Smart Module Series
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design 44 / 111
The following figure is an example of connection between the module and PC. A voltage level translator
and an RS-232 level translator chip are recommended to be added between the module and PC, as
shown below:
TXS0104 EPWR
RXD_3.3 V
CTS_3.3 V
VCCA
Module
GND
GND
1.85 V
VCCB
3.3 V
DIN 1
ROUT 3
ROUT 2
ROUT 1
DIN 4
DIN 3
DIN 2
DIN 5
FORCEON
3.3 V
DOUT1
DOUT2
DOUT3
DOUT4
DOUT5
RIN3
RIN2
RIN1
VCC
GND
OE
SN65C 3238
DB-9
RTS
TXD
CTS
RXD
GND
RTS_ 3.3 V
UART0_TXD
UART0_RTS
UART0_RXD
UART0_CTS
TXD_1.85 V
RTS_1.85 V
RXD_1.85 V
CTS_1.85 V
/FORCEOFF
/INVALID
R1OUTB
TXD_3.3 V
Figure 16: RS-232 Level Match Circuit (for UART0)
3.10. (U)SIM Interfaces
The module provides two (U)SIM interfaces that 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 interfaces are 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_DET
17
DI
(U)SIM2 card hot-plug
detect
This function is enabled by default.
Active low.
If it is not used, keep it 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
USIM2_VDD
21
PO
(U)SIM2 card power
supply
Either 1.8 V or 2.95 V (U)SIM card
is supported.
USIM1_DET
22
DI
(U)SIM1 card hot-plug
detect
This function is enabled by default.
Active low.
If it is not used, keep it open.