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Quectel BC65 Hardware Design

Nb-iot module
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BC65
Hardware Design
NB-IoT Module Series
Version: 1.0
Date: 2021-02-08
Status: Released
www.quectel.com

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Summary of Contents for Quectel BC65

  • Page 1 BC65 Hardware Design NB-IoT Module Series Version: 1.0 Date: 2021-02-08 Status: Released www.quectel.com...
  • Page 2 To the maximum extent permitted by law, Quectel excludes all liability for any loss or damage suffered in connection with the use of the functions and features under development, regardless of whether such loss or damage may have been foreseeable.
  • Page 3 BC65 Hardware Design Copyright The information contained here is proprietary technical information of Quectel. Transmitting, reproducing, disseminating and editing this document as well as using the content without permission are forbidden. Offenders will be held liable for payment of damages. All rights are reserved in the event of a patent grant or registration of a utility model or design.

  • Page 4: Safety Information

    Manufacturers of the cellular terminal should notify users and operating personnel of the following safety information by incorporating these guidelines into all manuals of the product. Otherwise, Quectel assumes no liability for customers’ failure to comply with these precautions.

  • Page 5: About The Document

    NB-IoT Module Series BC65 Hardware Design About the Document Revision History Version Date Author Description Jerry WANG/ 2019-07-19 Jack WU/ Creation of the document Louis GU Jerry WANG/ 2021-02-08 Jack WU/ First official release Louis GU BC65_Hardware_Design 4 / 55...

  • Page 6: Table Of Contents

    NB-IoT Module Series BC65 Hardware Design Contents Safety Information ............................3 About the Document ........................... 4 Contents ............................... 5 Table Index ..............................7 Figure Index ..............................8 Introduction ............................9 1.1. Special Mark ..........................9 Product Concept ..........................10 2.1.
  • Page 7 NB-IoT Module Series BC65 Hardware Design 4.1.2. Antenna Reference Design .................... 36 4.1.3. Antenna Requirements ....................36 4.2. Reference Design of RF Layout ....................37 4.3. Recommended RF Connector for Antenna Installation ............39 Reliability, Radio and Electrical Characteristics ................41 5.1.
  • Page 8 NB-IoT Module Series BC65 Hardware Design Table Index Table 1: Special Mark ........................... 9 Table 1: Frequency Bands of BC65 Module ....................10 Table 2: Key Features ..........................11 Table 3: I/O Parameters Definition ......................16 Table 4: Pin Description ..........................16 Table 5: AP Operating Modes ........................
  • Page 9 NB-IoT Module Series BC65 Hardware Design Figure Index Figure 1: Functional Diagram ........................13 Figure 2: Pin Assignment (Top View) ......................15 Figure 3: Module (Modem) Power Consumption in Different Modes ............20 Figure 4: Timing of Waking Up Module from Deep Sleep................21 Figure 5: Reference Circuit for Power Supply ...................

  • Page 10: Introduction

    NB-IoT Module Series BC65 Hardware Design Introduction This document defines Quectel BC65 module and describes its air interface and hardware interfaces which are connected with your applications. With this document, you can quickly understand module interface specifications, electrical and mechanical details, as well as other related information of the module. This document, coupled with application notes and user guides, makes it easy to design and set up mobile applications with the module.

  • Page 11: Product Concept

    H-FDD B1*/B3/B5/B8/B20/B28 BC65 is an SMD type module with LCC package, and has an ultra-compact profile of 17.7 mm × 15.8 mm × 2.2 mm. These features allow the module to be easily embedded into size-constrained applications and provide reliable connectivity with applications.

  • Page 12: Key Features

    NB-IoT Module Series BC65 Hardware Design 2.2. Key Features The following table describes the detailed features of BC65 module. Table 3: Key Features Feature Details ⚫ Supply voltage range: 3.2–4.2 V Power Supply ⚫ Typical supply voltage: 3.8 V Typical power consumption: 4 μA...

  • Page 13: Functional Diagram

    3GPP. When the temperature returns to the operating temperature range, the module will meet 3GPP specifications again. 2.3. Functional Diagram The following figure shows a block diagram of BC65 and illustrates the major functional parts. ⚫ Radio frequency ⚫...

  • Page 14: Development Board

    Figure 1: Functional Diagram 2.4. Development Board Quectel provides a complete set of development tools to facilitate the use and test of BC65 module. The development tool kit includes the TE-B board, USB cable, antenna and other peripherals. For more details, see Document [1].

  • Page 15: Application Interfaces

    BC65 Hardware Design Application Interfaces 3.1. General Description BC65 is equipped with a total of 58 pins, including 44 LCC pins and 14 LGA pins. The subsequent chapters provide detailed descriptions of the following functions and interfaces: ⚫ Operating Modes ⚫...

  • Page 16: Pin Assignment

    NB-IoT Module Series BC65 Hardware Design 3.2. Pin Assignment ANT_RF RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED BC65 RESERVED RESERVED Top View PWRKEY AUX_TXD AUX_RXD RESERVED RESERVED USIM_DATA RESERVED USIM_RST VDD_EXT USIM_CLK RESERVED UART USIM POWER OTHERS RESERVED Figure 2: Pin Assignment (Top View) NOTE All RESERVED pins should be kept unconnected.

  • Page 17: Pin Description

    NB-IoT Module Series BC65 Hardware Design 3.3. Pin Description Table 4: I/O Parameters Definition Type Description Analog Input Analog Output Digital Input Digital Output Bidirectional Power Input Power Output Table 5: Pin Description Power Supply Pin Name Pin No. Description...
  • Page 18 NB-IoT Module Series BC65 Hardware Design Pin Name Pin No. Description DC Characteristics Comment Turn on the PWRKEY Vnorm = 1.07 V Active Low module Reset Interface Pin Name Pin No. Description DC Characteristics Comment Reset the RESET_N Vnorm = 1.07 V...
  • Page 19 NB-IoT Module Series BC65 Hardware Design Auxiliary UART AUX_RXD receive 1.8 V power domain. Auxiliary UART AUX_TXD transmit Debug UART Interface Pin Name Pin No. Description DC Characteristics Comment Debug UART DBG_RXD receive 1.8 V power domain. Debug UART DBG_TXD...

  • Page 20: Operating Modes

    NB-IoT Module Series BC65 Hardware Design NOTE Unused pins should be kept unconnected. 3.4. Operating Modes The module mainly consists of AP, modem and entire module operating modes, and the tables below describe the NB-IoT operating modes of them. Table 6: AP Operating Modes...

  • Page 21: Power Saving

    NB-IoT Module Series BC65 Hardware Design When the AP is in idle mode and the modem is in PSM, the module will enter Deep Sleep mode in which the CPU is powered off and only the 32 kHz RTC clock is working.

  • Page 22: Power Supply

    Figure 4: Timing of Waking Up Module from Deep Sleep 3.6. Power Supply 3.6.1. Power Supply Pins BC65 provides two VBAT pins for connection with an external power supply. The table below describes the module's VBAT and ground pins. Table 9: Power Supply Pins Pin Name Pin No.

  • Page 23: Reference Design For Power Supply

    Power design for a module is critical to its performance. It is recommended to use a low quiescent current LDO with output current capacity of 0.8 A when supplying power for BC65. A Li-MnO2/2S alkaline battery can also be used as the power supply. The supply voltage of the module ranges from 3.2 to 4.2 V. When the module is working, make sure its input voltage will never drop below 3.2 V;...
  • Page 24 NB-IoT Module Series BC65 Hardware Design It is recommended to use an open drain/collector driver circuit to control the PWRKEY. A simple reference circuit is illustrated in the following figure. PWRKEY 4.7K Turn on pulse Figure 6: Turn on the Module by Using Driver Circuit Another way to control PWRKEY is to use a button directly.

  • Page 25: Turn Off

    It is recommended that the MCU retain the control of RESET_N, for the purpose of resetting the module when abnormal booting occurs due to abnormal power-on timing. 3.7.2. Turn Off BC65 can be turned off by any of the following methods: ⚫ Turn off by AT command AT+QPOWD=1 (see document [2]).

  • Page 26: Reset The Module

    NB-IoT Module Series BC65 Hardware Design > 5 ms VBAT VDD_EXT Module Status Running Figure 9: Turn-off Timing (Turn Off by Disconnecting VBAT) 1.9–14 VBAT AT+QPOWD=1 VDD_EXT Module Status Running Figure 10: Turn-off Timing (Turn Off by AT Command AT+QPOWD=1) 3.7.3.
  • Page 27 NB-IoT Module Series BC65 Hardware Design The recommended circuits of resetting the module are shown below. An open drain/collector driver or button can be used to control the RESET_N pin. RESET_N 4.7K Reset pulse Figure 11: Reference Circuit of RESET_N by Using Driving Circuit...

  • Page 28: Uart Interfaces

    NB-IoT Module Series BC65 Hardware Design The reset timing is illustrated in the following figure. VBAT ≥ 1 s > 900 ms RESET_N VDD_EXT Module Status Running Resetting Restart Figure 13: Reset Timing 3.8. UART Interfaces The module provides three UART interfaces: one main UART, one debug UART and one auxiliary UART*.

  • Page 29: Main Uart Interface

    NB-IoT Module Series BC65 Hardware Design 3.8.1. Main UART Interface The main UART interface can be used for AT command communication and data transmission, and in such case, the baud rates should be 4800 bps, 9600 bps (default) and 57600 bps. The main UART interface is available in active mode and idle mode.

  • Page 30: Auxiliary Uart Interface

    NB-IoT Module Series BC65 Hardware Design 3.8.3. Auxiliary UART Interface* The auxiliary UART interface is designed as a general-purpose UART for communication with DTE. Its baud rates are 4800 bps, 9600 bps (default), and 57600 bps. The following is a reference design for auxiliary UART interface.
  • Page 31 NB-IoT Module Series BC65 Hardware Design Another example with transistor translation circuit is shown as below. For the design of circuits shown in dotted lines, see that shown in solid lines, but pay attention to the direction of connection. 4.7 kΩ...

  • Page 32: Usim Interface

    NB-IoT Module Series BC65 Hardware Design Visit vendors’ websites to select a suitable RS-232 transceiver, such as: http://www.exar.com and http://www.maximintegrated.com. NOTES Transistor circuit solution is not suitable for applications with high baud rates exceeding 460 kbps. “ ” represents the test point of UART interfaces. It is also recommended to reserve the test points of VBAT and PWRKEY for convenient firmware upgrading and debugging when necessary.
  • Page 33 NB-IoT Module Series BC65 Hardware Design A reference circuit design for USIM interface with a 6-pin USIM card connector is illustrated below. 100 nF USIM Card Connector USIM_VDD 22 Ω USIM_RST Module 22 Ω USIM_CLK 10 kΩ 22 Ω USIM_DATA...

  • Page 34: Adc Interface

    NB-IoT Module Series BC65 Hardware Design 3.10. ADC Interface The module provides one Analog-to-Digital Converter (ADC) interface. The interface is available in active and idle modes. Table 14: Pin Definition of ADC Interface Pin Name Pin No. Description Comment General-purpose ADC interface 0–1.8 V...
  • Page 35 NB-IoT Module Series BC65 Hardware Design 64 ms High (LED On)/800 ms Low (LED OFF) Network searching 64 ms High (LED On)/2000 ms Low (LED OFF) Network connected A reference circuit is shown as below. VBAT Module 2.2K 4.7K NETLIGHT...

  • Page 36: Antenna Interface

    NB-IoT Module Series BC65 Hardware Design Antenna Interface Pin 35 is the module’s NB-IoT antenna interface, whose characteristic impedance is 50 Ω. 4.1. Antenna Interface Table 16: Pin Definition of the NB-IoT Antenna Interface Pin Name Pin No. Description ANT_RF...

  • Page 37: Antenna Reference Design

    50 Ω. ⚫ BC65 comes with ground pins which are next to the antenna pin to give a better grounding. ⚫ To achieve better RF performance, it is recommended to reserve a π-type matching circuit and place the π-type matching components (R1/C1/C2) as close to the antenna as possible.

  • Page 38: Reference Design Of Rf Layout

    NB-IoT Module Series BC65 Hardware Design Table 19: Required NB-IoT Antenna Parameters Parameters Requirements Frequency range 703–2170 MHz ≤ 2 VSWR Efficiency > 30 % Max input power (W) Input impedance (Ω) 4.2. Reference Design of RF Layout For user’s PCB, the characteristic impedance of all RF traces should be controlled to 50 Ω. The impedance of the RF traces is usually determined by the trace width (W), the materials’...
  • Page 39 NB-IoT Module Series BC65 Hardware Design Figure 26: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) Figure 27: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) To ensure RF performance and reliability, the following principles should be complied with in RF layout design: ⚫...

  • Page 40: Recommended Rf Connector For Antenna Installation

    NB-IoT Module Series BC65 Hardware Design 4.3. Recommended RF Connector for Antenna Installation If RF connector is used for antenna connection, it is recommended to use the U.FL-R-SMT connector provided by HIROSE. Figure 28: Dimensions of the U.FL-R-SMT Connector (Unit: mm) (Note) Tolerance value of mold resin applied to center contact.
  • Page 41 NB-IoT Module Series BC65 Hardware Design U.FL-LP serial connectors listed in the following figure can be used to match the U.FL-R-SMT. Figure 29: Mechanicals of U.FL-LP Connectors The following figure describes the space factor of mated connector. Figure 30: Space Factor of Mated Connector (Unit: mm) For more details, visit http://www.hirose.com.

  • Page 42: Reliability, Radio And Electrical Characteristics

    NB-IoT Module Series BC65 Hardware Design Reliability, Radio and Electrical Characteristics 5.1. Operating and Storage Temperatures The following table lists the operating and storage temperatures of BC65. Table 20: Operating and Storage Temperatures Parameter Min. Typ. Max. Unit Operating Temperature Range º...

  • Page 43: Current Consumption

    NB-IoT Module Series BC65 Hardware Design 5.2. Current Consumption The table below lists the current consumption of BC65 under different modes. Table 21: Module Current Consumption (3.8 V VBAT Power Supply) Parameter Mode Description Band Typ. Unit μA Deep Sleep...

  • Page 44: Rf Output Power

    NB-IoT Module Series BC65 Hardware Design Active mode Radio transmission @ Multi-tone (15 kHz) 23 dBm 5.3. RF Output Power Table 22: RF Conducted Output Power Band Max RF Output Power Min RF Output Power 23 dBm ± 2 dB <...

  • Page 45: Electrostatic Discharge

    NB-IoT Module Series BC65 Hardware Design -114 dBm -107.5 dBm -114 dBm -107.5 dBm -114 dBm -107.5 dBm Table 24: RF Receiving Sensitivity in 128 Retransmissions (Throughput ≥ 95 %) Band Receiving Sensitivity -129 dBm -129 dBm -129 dBm -129 dBm -129 dBm 5.5.

  • Page 46: Mechanical Dimensions

    NB-IoT Module Series BC65 Hardware Design Mechanical Dimensions This chapter describes the mechanical dimensions of the module. All dimensions are measured in millimetre (mm), and dimensional tolerances are ± 0.05 mm unless otherwise specified. 6.1. Mechanical Dimensions of the Module...
  • Page 47 NB-IoT Module Series BC65 Hardware Design Figure 32: Module Bottom Dimension (Bottom View, Unit: mm) NOTE The package warpage level of the module conforms to the JEITA ED-7306 standard. BC65_Hardware_Design 46 / 55...

  • Page 48: Recommended Footprint

    NB-IoT Module Series BC65 Hardware Design 6.2. Recommended Footprint Pin 1 Figure 33: Recommended Footprint (Top View, Unit: mm) NOTE For easy maintenance of the module, keep about 3 mm between the module and other components on the motherboard. BC65_Hardware_Design...

  • Page 49: Top And Bottom Views Of The Module

    Figure 34: Top View of the Module Figure 35: Bottom View of the Module NOTE Images above are for illustration purpose only and may differ from the actual module. For authentic appearance and label, please refer to the module received from Quectel. BC65_Hardware_Design 48 / 55...

  • Page 50: Storage, Manufacturing And Packaging

    NB-IoT Module Series BC65 Hardware Design Storage, Manufacturing and Packaging 7.1. Storage The module is provided with vacuum-sealed packaging. MSL of the module is rated as 3. The storage requirements are shown below. 1. Recommended Storage Condition: The temperature should be 23 ± 5 ° C and the relative humidity should be 35–60 %.

  • Page 51: Manufacturing And Soldering

    NB-IoT Module Series BC65 Hardware Design NOTES This floor life is only applicable when the environment conforms to IPC/JEDEC J-STD-033. 2. To avoid blistering, layer separation and other soldering issues, it is forbidden to expose the modules to the air for a long time. If the temperature and moisture do not conform to IPC/JEDEC J-STD-033 or the relative moisture is over 60 %, it is recommended to start the solder reflow process within 24 hours after the package is removed.

  • Page 52: Packaging

    NB-IoT Module Series BC65 Hardware Design Table 26: Recommended Thermal Profile Parameters Factor Recommendation Soak Zone Max slope 1 to 3 ° C/s Soak time (between A and B: 150 ° C and 200 ° C) 70–120 s Reflow Zone Max slope 2 to 3 °...
  • Page 53 NB-IoT Module Series BC65 Hardware Design Figure 37: Tape Dimensions (Unit: mm) Figure 38: Reel Dimensions (Unit: mm) BC65_Hardware_Design 52 / 55...

  • Page 54: Appendix Reference

    BC65 Hardware Design Appendix Reference Table 27: Related Documents Document Name Description Quectel_BC65-TE-B_User_Guide BC65-TE-B User Guide Quectel_BC65_AT_Commands_Manual The AT commands manual of BC65 Quectel_RF_Layout_Application_Note RF Layout Application Note Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide Table 28: Terms and Abbreviations Abbreviation Description...
  • Page 55 NB-IoT Module Series BC65 Hardware Design Input/Output kbps Kilo Bits Per Second Low Band Low-dropout Regulator Light Emitting Diode Li-MnO2 Lithium-manganese Dioxide Low Power Mode Long Term Evolution MQTT Message Queuing Telemetry Transport NB-IoT arrow Band- Internet of Things Power Amplifier...
  • Page 56 NB-IoT Module Series BC65 Hardware Design UART Universal Asynchronous Receiver & Transmitter User Datagram Protocol Unsolicited Result Code USIM Universal Subscriber Identification Module VSWR Voltage Standing Wave Ratio Vmax Maximum Voltage Value Vnorm Normal Voltage Value Vmin Minimum Voltage Value...

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