enabled, the tile offsets maintain their absolute values; that is, tile coor-

dinates do not scale with row or column bin setting. Digital gain is applied as soon as

Note:

There is one exception, for the condition when Column Bin 4 is enabled (R0x0D[3:2]

or R0x0E[3:2] = 2). For this case, the value for Digital Tile Coordinate

X–direction must be doubled.

The formula for digital gain setting is:

Digital Gain = Bits[3:0] x 0.25

(EQ 18)

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