Hardware Design V1.0
Table Of Contents
- About the Document
- Contents
- Table Index
- Figure Index
- 1 Introduction
- 2 Product Concept
- 3 Application Functions
- 4 Antenna Interface
- 5 Electrical, Reliability and Radio Characteristics
- 6 Mechanical Dimensions
- 7 Storage and Manufacturing
- 8 Appendix A Reference
NB-IoT Module Series
BC95 Hardware Design
BC95_Hardware_Design Confidential / Released 24 / 45
Peripheral
TXD
RXD
1K
TXD
RXD
RI
EINT
Module
Voltage level: 3.3V
10K
1K
1K
GND GND
Figure 11: Level Match Design for 3.3V System
It is highly recommended to add the resistor divider circuit on the UART port signal lines when the host’s
voltage level is 3.3V. For systems with a higher voltage level, a level shifter IC could be used between the
host and the module.
The following circuit shows a reference design for the communication between module and PC. As the
electrical level of module is 3.0V, so a RS-232 level shifter must be used. Please make sure the I/O
voltage of level shifter which connects to module is 3.0V.
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
10K
RS-232 Level Shifter
6
Figure 12: Sketch Map for RS-232 Interface Match
NOTE
Quectel
Confidential