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MT9M034 データシート(PDF) 20 Page - ON Semiconductor |
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MT9M034 データシート(HTML) 20 Page - ON Semiconductor |
20 / 39 page MT9M034 www.onsemi.com 20 Synchronizing Register Writes to Frame Boundaries Changes to most register fields that affect the size or brightness of an image take effect on two frames after the one during which they are written. These fields are noted as “synchronized to frame boundaries” in the MT9M034 Register Reference. To ensure that a register update takes effect on the next frame, the write operation must be completed after the leading edge of FV and before the trailing edge of FV. Fields not identified as being frame−synchronized are updated immediately after the register write is completed. The effect of these registers on the next frame can be difficult to predict if they affect the shutter pointer. Restart To restart the MT9M034 at any time during the operation of the sensor, write a “1” to the Restart register (R0x301A[1] = 1). This has two effects: first, the current frame is interrupted immediately. Second, any writes to frame−synchronized registers and the shutter width registers take effect immediately, and a new frame starts (in video mode). The current row completes before the new frame is started, so the time between issuing the Restart and the beginning of the next frame can vary by about tROW. Image Acquisition Modes The MT9M034 supports two image acquisition modes: video(master) and single frame. Video The video mode takes pictures by scanning the rows of the sensor twice. On the first scan, each row is released from reset, starting the exposure. On the second scan, the row is sampled, processed, and returned to the reset state. The exposure for any row is therefore the time between the first and second scans. Each row is exposed for the same duration, but at slightly different point in time, which can cause a shear in moving subjects as is typical with electronic rolling shutter sensors. Single Frame The single−frame mode operates similar to the video mode. It also scans the rows of the sensor twice, first to reset the rows and second to read the rows. Unlike video mode where a continuous stream of images are output from the image sensor, the single−frame mode outputs a single frame in response to a high state placed on the TRIGGER input pin. As long as the TRIGGER pin is held in a high state, new images will be read out. After the TRIGGER pin is returned to a low state, the image sensor will not output any new images and will wait for the next high state on the TRIGGER pin. The TRIGGER pin state is detected during the vertical blanking period (i.e. the FV signal is low). The pin is level sensitive rather than edge sensitive. As such, image integration will only begin when the sensor detects that the TRIGGER pin has been held high for 3 consecutive clock cycles. If the trigger signal is applied to multiple sensors at the same time, the single frame output of the sensors will be synchronized to within 1 PIXCLK if is PLL disabled or 2 PIXCLKs if PLL is enabled. During integration time of single−frame mode and video mode, the FLASH output pin is at high. Continuous Trigger In certain applications, multiple sensors need to have their video streams synchronized (E.g. surround view or panorama view applications). The TRIGGER pin can also be used to synchronize output of multiple image sensors together and still get a video stream. This is called continuous trigger mode. Continuous trigger is enabled by holding the TRIGGER pin high. Alternatively, the TRIGGER pin can be held high until the stream bit is enabled (R0x301A[2] = 1) then can be released for continuous synchronized video streaming. If the TRIGGER pins for all connected MT9M034 sensors are connected to the same control signal, all sensors will receive the trigger pulse at the same time. If they are configured to have the same frame timing, then the usage of the TRIGGER pin guarantees that all sensors will be synchronized within 1 PIXCLK cycle if PLL is disabled, or 2 PIXCLK cycles if PLL is enabled. With continuous trigger mode, the application can now make use of the video streaming mode while guaranteeing that all sensor outputs are synchronized. As long as the initial trigger for the sensors takes place at the same time, all subsequent video streams will be synchronous. Temperature Sensor The MT9M034 sensor has a built−in PTAT−based temperature sensor, accessible through registers, that is capable of measuring die junction temperature. The temperature sensor can be enabled by writing R0x30B4[0] = 1 and R0x30B4[4] = 1. After this, the temperature sensor output value can be read from R0x30B2[10:0]. The value read out from the temperature sensor register is an ADC output value that needs to be converted downstream to a final temperature value in degrees Celsius. Since the PTAT device characteristic response is quite linear in the temperature range of operation required, a simple linear function in the format of listed in the equation below can be used to convert the ADC output value to the final temperature in degrees Celsius. Temperature + slope R0x30B2[10 : 0] ) T0 (eq. 5) For this conversion, a minimum of 2 known points are needed to construct the line formula by identifying the slope and y−intercept “T0”. These calibration values can be read from registers R0x30C6 and R0x30C8 which correspond to value read at 70°C and 55°C respectively. Once read, the slope and y−intercept values can be calculated and used in the above equation. |
同様の部品番号 - MT9M034_17 |
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同様の説明 - MT9M034_17 |
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