Quectel SG560D Series Hardware Design page 63

The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
Module
Figure 15: Reference Circuit of (U)SIM Interface with 8-Pin (U)SIM Card Connector
If (U)SIM card detection function is not needed, please keep USIM_DET unconnected.
A reference circuit for (U)SIM card interface with a 6-pin (U)SIM card connector is illustrated in the
following figure.
Module
Figure 16: Reference Circuit of (U)SIM Interface with 6-Pin (U)SIM Card Connector
To enhance the reliability and availability of the (U)SIM card in applications, please follow the criteria
below in (U)SIM circuit design.
⚫
Place the (U)SIM card connector as close to the module as possible. Keep the trace length as less
than 200 mm as possible.
⚫
Keep (U)SIM card signals away from RF and VBAT traces.
⚫
To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away from each other and
shield them with surrounded ground. In addition, USIM_RST also needs to be shielded with
surrounded ground.
SG560D_Series_Hardware_Design
LDO18B_1V8
R5
100K
USIM_ VDD
USIM_ RST
R1
USIM_ CLK
R2
USIM_ DET
USIM_ DATA
R3
GND
USIM_ VDD
22 R
USIM_ RST
R2
USIM_ CLK
R3
USIM_ DET
22 R
22 R
USIM_ DATA
R4
GND
C2
22 pF
C1
100 n F
R4 20K
22 R
22 R
22 R
C2 C3 C4
22 pF 22 pF 22 pF
C1
20K
100 nF
R1
C3 C4
22 pF 22 pF
Smart Module Series
(U)SIM Card Connector
VCC GND
RST VPP
IO
CLK
D1
TVS
array
(U)SIM Card Connector
VCC GND
RST VPP
CLK IO
D1
TVS
array
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