Product Info

Smart LTE Module Series
SC66 Hardware Design
SC66_Hardware_Design 59 / 118
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 from SC66 module.
Table 17: Pin Definition of (U)SIM Interfaces
SC66 supports (U)SIM card hot-plug via the USIM_DET pin, which is disabled by default and can be
enabled through software configuration. A reference circuit for (U)SIM interface with an 8-pin (U)SIM card
connector is shown as below.
Pin Name
Pin No.
I/O
Description
Comment
USIM1_DET
145
DI
(U)SIM1 card detection
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.
USIM1_RST
144
DO
(U)SIM1 card reset signal
USIM1_CLK
143
DO
(U)SIM1 card clock signal
USIM1_DATA
142
IO
(U)SIM1 card data signal
Pull up to USIM1 with a 10K
resistor.
USIM1_VDD
141
PO
(U)SIM1 card power supply
Either 1.8V or 2.95V (U)SIM card
is supported.
USIM2_DET
256
DI
(U)SIM2 card insertion
detection
Active low.
Need external pull-up to1.8V
If unused, keep this pin open.
USIM2_RST
207
DO
(U)SIM2 card reset signal
USIM2_CLK
208
DO
(U)SIM2 card clock signal
USIM2_DATA
209
IO
(U)SIM2 card data signal
Pull-up to USIM2 with a 10K
resistor.
USIM2_VDD
210
PO
(U)SIM2 card power supply
Either 1.8V or 2.95V (U)SIM card
is supported.