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1.8V
OE
VCCA
UART6_TXD
TXD_1.8V
UART6_RTS
RTS_1.8V
UART6_RXD
RXD_1.8V
UART6_CTS
CTS_1.8V
GND
GND
Module
Figure 18: RS232 Level Match Circuit (for UART5)
NOTE
Debug UART, UART1, LPI_UART_2 are similar to UART6. Please refer to UART6 reference circuit
design for DEBUG UART, UART1, LPI_UART_2.
3.11. (U)SIM Interfaces
SC66 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 in SC66 module.
Table 17: Pin Definition of (U)SIM Interfaces
Pin Name
Pin No.
USIM1_DET
145
USIM1_RST
144
USIM1_CLK
143
USIM1_DATA
142
SC66_Hardware_Design
3.3V
VCCB
VCC
TXD_3.3V
DIN 1
RTS_3.3V
DIN 2
DIN 3
DIN 4
DIN 5
R1OUTB
RXD _3.3V
ROUT1
ROUT 2
CTS _3.3V
ROUT3
FORCEON
3.3V
/FORCEOFF
TXS0104 EPWR
SN65C 3238
I/O
Description
(U)SIM1 card insertion
DI
detection
DO
(U)SIM1 card reset signal
DO
(U)SIM1 card clock signal
IO
(U)SIM1 card data signal
Smart LTE Module Series
SC66 Hardware Design
GND
GND
DOUT1
RXD
DOUT2
CTS
DOUT3
DOUT4
DOUT5
TXD
RIN1
RIN2
RTS
RIN3
/INVALID
DB-9
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.
Cannot
be
multiplexed
into
general-purpose GPIOs.
Pull up to USIM1 with a 10KΩ
resistor.
60 / 139
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