MT9V024 datasheet(32/62 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

Figure 24:

Sequence of Voltages in a Piecewise Linear Pixel Response

The parameters of the step voltage V_Step, which take values V1, V2, and V3, directly

affect the position of the knee points in Figure 24.

Light intensities work approximately as a reciprocal of the partial exposure time. Typi-

cally, t1 is the longest exposure, t2 shorter, and so on. Thus the range of light intensities is

shortest for the first slope, providing the highest sensitivity.

The register settings for V_Step and partial exposures are:

V1 = R0x31, bits 5:0 (Context B: R0x39, bits 5:0)

V2 = R0x32, bits 5:0 (Context B: R0x3A, bits 5:0)

V3 = R0x33, bits 5:0 (Context B: R0x3B, bits 5:0)

V4 = R0x34, bits 5:0 (Context B: R0x3C, bits 5:0)

tINT = t1 + t2 + t3

There are two ways to specify the knee points timing, the first by manual setting and the

second by automatic knee point adjustment. Knee point auto adjust is controlled for

context A by R0x0A[8] (where default is ON), and for context B by R0xD1[8] (where

default is OFF ).

When the knee point auto adjust enabler is enabled (set HIGH), the MT9V024 calculates

the knee points automatically using the following equations:

t1 = tINT – t2 – t3

(EQ 5)

t2 = tINT x (½)

R0x0A[3:0] or R0xD1[3:0]

(EQ 6)

t3 = tINT x (½)

R0x0A[7:4] or R0xD1[7:4]

(EQ 7)

As a default for auto exposure, t2 is 1/16 of tINT, t3 is 1/64 of tINT.

When the auto adjust enabler is disabled (set LOW), t1, t2, and t3 may be programmed

through the two-wire serial interface:

t1 = Coarse SW1 (row-times) + Fine SW1 (pixel-times)

(EQ 8)

t2 = Coarse SW2 – Coarse SW1 + Fine SW2 - Fine SW1

(EQ 9)

t3 = Total Integration – t1 – t2

(EQ 10)

= Coarse Total Shutter Width + Fine Shutter Width Total – t1 – t2

dV1

dV2

dV3

1/t1

1/t2

1/t3

Light Intensity

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