Smart Module Series
SC20_Series_Hardware_Design 46 / 133
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
Pin No.
I/O
Description
Comment
USIM2_DETECT
17
DI
(U)SIM2 card hot-plug detect
Active low.
Externally pull it up to 1.8 V.
If unused, keep this pin open.
USIM2_RST
18
DO
(U)SIM2 card reset
USIM2_CLK
19
DO
(U)SIM2 card clock
USIM2_DATA
20
DIO
(U)SIM2 card data
Externally pull it up to
USIM2_VDD with a 10 kΩ
resistor.
USIM2_VDD
21
PO
(U)SIM2 card power supply
Either 1.8 V or 2.95 V (U)SIM
card is supported by the
module automatically.
USIM1_DETECT
22
DI
(U)SIM1 card hot-plug detect
Active low.
Externally pull it up to 1.8 V.
If unused, keep this pin open.
USIM1_RST
23
DO
(U)SIM1 card reset
USIM1_CLK
24
DO
(U)SIM1 card clock
USIM1_DATA
25
DIO
(U)SIM1 card data
Externally pull it up to
USIM1_VDD with a 10 kΩ
resistor.
USIM1_VDD
26
PO
(U)SIM1 card power supply
Either 1.8 V or 2.95 V (U)SIM
card is supported by the
module automatically.
NOTE
