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VG6640 数据表(PDF) 109 Page - STMicroelectronics |
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VG6640 数据表(HTML) 109 Page - STMicroelectronics |
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109 / 126 page  DocID023597 Rev 11 109/126 VG6640, VD6640 Application 125 Figure 37. Power-down sequence with external 1.2V regulator in MIPI CSI-2 mode 11.3.3 Power off conditions To avoid unnecessary leakage currents, all signals connected to the image sensor must be either at a low state or high impedance when power is removed from the device. The exceptions to this rule are the EXTCLK_XTAL1, RESET_N, XSHUTDOWN and the I2C signals which are high impedance when the image sensor is powered-down. 11.4 External clock input The image sensor may be clocked either using an external clock source, or by its own oscillator driven by an external crystal. The EXTCLK_EN signal selects either the external clock source (EXTCLK_EN is HI) or the external crystal (EXTCLK_EN is LO). |
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