Smart Module Series
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design 63 / 111
3.21. Emergency Download Interface
USB_BOOT is an emergency download interface. You can force the module to enter emergency
download mode by pulling it down to ground during power-up. This is an emergency option when
start-up failures or operational abnormalities occur. For firmware upgrade and debugging in the future,
please reserve the following reference design.
S1
Module
USB_BOOT
R1
1K
GND
Figure 29: Reference Circuit Design for Emergency Download Interface
The reference design above must be applied for firmware upgrade via USB interface.
NOTE