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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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MT9V023 Fiches technique(PDF) 23 Page - ON Semiconductor |
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MT9V023 Fiches technique(HTML) 23 Page - ON Semiconductor |
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23 / 43 page  MT9V023 www.onsemi.com 23 The formula for gain setting is: Gain + Bits[6 : 0] 0.0625 (eq. 17) The analog gain range supported in the MT9V023 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 0.0625 v/v. A value of 16 = 1X gain. Range: 1X to 1.9375X. For values 32–64: each 2 LSB increases analog gain 0.125 v/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 MT9V023, the gain logic divides the image into 25 tiles, as shown in Figure 25. 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 25, respectively. Digital gains of registers 0x80–0x98 apply to their corresponding tiles. The MT9V023 supports a digital gain of 0.25–3.75X. When binning is enabled, the tile offsets maintain their absolute values; that is, tile coordinates do not scale with row or column bin setting. 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] 0.25 (eq. 18) Figure 25. Tiled Sample Y0/5 Y1/5 Y2/5 Y3/5 Y4/5 Y5/5 x0_y0 x1_y0 x4_y0 x0_y1 x1_y1 x4_y1 x0_y2 x1_y2 x4_y2 x0_y3 x1_y3 x4_y3 x0_y4 x1_y4 x4_y4 X0/5 X1/5 X2/5 X3/5 X4/5 X5/5 Black Level Calibration Black level calibration is controlled by: • Frame Dark Average: R0x42 • Dark Average Thresholds: R0x46 • Black Level Calibration Control: R0x47 • Black Level Calibration Value: R0x48 • Black Level Calibration Value Step Size: R0x4C The MT9V023 has automatic black level calibration on-chip, and if enabled, its result may be used in the offset correction shown in Figure 26. |
Numéro de pièce similaire - MT9V023_17 |
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Description similaire - MT9V023_17 |
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