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ASX340CS датащи(PDF) 57 Page - ON Semiconductor |
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ASX340CS датащи(HTML) 57 Page - ON Semiconductor |
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57 / 74 page ![]() ASX340CS_DS Rev. F Pub. 6/15 EN 57 ©Semiconductor Components Industries, LLC, 2015. ASX340CS: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor Modes and Timing Figure 39: Power Up Sequence Notes: 1. RESET_BAR may not exceed VDD_IO + 0.3V. 2. The 2.8V plane (VAA, VAA_PIX, VDD_PLL, VDD_DAC, VDD_IO) must remain at a higher voltage than the 1.8V core voltage at all times. Notes: 1. Xtal settling time is component-dependent (Xtal, Oscillator, and so on) and usually takes about 10ms ~100ms. 2. Hard reset time is the minimum time required after power rails are settled. Ten clock cycles are required for the sensor itself, assuming all power rails are settled. In a circuit where Hard reset is performed by the RC circuit, then the RC time must include the all power rail settle time and Xtal. Table 29: Power Up Sequence Definition Symbol Minimum Typical Maximum Unit VDD_PLL to VAA/VAA_PIX t0 0 – – s VAA/VAA_PIX to VDD_IO t1 0 – – s VDD_IO to VDD t2 0 – – s Xtal settle time tx – 301 –ms Hard Reset t3 102 –– Clock cycle Internal Initialization t4 50 – – ms VDD (1.8) VAA_PIX VAA (2.8) VDD_PLL VDD_DAC (2.8) EXTCLK RESET_BAR VDD_IO (2.8) t3 t4 t5 t0 t1 Hard Reset Internal (NTSC/PAL) Initialization Patch Config SPI or Host Streaming t2 tx |
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