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I2S2_DATA1
I2S3_WS
I2S3_DATA1
I2S3_DATA2
I2S3_DATA0
I2S3_DATA3
I2S3_SCK
3.23. Emergency Download Interface
USB_BOOT is an emergency download interface. Pulling it up to VREG_S4A_1V8 during power-up will
force the module into emergency download mode. This is an emergency option when there are failures
such as abnormal startup or operation. For convenient firmware upgrade and debugging in the future,
please reserve the reference circuit design shown as below.
Figure 29: Reference Circuit Design for Emergency Download Interface
SA800U-WF_Hardware_Design
J2-61
DIO
I2S2 data channel 1
J2-63
DO
I2S3 word select
J2-65
DIO
I2S3 data channel 1
J2-67
DIO
I2S3 data channel 2
J2-69
DIO
I2S3 data channel 0
J2-71
DIO
I2S3 data channel 3
J2-73
DO
I2S3 bit clock
USB_BOOT
Module
SA800U-WF Hardware Design
VREG_S4A_1V8
S1
R1
10K
Smart Module Series
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