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MT9M034 データシート(PDF) 18 Page - ON Semiconductor |
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MT9M034 データシート(HTML) 18 Page - ON Semiconductor |
18 / 39 page MT9M034 www.onsemi.com 18 Spread−Spectrum Clocking To facilitate improved EMI performance, the external clock input allows for spread spectrum sources, with no impact on image quality. Limits of the spread spectrum input clock are: • 5% maximum clock modulation • 35 KHz maximum modulation frequency • Accepts triangle wave modulation, as well as sine or modified triangle modulations. Stream/Standby Control The sensor supports two standby modes: Hard Standby and Soft Standby. In both modes, external clock can be optionally disabled to further minimize power consumption. If this is done, then the “Power−Up Sequence” must be followed. Soft Standby Soft Standby is a low power state that is controlled through register R0x301A[2]. Depending on the value of R0x301A[4], the sensor will go to standby after completion of the current frame readout (default behavior) or after the completion of the current row readout. When the sensor comes back from Soft Standby, previously written register settings are still maintained. Soft standby will not occur if the TRIGGER pin is held high. A specific sequence needs to be followed to enter and exit from Soft Standby. Entering Soft Standby: 1. Set R0x301A[2] = 0 and drive the TRIGGER pin LOW 2. External clock can be turned off to further minimize power consumption (Optional) Exiting Soft Standby: 1. Enable external clock if it was turned off 2. R0x301A[2] = 1 or drive the TRIGGER pin HIGH Hard Standby Hard Standby puts the sensor in lower power state; previously written register settings are still maintained. A specific sequence needs to be followed to enter and exit from Hard Standby. Entering Hard Standby: 1. R0x301A[8] = 1 2. Assert STANDBY pin 3. External clock can be turned off to further minimize power consumption (Optional) Exiting Hard Standby: 1. Enable external clock if it was turned off 2. De−assert STANDBY pin 3. Set R0x301A[8] = 0 Window Control Registers x_addr_start, x_addr_end, y_addr_start, and y_addr_end control the size and starting coordinates of the image window. The exact window height and width out of the sensor is determined by the difference between the Y address start and end registers or the X address start and end registers, respectively. The MT9M034 allows different window sizes for context A and context B. Blanking Control Horizontal blank and vertical blank times are controlled by the line_length_pck and frame_length_lines registers, respectively. • Horizontal blanking is specified in terms of pixel clocks. It is calculated by subtracting the X window size from the line_length_pck register. The minimum horizontal blanking is 370 pixel clocks. • Vertical blanking is specified in terms of numbers of lines. It is calculated by subtracting the Y window size from the frame_length_lines register. The minimum vertical blanking is 26 lines. The actual imager timing can be calculated using Table 5 and Table 6, which describe the Line Timing and FV/LV signals. When in HDR mode, the maximum size is 1280 × 960. Readout Modes Digital Binning By default, the resolution of the output image is the full width and height of the FOV as defined above. The output resolution can be reduced by digital binning. For RGB and monochrome mode, this is set by the register R0x3032. For Context A, use bits [1:0], for Context B, use bits [5:4]. Available settings are: 00 = No binning 01 = Horizontal binning 10 = Horizontal and vertical binning Binning gives the advantage of reducing noise at the cost of reduced resolution. When both horizontal and vertical binning are used, a 2x improvement in SNR is achieved, therefore improving low light performance. Binning results in a smaller resolution image, but the FOVs between the binned and unbinned images are the same. Bayer Space Resampling All of the pixels in the FOV contribute to the output image in digital binning mode. This can result in a more pleasing output image with reduced subsampling artifacts. It also improves low−light performance. For RGB mode, resampling can be enabled by setting of register 0x306E[4] = 1. |
同様の部品番号 - MT9M034_17 |
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同様の説明 - MT9M034_17 |
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