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SC262R series module supports (U)SIM card hot-plug via the USIM_DET pin. (This function is disabled
by default via software. To enable it, contact Quectel Technical Supports to change the software
configuration.)
A reference circuit for (U)SIM interface with an 8-pin (U)SIM card connector is shown below.
Module
Figure 16: Reference Circuit for (U)SIM Interface with an 8-pin (U)SIM Card Connector
If you do not need to use USIM_DET, keep this pin open. The following is a reference circuit for (U)SIM
interface with a 6-pin (U)SIM card connector.
Module
Figure 17: Reference Circuit for (U)SIM Interface with a 6-pin (U)SIM Card Connector
In order to ensure good performance and avoid damage of (U)SIM cards, follow the criteria listed below
during (U)SIM circuit design:
⚫
Place the (U)SIM card connector as close to the module as possible. Keep the trace length as short
as possible, at most 200 mm.
⚫
Keep (U)SIM card signals away from RF and VBAT traces.
⚫
Reserve a filter capacitor for USIM_VDD, and its maximum capacitance should not exceed 1 μF.
Additionally, place the capacitor near the
⚫
To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away from each other and
shield them with ground. USIM_RST also needs ground protection.
SC262R_Series_Hardware_Design
USIM_ VDD
LDO5 _1V8
USIM_ VDD
R6
R1
100K
NM
USIM_ VDD
USIM_ RST
R3
22R
USIM_ CLK
22R
R4
USIM_ DET
USIM_ DATA
R5
22R
C2
22 pF
USIM_ VDD
USIM_VDD
R5
R1
10K
NM
USIM_VDD
22R
USIM_RST
R2
USIM_CLK
R3
22R
22R
USIM_DATA
R4
C2
22 pF
22 pF
(U)SIM
R2
C1
10K
(U)SIM Card Connector
100 nF
VCC
RST
CLK
D1
C3
C4
22 pF
22 pF
TVS Array
C1
(U)SIM card connector
100 nF
VCC
RST
CLK
D1
C3
C4
TVS Array
22 pF
card connector.
Smart Module Series
GND
VPP
IO
GND
VPP
IO
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