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1.8V
UART5_TXD
UART5_RTS
UART5_RXD
UART5_CTS
GND
Module
NOTE
UART2, UART4 and UART6 are similar to UART5. Please refer to UART5 reference circuit design for
UART2, UART4 and UART6's.
3.11. (U)SIM Interfaces
SC650T provides two (U)SIM interfaces which both meet ETSI and IMT-2000 requirements. Dual SIM
Dual Standby is supported by default. Both 1.8V and 2.95V (U)SIM cards are supported, and the (U)SIM
interfaces are powered by the dedicated low dropout regulators from SC650T module.
Table 11: Pin Definition of (U)SIM Interfaces
Pin Name
Pin No.
USIM1_DET
145
USIM1_RST
144
USIM1_CLK
143
SC650T_Hardware_Design
OE
VCCA
VCCB
TXD_3.3V
TXD_1.8V
RTS_3.3V
RTS_1.8V
RXD_1.8V
RXD _3.3V
CTS _3.3V
CTS_1.8V
GND
TXS0104 EPWR
Figure 14: RS232 Level Match Circuit (for UART5)
I/O
Description
DI
(U)SIM1 card detection
DO
(U)SIM1 card reset signal
DO
(U)SIM1 card clock signal
3.3V
VCC
DIN 1
DIN 2
DIN 3
DIN 4
DIN 5
R1OUTB
ROUT1
ROUT 2
ROUT3
FORCEON
3.3V
/FORCEOFF
SN65C 3238
Comment
Active Low.
Need external pull-up to 1.8V.
If unused, keep this pin open.
Disabled by default, and can be
enabled through software
configuration.
Smart LTE Module Series
SC650T Hardware Design
GND
GND
DOUT1
RXD
DOUT2
CTS
DOUT3
DOUT4
DOUT5
TXD
RIN1
RIN2
RTS
RIN3
/INVALID
DB-9
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