Product Info
Table Of Contents
- About the Document
- Contents
- Table Index
- Figure Index
- 1Introduction
- 2Product Concept
- 3Application Interfaces
- 4Antenna Interface
- 5Reliability and Electrical Characteristics
- 6Mechanical Features
- 7Storage, Manufacturing and Packaging
- 8Appendix A References
NB-IoT Module Series
BC660K-GL Hardware Design
BC660K-GL_Hardware_Design
3-27
/ 59
Figure 10: Reference Circuit of BOOT by Using Button
If the BOOT pin is connected to a filter capacitor in parallel, the capacitance of the capacitor cannot be
higher than 33 pF.
3.7. UART Interfaces
The module provides two UART ports: main UART port and debug UART port. The module is designed
as DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment)
connection.
Table 10: Pin Definition of UART Interfaces
Interface
Pin Name
Pin No.
Description
Main UART Port
MAIN_TXD
17
Main UART transmit
MAIN_RXD
18
Main UART receive
Debug UART Port
DBG_RXD
38
Debug UART receive
DBG_TXD
39
Debug UART transmit
Ring Indication
RI*
20
Ring indication (when there is a SMS or a URC
output, the module will inform DTE with the RI pin)
NOTE