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Smart Module Series
SA800U-WF Hardware Design
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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.
VREG_S4A_1V8
S1
Module
USB_BOOT
R1
10K
Figure 29: Reference Circuit Design for Emergency Download Interface
I2S2_DATA1
J2-61
DIO
I2S2 data channel 1
I2S3_WS
J2-63
DO
I2S3 word select
I2S3_DATA1
J2-65
DIO
I2S3 data channel 1
I2S3_DATA2
J2-67
DIO
I2S3 data channel 2
I2S3_DATA0
J2-69
DIO
I2S3 data channel 0
I2S3_DATA3
J2-71
DIO
I2S3 data channel 3
I2S3_SCK
J2-73
DO
I2S3 bit clock