Emergency Download Interface - Quectel SC20 Series Hardware Design

Smart Module Series

3.23. Emergency Download Interface

USB_BOOT is an emergency download interface. You can force the module to enter emergency
download mode by pulling it up to LDO5_1V8 during power-up. This is an emergency option when failures
such as abnormal start-up or running occur. For firmware upgrade and debugging in the future, reserve
the following reference design.
Figure 30: Reference Circuit Design for Emergency Download Interface
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