Product Info

LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design
43 / 102
VDD_EXT USIM_VDD
USIM_GND
USIM_VDD
51K
15K
100nF (U)SIM Card Connector
Module
USIM_RST
0R
USIM_CLK
VCC
RST
GND
VPP
USIM_PRESENCE
0R
USIM_DATA
0R
CLK
IO
33pF 33pF 33pF
GND
GND GND
Figure 17: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector
If (U)SIM card detection function is not needed, please keep USIM_PRESENCE unconnected. A
reference circuit of (U)SIM interface with a 6-pin (U)SIM card connector is illustrated in the following
figure.
USIM_VDD
USIM_GND
USIM_VDD
15K
100nF
(U)SIM Card Connector
Module
USIM_RST
0R
USIM_CLK
VCC
RST
GND
VPP
0R
USIM_DATA
0R
CLK IO
33pF 33pF 33pF
GND GND
Figure 18: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector
In order to enhance the reliability and availability of the (U)SIM cards in customers’ applications, please
follow the criteria below in the (U)SIM circuit design:
• Keep placement of (U)SIM card connector to the module as close as possible. Keep the trace length
as less than 200mm as possible.
• Keep (U)SIM card signals away from RF and VBAT traces.