U)Sim Interfaces - Quectel SC20 Series Hardware Design

NOTE
UART2 is similar to UART1. For the reference design, see that of UART1.

3.11. (U)SIM Interfaces

SC20 series provides two (U)SIM interfaces which meet ETSI and IMT-2000 requirements. Dual SIM
Card Dual Standby is supported by default. Either 1.8 V or 2.95 V (U)SIM card is supported, and the
(U)SIM card is powered by the internal power supply of the module.
Table 14: Pin Definition of (U)SIM Interfaces
Pin Name
USIM2_DETECT
USIM2_RST
USIM2_CLK
USIM2_DATA
USIM2_VDD
USIM1_DETECT
USIM1_RST
USIM1_CLK
USIM1_DATA
USIM1_VDD
SC20_Series_Hardware_Design
Pin No. I/O Description
17 DI (U)SIM2 card hot-plug detect
18 DO (U)SIM2 card reset
19 DO (U)SIM2 card clock
20 DIO (U)SIM2 card data
21 PO (U)SIM2 card power supply
22 DI (U)SIM1 card hot-plug detect
23 DO (U)SIM1 card reset
24 DO (U)SIM1 card clock
25 DIO (U)SIM1 card data
26 PO (U)SIM1 card power supply
Smart Module Series
Comment
Active low.
Externally pull it up to 1.8 V.
If unused, keep this pin open.
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.
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