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UART1_
34
TXD
UART1_
35
RXD
UART1_
36
CTS
UART1_
37
RTS
UART2_
93
RXD
UART2_
94
TXD
SD Card Interface
Pin Name
Pin No.
SD_CLK
39
SD_CMD
40
SC20-WL_Hardware_Design
DO
UART1 transmit data
DI
UART1 receive data
DI
UART1 clear to send
UART1 request to
DO
send
UART2 receive data.
DI
Debug port by
default.
UART2 transmit
data.
DO
Debug port by
default.
I/O
Description
High speed digital
DO
clock signal of SD
card
Command signal of
IO
SD card
Smart Wi-Fi Module Series
SC20-WL Hardware Design
1.8V power
V
max=0.45V
domain.
OL
V
min=1.35V
If unused, keep this
OH
pin open.
1.8V power
V
max=0.63V
domain.
IL
V
min=1.17V
If unused, keep this
IH
pin open.
1.8V power
V
max=0.63V
domain.
IL
V
min=1.17V
If unused, keep this
IH
pin open.
1.8V power
V
max=0.45V
domain.
OL
V
min=1.35V
If unused, keep this
OH
pin open.
1.8V power
V
max=0.63V
domain.
IL
V
min=1.17V
If unused, keep this
IH
pin open.
1.8V power
V
max=0.45V
domain.
OL
V
min=1.35V
If unused, keep this
OH
pin open.
DC
Comment
Characteristics
1.8V SD card:
V
max=0.45V
OL
V
min=1.4V
OH
2.95V SD card:
V
max=0.37V
OL
V
min=2.2V
OH
1.8V SD card:
V
max=0.58V
IL
V
min=1.27V
IH
V
max=0.45V
OL
V
min=1.4V
OH
2.95V SD card:
V
max=0.73V
IL
V
min=1.84V
IH
23 / 81
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