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USIM1_VDD
141
USIM2_DET
256
USIM2_RST
207
USIM2_CLK
208
USIM2_DATA
209
USIM2_VDD
210
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 below.
LDO13A_1P8
USIM_ VDD
USIM_ RST
Module
USIM_ CLK
USIM_ DET
USIM_ DATA
Figure 19: Reference Circuit for (U)SIM Interface with an 8-pin (U)SIM Card Connector
If there is no need to use USIM_DET, please keep it open. The following is a reference circuit for (U)SIM
interface with a 6-pin (U)SIM card connector.
SC66_Hardware_Design
PO
(U)SIM1 card power supply
(U)SIM2 card insertion
DI
detection
DO
(U)SIM2 card reset signal
DO
(U)SIM2 card clock signal
IO
(U)SIM2 card data signal
PO
(U)SIM2 card power supply
USIM_ VDD
R2
R1
100K
10K
R3
22R
22R
R4
R5
22R
C2
C3
C4
22pF
22pF
22pF
Smart LTE Module Series
SC66 Hardware Design
Cannot be multiplexed into a
general-purpose GPIO.
Either 1.8V or 2.95V (U)SIM card
is supported.
Active low.
Need external pull-up to1.8V.
If unused, keep this pin open.
Cannot be multiplexed into a
general-purpose GPIO.
Cannot be multiplexed into a
general-purpose GPIO.
Pull up to USIM2 with a 10KΩ
resistor.
Cannot be multiplexed into a
general-purpose GPIO.
Either 1.8V or 2.95V (U)SIM card
is supported.
C1
(U)SIM Card Connector
100nF
VCC
GND
RST
VPP
IO
CLK
D1
ESD
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