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The external USIM card is powered by an internal regulator in the module and supports 1.8V/3.0V power
supply.
Table 13: Pin Definition of USIM Interface
Pin Name
Pin No.
SIM_VDD
38
SIM_CLK
41
SIM_DATA
40
SIM_RST
39
SIM_GND
42
A reference circuit design for USIM interface with a 6-pin USIM card connector is illustrated below.
Module
Figure 22: Reference Circuit for USIM Interface with a 6-pin USIM Card Connector
For
more
information
http://www.molex.com.
In order to enhance the reliability and availability of USIM card in application, please follow the criteria
below in USIM circuit design:
Keep the placement of USIM card connector as close as possible to the module. Keep the trace
length as less than 200mm as possible.
Keep USIM card signals away from RF and VBAT traces.
Assure the trace between the ground of module and that of USIM card connector is short and wide.
Keep the trace width of ground no less than 0.5mm to maintain the same electric potential. The
BC950N-N1_Hardware_Design
Description
Power supply for USIM card
Clock signal of USIM card
Data signal of USIM card
Reset signal of USIM card
Specified ground for USIM card
SIM_GND
SIM_VDD
SIM_RST
22R
SIM_CLK
22R
10K
22R
SIM_DATA
33pF33pF 33pF
of
USIM
card
connector,
Comment
Voltage accuracy: 1.8V/3.0V±5%.
Maximum supply current: about 60mA.
100nF
33pF
TVS
GND
GND
please
visit
LPWA Module Series
BC950N-N1 Hardware Design
USIM Card Connector
VCC
GND
RST
VPP
CLK
IO
http://www.amphenol.com
or
34 / 59
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