Quectel SC20 Series Hardware Design page 29

UART1_RX
UART1_CTS
UART1_RTS
UART2_RX
UART2_TX
SD Card Interface
Pin Name
SD_LDO11
SD_LDO12
SD_CLK
SD_CMD
SD_DATA0
SD_DATA1
SC20_Series_Hardware_Design
35 DI UART1 receive
DTE clear to send
36 DI
signal from DCE
DTE request to
37 DO send signal to
DCE
UART2 receive;
93 DI Debug port by
default
UART2 transmit;
94 DO Debug port by
default
Pin
I/O Description
No.
SD card power
38 PO
supply
1.8/2.95 V output
32 PO power for SD card
pull-up circuits
39 DO SD card clock
SD card
40 DIO
command
41 DIO SDIO data bit 0
42 DIO SDIO data bit 1
Smart Module Series
V max = 0.63 V
IL
V min = 1.17 V
IH
V max = 0.63 V
IL
V min = 1.17 V
IH
V max = 0.45 V
OL
V min = 1.35 V
OH
V max = 0.63 V
IL
V min = 1.17 V
IH
V max = 0.45 V
OL
V min = 1.35 V
OH
DC Characteristics Comment
Vnom = 2.95 V
I max = 600 mA
O
Vnom = 1.8/2.95 V
I max = 50 mA
O
1.8 V SD card:
V max = 0.45 V
OL
V min = 1.4 V
OH
2.95 V SD card:
V max = 0.37 V
OL
V min = 2.2 V
OH
1.8 V SD card:
V max = 0.58 V
IL
V min = 1.27 V
IH
V max = 0.45 V
OL
V min = 1.4 V
OH
If unused, keep
these pins open.
Connect to DTE'S
CTS;
1.8 V power
domain.
If unused, keep
these pins open.
Connect to DTE'S
RTS;
1.8 V power
domain.
If unused, keep
these pins open.
1.8 V power
domain.
If unused, keep
these pins open.
Control
characteristic
impedance as 50
Ω.
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