Product Info

LPWA Module Series
BG95 Series Hardware Design
BG95_Series_Hardware_Design 46 / 106
BG95 supports (U)SIM card hot-plug via the USIM_DET pin, and both high and low level detections are
supported. The function is disabled by default, and see AT+QSIMDET command in document [2] for
more details.
The following figure shows a reference design of (U)SIM interface with an 8-pin (U)SIM card connector.
Module
USIM_VDD
USIM_GND
USIM_RST
USIM_CLK
USIM_DATA
USIM_DET
0R
0R
0R
VDD_EXT
51K
100 nF (U)SIM Card Connector
GND
GND
33 pF
33 pF 33 pF
VCC
RST
CLK
IO
VPP
GND
GND
USIM_VDD
15K
Figure 14: 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_DET unconnected. A reference circuit
for (U)SIM interface with a 6-pin (U)SIM card connector is illustrated in the following figure.
Module
USIM_VDD
USIM_GND
USIM_RST
USIM_CLK
USIM_DATA
0R
0R
0R
100 nF
(U)SIM Card Connector
GND
33 pF 33 pF 33 pF
VCC
RST
CLK IO
VPP
GND
GND
15K
USIM_VDD
Figure 15: 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 card in applications, please follow the
criteria below in (U)SIM circuit design: