Quectel Wireless Solutions 201808BC66 Users Manual

BC66 Hardware Design

NB-IoT Module Series

Rev. BC66_Hardware_Design_V1.1

Date: 2018-11-14

Status: Released

www.quectel.com

NB-IoT Module Series

BC66 Hardware Design

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NB-IoT Module Series

BC66 Hardware Design

About the Document

History

Revision Date Author Description

1.0 2018-08-24

1.1 2018-11-14 Newgate HUA

Speed SUN/

Newgate HUA

Initial

Updated supported bands and involved RF parameters of

BC66.

BC66_Hardware_Design 2 / 57

NB-IoT Module Series

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Contents

About the Document ................................................................................................................................ 2

Contents .................................................................................................................................................... 3

Table Index ............................................................................................................................................... 5

Figure Index .............................................................................................................................................. 6

1 Introduction ....................................................................................................................................... 7

1.1. Safety Information .................................................................................................................... 8

2 Product Concept ............................................................................................................................... 9

2.1. General Description .................................................................................................................. 9

2.2. Key Features .......................................................................................................................... 10

2.3. Functional Diagram .................................................................................................................11

2.4. Development Board ................................................................................................................ 12

3 Application Interfaces ..................................................................................................................... 13

3.1. General Description ................................................................................................................ 13

3.2. Pin Assignment ....................................................................................................................... 14

3.3. Pin Description ....................................................................................................................... 15

3.4. Operating Modes .................................................................................................................... 18

3.5. Power Saving Mode (PSM) .................................................................................................... 19

3.6. Power Supply ......................................................................................................................... 20

3.6.1. Power Supply Pins ....................................................................................................... 20

3.6.2. Reference Design for Power Supply ............................................................................ 21

3.7. Power up/Power down Scenarios ........................................................................................... 21

3.7.1. Turn on ........................................................................................................................ 21

3.7.2. Turn off ........................................................................................................................ 23

3.7.3. Reset the Module ......................................................................................................... 24

3.8. UART Interfaces ..................................................................................................................... 25

3.8.1. Main UART Port ........................................................................................................... 26

3.8.2. Debug UART Port ........................................................................................................ 26

3.8.3. Auxiliary UART Port ..................................................................................................... 27

3.8.4. UART Application ......................................................................................................... 27

3.9. SPI Interface ........................................................................................................................... 29

3.10. USIM Interface ....................................................................................................................... 30

3.11. ADC Interface ......................................................................................................................... 32

3.12. RI Behaviors* ......................................................................................................................... 32

3.13. Network Status Indication* ...................................................................................................... 32

4

Antenna Interface ............................................................................................................................ 34

4.1. Pin Definition .......................................................................................................................... 34

4.2. Operating Frequencies ........................................................................................................... 34

4.3. RF Antenna Reference Design ............................................................................................... 35

4.4. Reference Design of RF Layout ............................................................................................. 36

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4.5. Antenna Requirements ........................................................................................................... 38

4.6. RF Output Power .................................................................................................................... 39

4.7. RF Receiving Sensitivity ......................................................................................................... 40

4.8. Recommended RF Connector for Antenna Installation ........................................................... 41

5 Electrical and Reliability Characteristics ...................................................................................... 43

5.1. Operation and Storage Temperatures ..................................................................................... 43

5.2. Current Consumption ............................................................................................................. 43

5.3. Electrostatic Discharge ........................................................................................................... 45

6 Mechanical Dimensions.................................................................................................................. 47

6.1. Mechanical Dimensions of the Module ................................................................................... 47

6.2. Recommended Footprint ........................................................................................................ 49

6.3. Top and Bottom Views of the Module ..................................................................................... 50

7 Storage, Manufacturing and Packaging ........................................................................................ 51

7.1. Storage ................................................................................................................................... 51

7.2. Manufacturing and Soldering .................................................................................................. 52

7.3. Packaging ............................................................................................................................... 53

7.3.1. Tape and Reel Packaging ............................................................................................ 53

8 Appendix A References .................................................................................................................. 55

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Table Index

TABLE 1: FREQUENCY BANDS OF BC66 MODULE ........................................................................................ 9

TABLE 2: BC66 KEY FEATURES ..................................................................................................................... 10

TABLE 3: I/O PARAMETERS DEFINITION ....................................................................................................... 15

TABLE 4: PIN DESCRIPTION ........................................................................................................................... 15

TABLE 5: OVERVIEW OF OPERATING MODES ............................................................................................. 18

TABLE 6: POWER SUPPLY PINS ..................................................................................................................... 20

TABLE 7: PWRKEY PIN .................................................................................................................................... 21

TABLE 8: RESET PIN ........................................................................................................................................ 24

TABLE 9: PIN DEFINITION OF UART INTERFACES ....................................................................................... 25

TABLE 10: PIN DEFINITION OF SPI INTERFACE ........................................................................................... 30

TABLE 11: PIN DEFINITION OF USIM INTERFACE ........................................................................................ 31

TABLE 12: PIN DEFINITION OF ADC INTERFACE ......................................................................................... 32

TABLE 13: PIN DEFINITION OF NB-IOT ANTENNA INTERFACE ................................................................... 34

TABLE 14: MODULE OPERATING FREQUENCIES ........................................................................................ 34

TABLE 15: ANTENNA CABLE INSERTION LOSS REQUIREMENTS ............................................................. 38

TABLE 16: REQUIRED ANTENNA PARAMETERS .......................................................................................... 38

TABLE 17: RF CONDUCTED OUTPUT POWER ............................................................................................. 39

TABLE 18: RECEIVING SENSITIVITY (WITH RF RETRANSMISSIONS) ....................................................... 40

TABLE 19: OPERATION AND STORAGE TEMPERATURES .......................................................................... 43

TABLE 20: MODULE CURRENT CONSUMPTION .......................................................................................... 44

TABLE 21: ELECTROSTATIC DISCHARGE CHARACTERISTICS (25ºC, 45% RELATIVE HUMIDITY) ........ 46

TABLE 22: RECOMMENDED THERMAL PROFILE PARAMETERS ............................................................... 52

TABLE 23: RELATED DOCUMENTS ................................................................................................................ 55

TABLE 24: TERMS AND ABBREVIATIONS ...................................................................................................... 55

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Figure Index

FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 12

FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 14

FIGURE 3: MODULE POWER CONSUMPTION IN DIFFERENT MODES ...................................................... 19

FIGURE 4: TIMING OF WAKING UP MODULE FROM PSM ........................................................................... 20

FIGURE 5: REFERENCE CIRCUIT FOR POWER SUPPLY ............................................................................ 21

FIGURE 6: TURN ON THE MODULE USING DRIVING CIRCUIT ................................................................... 22

FIGURE 7: TURN ON THE MODULE USING KEYSTROKE ........................................................................... 22

FIGURE 8: POWER UP TIMING ....................................................................................................................... 22

FIGURE 9: POWER DOWN TIMING (POWER OFF BY AT COMMAND) ........................................................ 23

FIGURE 10: POWER DOWN TIMING (POWER OFF BY DISCONNECTING VBAT) ...................................... 23

FIGURE 11: REFERENCE CIRCUIT OF RESET BY USING DRIVING CIRCUIT ........................................... 24

FIGURE 12: REFERENCE CIRCUIT OF RESET BY USING BUTTON ........................................................... 24

FIGURE 13: RESET TIMING ............................................................................................................................. 25

FIGURE 14: REFERENCE DESIGN FOR MAIN UART PORT ........................................................................ 26

FIGURE 15: REFERENCE DESIGN OF DEBUG UART PORT ....................................................................... 27

FIGURE 16: REFERENCE DESIGN OF AUXILIARY UART PORT .................................................................. 27

FIGURE 17: REFERENCE CIRCUIT WITH VOLTAGE LEVEL TRANSLATOR CHIP ...................................... 28

FIGURE 18: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT .............................................................. 28

FIGURE 19: SKETCH MAP FOR RS-232 INTERFACE MATCH ...................................................................... 29

FIGURE 20: SPI INTERFACE REFERENCE CIRCUIT WITH TRANSLATOR CHIP ....................................... 30

FIGURE 21: REFERENCE CIRCUIT FOR USIM INTERFACE WITH A 6-PIN USIM CARD CONNECTOR ... 31

FIGURE 22: REFERENCE DESIGN FOR NETLIGHT ..................................................................................... 33

FIGURE 23: REFERENCE DESIGN OF NB-IOT ANTENNA INTERFACE ...................................................... 36

FIGURE 24: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB ...................................................................... 36

FIGURE 25: COPLANAR WAVEGUIDE LINE DESIGN ON A 2-LAYER PCB .................................................. 37

FIGURE 26: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE

GROUND) .................................................................................................................................................. 37

FIGURE 27: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE

GROUND) .................................................................................................................................................. 37

FIGURE 28: DIMENSIONS OF THE U.FL-R-SMT CONNECTOR (UNIT: MM) ................................................ 41

FIGURE 29: MECHANICALS OF U.FL-LP CONNECTORS ............................................................................. 41

FIGURE 30: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 42

FIGURE 31: TOP VIEW OF THE MODULE ...................................................................................................... 50

FIGURE 32: BOTTOM VIEW OF THE MODULE .............................................................................................. 50

FIGURE 33: TAPE DIMENSIONS (UNIT: MM) .................................................................................................. 54

FIGURE 34: REEL DIMENSIONS (UNIT: MM) ................................................................................................. 54





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NB-IoT Module Series

BC66 Hardware Design

1 Introduction

This document defines the BC66 module and describes its air interface and hardware interface which are

connected with the customers’ applications.

This document can help customers quickly understand module interface specifications, electrical and

mechanical details, as well as other related information of the module. Associated with application notes

and user guides, customers can use BC66 to design and set up mobile applications easily.

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NB-IoT Module Series

BC66 Hardware Design

1.1. Safety Information

The following safety precautions must be observed during all phases of the operation, such as usage,

service or repair of any cellular terminal or mobile incorporating BC66 module. Manufacturers of the

cellular terminal should send the following safety information to users and operating personnel, and

incorporate these guidelines into all manuals supplied with the product. If not so, Quectel assumes no

liability for customers’ failure to comply with these precautions.

Full attention must be given to driving at all times in order to reduce the risk of an

accident. Using a mobile while driving (even with a handsfree kit) causes

distraction and can lead to an accident. Please comply with laws and regulations

restricting the use of wireless devices while driving.

Switch off the cellular terminal or mobile before boarding an aircraft. The operation

of wireless appliances in an aircraft is forbidden to prevent interference with

communication systems. If the device offers an Airplane Mode, then it should be

enabled prior to boarding an aircraft. Please consult the airline staff for more

restrictions on the use of wireless devices on boarding the aircraft.



Wireless devices may cause interference on sensitive medical equipment, so

please be aware of the restrictions on the use of wireless devices when in

hospitals, clinics or other healthcare facilities.

Cellular terminals or mobiles operating over radio signals and cellular network

cannot be guaranteed to connect in all possible conditions (for example, with

unpaid bills or with an invalid (U)SIM card). When emergent help is needed in such

conditions, please remember using emergency call. In order to make or receive a

call, the cellular terminal or mobile must be switched on in a service area with

adequate cellular signal strength.



The cellular terminal or mobile contains a transmitter and receiver. When it is ON, it

receives and transmits radio frequency signals. RF interference can occur if it is

used close to TV set, radio, computer or other electric equipment.

In locations with potentially explosive atmospheres, obey all posted signs to turn

off wireless devices such as your phone or other cellular terminals. Areas with

potentially explosive atmospheres include fuelling areas, below decks on boats,

fuel or chemical transfer or storage facilities, areas where the air contains

chemicals or particles such as grain, dust or metal powders, etc.

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NB-IoT Module Series

BC66 Hardware Design

2 Product Concept

2.1. General Description

BC66 is a high-performance NB-IoT module with extremely low power consumption. It is designed to

communicate with infrastructures of mobile network operators through NB-IoT radio protocols (3GPP

Rel.13 and 3GPP Rel.14*). BC66 supports a broad range of frequency bands as listed below.

Table 1: Frequency Bands of BC66 Module

Mode BC66

H-FDD B1/B2/B3/B4/B5/B8/B12/B13/B17/B18/B19/B20/B25/B26*/B28/B66

BC66 is an SMD type module with LCC package, and has an ultra-compact profile of 17.7mm × 15.8mm ×

2.0mm. These make it can be easily embedded into size-constrained applications and provide reliable

connectivity with the applications.

BC66 provides abundant external interfaces (UART, SPI*, ADC*, NETLIGHT*, etc.) and protocol stacks

(UDP/TCP, LwM2M, MQTT, etc.), which provide great convenience for customers' applications.

Due to compact form factor, ultra-low power consumption and extended temperature range, BC66 is a

best choice for a wide range of IoT applications, such as smart metering, bike sharing, smart wearables,

smart parking, smart city, home appliances, security and asset tracking, agricultural and environmental

monitoring, etc. It is able to provide a complete range of SMS* and data transmission services to meet

customers’ demands.

The module fully complies with the RoHS directive of the European Union.

NOTE

“*” means under development.

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NB-IoT Module Series

BC66 Hardware Design

2.2. Key Features

The following table describes the detailed features of BC66 module.

Table 2: BC66 Key Features

Feature Details

Power Supply

Power Saving

Frequency bands

 Supply voltage: 2.1V ~ 3.63V

 Typical supply voltage: 3.3V

 Maximum power consumption: 5μA

 Typical power consumption: 3.5μA

LTE Cat NB1:

 B1/B2/B3/B4/B5/B8/B12/B13/B17/B18/B19/B20/B25/B26*/B28/B66

Transmitting Power  23dBm±2dB

USIM Interface  Support 1.8V USIM card

Main UART Port:

 Used for AT command communication and data transmission.

 By default, the module is in auto-baud mode, and it supports automatic

baud rates not exceeding 115200bps. When powering on the module, the

MCU has to send AT command consecutively to synchronize baud rate
with the module. When OK is returned, it indicates the baud rate has been

synchronized successfully. When the module is woken up from PSM or

UART Interfaces

idle mode, the baud rate synchronized during start-up will be used directly.

 Also can be used for firmware upgrade, and in such case, the baud rate is

921600bps by default.

Debug UART Port:

 Used for firmware debugging

 Default baud rate: 115200bps

Auxiliary UART Port:

 Used for firmware debugging

 Default baud rate: 115200bps

Network Protocols  UDP/TCP/LwM2M/MQTT/CoAP*/PPP*/TLS*/DTLS*/HTTP*/HTTPS*

SMS*  Text/PDU Mode

Data Transmission

Features

AT Commands

 Single-tone: 25.5kbps (DL)/16.7kbps (UL)

 Multi-tone: 25.5kbps (DL )/62.5kbps (UL)

 3GPP TS 27.005/3GPP TS 27.007 AT commands (3GPP Rel. 13/Rel.14*)

and Quectel Enhanced AT commands

Firmware Update  Upgrade firmware via main UART port or DFOTA

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Real Time Clock  Supported

Physical

Characteristics

Temperature Range

 Size: (17.7±0.15)mm × (15.8±0.15)mm × (2.0±0.2)mm

 Weight: 1.2g±0.2g

1)

 Operation temperature range: -35°C ~ +75°C

 Extended temperature range: -40°C ~ +85°C

2)

 Storage temperature range: -40°C ~ +90°C

Antenna Interface  50Ω impedance control

RoHS  All hardware components are fully compliant with EU RoHS directive

NOTES

1)

1.

Within operation temperature range, the module is 3GPP compliant.

2)

2.

Within extended temperature range, the module remains the ability to establish and maintain an

SMS*, data transmission, etc. There is no unrecoverable malfunction. There are also no effects on

radio spectrum and no harm to radio network. Only one or more parameters like P

might reduce in

out

their value and exceed the specified tolerances. When the temperature returns to normal operation

temperature levels, the module will meet 3GPP specifications again.

3. "*" means under development.

2.3. Functional Diagram

The following figure shows a block diagram of BC66 and illustrates the major functional parts.

 Radio frequency

 Baseband

 Power management

 Peripheral interfaces

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NB-IoT Module Series

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Figure 1: Functional Diagram

NOTE

“*” means under development.

2.4. Development Board

Quectel provides a complete set of development tools to facilitate the use and testing of BC66 module.

The development tool kit includes the TE-B board, USB cable, antenna and other peripherals. For more

details, please refer to document [1].

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NB-IoT Module Series

BC66 Hardware Design

3 Application Interfaces

3.1. General Description

BC66 is equipped with a total of 58 pins, including 44 LCC pins and 14 LGA pins. The subsequent

chapters will provide detailed descriptions of the following functions/pins/interfaces:

 PSM

 Power Supply

 RESET

 PWRKEY

 UART Interfaces

 SPI Interface

 USIM Interface

 ADC Interface

 Network Status Indication*

 Antenna Interface

NOTE

“*” means under development.

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NB-IoT Module Series

BC66 Hardware Design

3.2. Pin Assignment

Figure 2: Pin Assignment

NOTES

1. Keep all reserved pins unconnected.

2. “*” means under development.

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3.3. Pin Description

Table 3: I/O Parameters Definition

Type Description

IO Bidirectional

DI Digital input

DO Digital output

PI Power input

PO Power output

AI Analog input

AO Analog output

Table 4: Pin Description

Power Supply

Pin Name Pin No. I/O Description DC Characteristics Comment

VBAT_BB 42 PI

VBAT_RF 43 PI

Power supply for

the module’s

baseband part

Power supply for

the module’s RF

part

Vmax=3.63V

Vmin=2.1V

Vnorm=3.3V

Vmax=3.63V

Vmin=2.1V

Vnorm=3.3V

No voltage output in

PSM mode.

It is intended to supply

VDD_

EXT

24 PO

1.8V output

power supply

Vnorm=1.8V

power for the module’s

pull-up circuits, and is

thus not recommended

to be used as the

power supply for

external circuits.

1, 27, 34,

GND

36, 37, 40,

GND

41

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Power Key Interface

Pin Name Pin No. I/O Description DC Characteristics Comment

PWRKEY 7 DI

Pull down

PWRKEY to turn

on the module

V

max=0.3*VBAT

IL

V

min=0.7*VBAT

IH

Reset Interface

Pin Name Pin No. I/O Description DC Characteristics Comment

RESET 15 DI Reset the module Active low.

PSM_EINT Interface

Pin Name Pin No. I/O Description DC Characteristics Comment

Dedicated

external interrupt

PSM_EINT 19 DI

pin.

Used to wake up

the module from

PSM.

Network Status Indication

Pin Name Pin No. I/O Description DC Characteristics Comment

NETLIGHT* 16 DO

Network status

indication

ADC Interface

Pin Name Pin No. I/O Description DC Characteristics Comment

General purpose

ADC0* 9 AI

analog to digital

converter

Voltage range:

0V~1.4V

interface

Main UART Port

Pin Name Pin No. I/O Description DC Characteristics Comment

RXD 18 DI Receive data

1.8V power domain.

TXD 17 DO Transmit data

Auxiliary UART Port

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Pin Name Pin No. I/O Description DC Characteristics Comment

RXD_AUX 28 DI Receive data

1.8V power domain.

TXD_AUX 29 DO Transmit data

Debug UART Port

Pin Name Pin No. I/O Description DC Characteristics Comment

RXD_DBG 38 DI Receive data

1.8V power domain.

TXD_DBG 39 DO Transmit data

Ringing Signal

Pin Name Pin No. I/O Description DC Characteristics Comment

RI* 20 DO Ring indicator 1.8V power domain.

USIM Interface

Pin Name Pin No. I/O Description DC Characteristics Comment

SIM_VDD 14 DO

SIM_RST 12 DO

SIM_DATA 11 IO

SIM_CLK 13 DO

USIM card

power supply

USIM card reset

signal

USIM card data

signal

USIM card clock

signal

Vnorm=1.8V

V

max=0.15×SIM_VDD

OL

V

min=0.85×SIM_VDD

OH

V

max=0.25×SIM_VDD

IL

VIHmin=0.75×SIM_VDD

max=0.15×SIM_VDD

V

OL

min=0.85×SIM_VDD

V

OH

V

max=0.15×SIM_VDD

OL

V

min=0.85×SIM_VDD

OH

Specified

SIM_GND 10 GND

ground for USIM

card

Antenna Interface

Pin Name Pin No. I/O Description DC Characteristics Comment

RF_ANT 35 IO

RF antenna

interface

50Ω characteristic

impedance

SPI Interface

Pin Name Pin No. I/O Description DC Characteristics Comment

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Master input

SPI_MISO* 3 DI

slave output of

SPI interface

Master output

SPI_MOSI* 4 DO

slave input of SPI

interface

1.8V power domain.

Serial clock

SPI_SCLK* 5 DO

signal of SPI

interface

SPI_CS* 6 DO

Chip select of

SPI interface

Reserved Pins

Pin Name Pin No. I/O Description DC Characteristics Comment

2, 8,

RESERVED

21~23,

25~26,

30~33,

Keep these pins

unconnected.

44~58

NOTES

1. Keep all unused pins unconnected.

2. “*” means under development.

3.4. Operating Modes

The following table briefly describes the three operating modes of the module.

Table 5: Overview of Operating Modes

Mode Function

In active mode, all functions of the module are available and all

Active

Normal Operation

Idle

BC66_Hardware_Design 18 / 57

processors are active; radio transmission and reception can be

performed. Transitions to idle mode or PSM can be initiated in active

mode.

In idle mode, the module is in light sleep and network connection is

maintained in DRX/eDRX state; paging messages can be received.

Transitions to active mode or PSM can be initiated in idle mode.