NB-IoT Module Series
BC95 Hardware Design
BC95_Hardware_Design Confidential / Released 26 / 51
TXD
RXD
RI
Module
GND
C1+
C1-
C2+
C2-
V+
VCC
GND
V-
3.3V
T1IN
T2IN
T3IN
T4IN
R1IN
R2IN
R3IN
R1OUT
R2OUT
R3OUT
T1OUT
T2OUT
T5OUT
T3OUT
T4OUT
T5IN
GND
GND
/R1OUT
1
2
3
4
5
7
8
9
GND
To PC Main Serial Port
GND
1K
1K
1K
RS-232 Level Shifter
6
Figure 12: Sketch Map for RS-232 Interface Match
Please visit vendor web site to select the suitable RS-232 level shifter IC, such as: http://www.exar.com
and http://www.maximintegrated.com.
3.9. USIM Card Interface
The module contains one USIM interface to allow the module to access the USIM card.
3.9.1. USIM Card Application
The USIM card interface supports the functionality of the 3GPP specification, which is intended for use
with a USIM application tool-kit.
The USIM card interface is powered by an internal regulator in the module. Only 3.0V USIM card is
supported.
Table 10: Pin Definition of the USIM Card Interface
Pin No.
Pin Name
Description
38
USIM_VDD
Supply power for USIM card.
USIM card voltage domain is 3.0V±5%.
Quectel
Confidential
