Smart Module Series
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4.1.1. Micro USB Interface
Only USB0_DP and USB0_DM are the system firmware burning interface. If you do not use this interface,
please be sure to reserve this interface and test points during the debugging and production process,
otherwise you will not be able to debug and produce burning firmware.
USB0_ID is internally pulled up to 1.8 V with an about 200 kΩ resistor.
USB0_VBUS is used to detect OTG mode and Device mode. It is active at high level. Its voltage range is
2.7– 3.3 V, and the typical value is 3.0 V. It is recommended to place a 100 nF capacitor near