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FIBOCOM SU806 Series Hardware Guide
Page 56 of 86
3.20
Force Download Interface
SU806D-EAU series module provides KEY_FORCE_BOOT pin as an emergency download interface.
Connect the KEY_FORCE_BOOT with GND when power on, the module can enter the emergency
download mode which is used for the final processing mode when the product fails to power on or run
normally. To facilitate the subsequent software upgrade and product debugging, please reserve the test
pin of this pin. Reference design is shown in the following figure:
Module
FORCE_BOOT
S1
1K
Figure 3-24 Force download reference design