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MT9V023 Arkusz danych(PDF) 21 Page - ON Semiconductor |
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MT9V023 Arkusz danych(HTML) 21 Page - ON Semiconductor |
21 / 43 page MT9V023 www.onsemi.com 21 Figure 21. Sequence of Control Voltages at the HDR Gate t2 t3 V4~0.8V Exposure t1 HDR Voltage VAA (3.3V) V1~1.4V V2~1.2V V3~1.0V Figure 22. Sequence of Voltages in a Piecewise Linear Pixel Response dV1 dV2 dV3 1/t 1 1/t 2 1/t 3 Light Intensity The parameters of the step voltage V_Step which takes values V1, V2, and V3 directly affect the position of the knee points in Figure 22. Light intensities work approximately as a reciprocal of the partial exposure time. Typically, 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 MT9V023 calculates the knee points automatically using the following equations: 1 + INT * 2 * 3 (eq. 5) t tt t 2 + INT x (1 2)R0x0A[3:0] or R0xD1[3:0] (eq. 6) t t 2 + INT x (1 2)R0x0A[7:4] or R0xD1[7:4] (eq. 7) t t 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: 1 + Coarse SW1 (row * times) ) Fine SW1 (pixel * times) (eq. 8) t 2 + Coarse SW2 * Coarse SW1 ) Fine SW2 * Fine SW1 (eq. 9) t + Coarse Total Shutter Width ) Fine Shutter Width Total * 1 * 2 (eq. 10) t3 + Total Integration * 1 * 2 tt tt For context A these become: 1 + R0x08 ) R0xD3 (eq. 11) t 2 + R0x09 * ROx08 ) R0xD4 * R0xD3 (eq. 12) t 3 + R0x0B ) R0xD4 * 1 * 2 (eq. 13) tt t For context B these are: 1 + R0xCF ) R0xD6 (eq. 14) t 2 + R0xD0 * ROxCF ) R0xD7 * R0xD6 (eq. 15) t 3 + R0xD2 ) R0xD8 * 1 * 2 (eq. 16) tt t |
Podobny numer części - MT9V023_17 |
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Podobny opis - MT9V023_17 |
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