Emergency Download Interface - Quectel SC20-WL Hardware Design

Smart Wi-Fi Module Series
SC20-WL Hardware Design

3.22. Emergency Download Interface

USB_BOOT is an emergency download interface. Pull up to LDO5_1V8 during power-up will force the
module enter into emergency download mode. This is an emergency option when there are failures such
as abnormal startup or running. For convenient firmware upgrade and debugging in the future, please
reverse this pin. The reference circuit design is shown as below.
5
LDO _1V8
S1
R1
USB_BOOT
10K
D1
Module
Figure 28: Reference Circuit Design for Emergency Download Interface
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