Quectel SC20 Series Hardware Design page 28

USIM2_DATA
USIM2_VDD
USIM1_DETECT
USIM1_RST
USIM1_CLK
USIM1_DATA
USIM1_VDD
UART Interfaces
Pin Name
UART1_TX
SC20_Series_Hardware_Design
20 DIO (U)SIM2 card data
(U)SIM2 card
21 PO
power supply
(U)SIM1 card
22 DI
hot-plug detect
(U)SIM1 card
23 DO
reset
(U)SIM1 card
24 DO
clock
25 DIO (U)SIM1 card data
(U)SIM1 card
26 PO
power supply
Pin
I/O Description
No.
34 DO UART1 transmit
Smart Module Series
V max =
IL
0.2 × USIM2_VDD
V min =
IH
0.7 × USIM2_VDD
V max = 0.4 V
OL
V min =
OH
0.8 × USIM2_VDD
For 1.8 V (U)SIM:
Vmax = 1.85 V
Vmin = 1.75 V
For 2.95 V (U)SIM:
Vmax = 3.1V
Vmin = 2.8 V
V max = 0.63 V
IL
V min = 1.17 V
IH
V max = 0.4 V
OL
V min =
OH
0.8 × USIM1_VDD
V max =
IL
0.2 × USIM1_VDD
V min =
IH
0.7 × USIM1_VDD
V max = 0.4 V
OL
V min =
OH
0.8 × USIM1_VDD
For 1.8 V (U)SIM:
Vmax = 1.85 V
Vmin = 1.75 V
For 2.95 V (U)SIM:
Vmax = 3.1V
Vmin = 2.8 V
DC Characteristics Comment
V max = 0.45 V
OL
V min = 1.35 V
OH
Externally pull it up
to USIM2_VDD
with a 10 kΩ
resistor.
Either 1.8 V or 2.95
V (U)SIM card is
supported by the
module
automatically.
Active low.
Externally pull it up
to 1.8 V.
If unused, keep this
pin open.
Externally pull it up
to USIM1_VDD
with a 10 kΩ
resistor.
Either 1.8 V or 2.95
V (U)SIM card is
supported by the
module
automatically.
1.8 V power
domain.
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