Quectel RG255C-GL - Page 24

5G Module Series
RG255C-GL_Mini_PCIe_Hardware_Design 23 / 57
USIM_VDD
GND
USIM_RST
USIM_CLK
USIM_DATA
USIM_DET
100 nF
GND
GND
33 pF 33 pF 33 pF
VCC
RST
CLK
IO
VPP
GND
GND
USIM_VDD
20K
(U)SIM Card Connector
Module
0R
0R
0R
USIM_VDD
20K
Figure 5: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector
If (U)SIM card hot-plug detect is not needed, keep USIM_DET unconnected. A reference circuit for
(U)SIM interface with a 6-pin (U)SIM card connector is illustrated in the following figure.
USIM_VDD
GND
USIM_RST
USIM_CLK
USIM_DATA
0R
0R
0R
100 nF
GND
33 pF 33 pF 33 pF
VCC
RST
CLK IO
VPP
GND
GND
20K
USIM_VDD
(U)SIM Card Connector
Module
20K
USIM_VDD
Figure 6: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector
To enhance the reliability and availability of the (U)SIM card in your applications, please follow the criteria
below in the (U)SIM circuit design: