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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:
UART0_TXD
UART0_RTS
UART0_RXD
UART0_CTS
GND
Module
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
USIM2_DET
USIM2_RST
USIM2_CLK
USIM2_DATA
USIM2_VDD
USIM1_DET
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design
1.85 V
OE
VCCA
TXD_3.3 V
TXD_1.85 V
RTS _ 3 . 3 V
RTS_1.85 V
RXD_1.85 V
RXD _3.3 V
CTS _3.3 V
CTS_1.85 V
GND
TXS0104 EPWR
Figure 16: RS-232 Level Match Circuit (for UART0)
Pin No.
I/O
Description
(U)SIM2 card hot-plug
17
DI
detect
18
DO
(U)SIM2 card reset
19
DO
(U)SIM2 card clock
20
DIO
(U)SIM2 card data
(U)SIM2 card power
21
PO
supply
(U)SIM1 card hot-plug
22
DI
detect
3.3 V
VCCB
VCC
DIN 1
DIN 2
DIN 3
DIN 4
DIN 5
R1OUTB
ROUT1
ROUT 2
ROUT3
FORCEON
3.3 V
/FORCEOFF
SN65C 3238
Smart Module Series
GND
GND
DOUT1
RXD
DOUT2
CTS
DOUT3
DOUT4
DOUT5
TXD
RIN1
RIN2
RTS
RIN3
/INVALID
DB-9
Comment
This function is enabled by default.
Active low.
If it is not used, keep it open.
Either 1.8 V or 2.95 V (U)SIM card
is supported.
This function is enabled by default.
Active low.
If it is not used, keep it open.
44 / 111
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