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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8224 датащи(PDF) 30 Page - Wolfson Microelectronics plc |
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WM8224 датащи(HTML) 30 Page - Wolfson Microelectronics plc |
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30 / 50 page  WM8224 Production Data w PD, Rev 4.1, June 2012 30 1. Dummy Pixel delay Set BLC_DEL, the number of dummy pixels for the sensor BLC_DEL = ‘0010100’ The duration for this will then be BLC_DEL * VSMP period Dummy pixel delay = 20*75ns = 1.5us 2. Define the coarse adjust loop When setting the coarse adjust calibration it is necessary to bear in mind the following: The number of black pixels available The coarse adjust iteration duration The number of iterations required. Step 1: Set up BPIX_AVAIL with the number of available black pixels for the sensor. BPIX_AVAIL = ’0000110010’ Step 2: Calculate MCLK:VSMP ratio 40:13.33 = 3:1 Step 3: Calculate the duration of the iteration in no. of pixels (round up value). Refer to Table 4 for the number of MCLK’s per Coarse Adjust iteration Round up this value to give the no of pixels per iteration = 4 pixels per iteration Note: The device will automatically calculate this value. Step 4: Set the register CADUR for max number of iterations. CADUR = 2 Theoretically there can be 7 coarse adjust iterations during the black pixel period. However, in most cases 2 would be sufficient depending on the number of black pixels available to allow time for the fine adjust loop. 3. Fine Adjust Calibration Step 1: Enable Register FA_EN to allow for fine adjust calibration Step 2: The time available for fine adjustment is determined by the no. of remaining black pixels after the coarse adjust has taken place. BPIX_AVAIL – (CADUR* iteration duration) 50 – (2*4) = 42 pixels pixels of no ratio VSMP MCLK MCLKs of no . ) : ( . 67 . 3 3 11 ) : ( . ratio VSMP MCLK MCLKs of no |
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