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Summary of Contents for Quectel BC68
- Page 1 BC68&M66 Compatible Design NB-IoT/GSM/GPRS Module Series Rev. BC68&M66_Compatible_Design_V1.0 Date: 2018-03-22 Status: Released www.quectel.com...
- Page 2 QUECTEL OFFERS THE INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED IS BASED UPON CUSTOMERS’ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION.
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Page 3: About The Document
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design About the Document History Revision Date Author Description 2018-03-22 Power JIN Initial BC68&M66_Compatible_Design 2 / 31... -
Page 4: Table Of Contents
Recommended Stencil Design ....................25 5.3. Installation Sketch Map ......................27 Manufacturing and Packaging ......................28 6.1. Soldering ..........................28 6.2. Packaging ..........................29 6.2.1. BC68 and M66 Packaging ..................... 29 Appendix A References ........................30 BC68&M66_Compatible_Design 3 / 31... - Page 5 TABLE 1: MODULE GENERAL INFORMATION ....................7 TABLE 2: FEATURES OVERVIEW ........................8 TABLE 3: I/O PARAMETERS DEFINITION ......................11 TABLE 4: PIN COMPARISON BETWEEN BC68 AND M66 ................11 TABLE 5: UART INTERFACE VOLTAGE DOMAIN................... 20 TABLE 6: RELATED DOCUMENTS ........................30 TABLE 7: TERMS AND ABBREVIATIONS ......................
- Page 6 CONNECTOR ............................19 FIGURE 12: REFERENCE DESIGN OF M66 UART INTERFACE ..............20 FIGURE 13: REFERENCE DESIGN OF BC68 UART INTERFACE FOR 3.3V SYSTEM ........ 21 FIGURE 14: REFERENCE CIRCUIT OF RF INTERFACE ................22 FIGURE 15: BOTTOM VIEW OF BC68/M66 ....................23 FIGURE 16: RECOMMENDED FOOTPRINT OF BC68/M66 (UNIT: MM) ............
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Page 7: Introduction
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design Introduction Quectel BC68 is a high-performance NB-IoT module compatible with Quectel GSM/GPRS M66 module. This document briefly describes the compatible design between BC68 and M66 modules. BC68&M66_Compatible_Design 6 / 31... -
Page 8: General Descriptions
DCS1800MHz and PCS1900MHz. The M66 features GPRS multi-slot class 12 and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. BC68 is a high-performance NB-IoT module with low power consumption. BC68 and M66 are designed as compatible products. Customers can choose a proper module according to specific application demands. -
Page 9: Features Overview
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design 2.2. Features Overview The following table compares general properties and features of BC68 and M66 modules. Table 2: Features Overview Feature BC68 3.1V~4.2V 3.3V~4.6V Power Supply Typ. 3.6V Typ. 4.0V Peak Current VBAT: Max 0.8A VBAT: Max 0.8A... - Page 10 GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design Two analog output channels ADC* Supported Vnorm=2.8V RTC Backup Not supported VI=1.5V~3.3V PCM Interface Not supported Supported Firmware Upgrade UART, DFOTA UART NOTES Within operation temperature range, the module is 3GPP compliant. Within extended temperature range, the module remains the ability to establish and maintain a voice, SMS, data transmission, emergency call, etc.
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Page 11: Pin Assignment
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design 2.3. Pin Assignment The following figure shows the pin assignment of BC68 and M66. RF_ANT AGND RF_ANT RESERVED SPK2P PCM_OUT RESERVED RESERVED MICP PCM_IN MICN RESERVED RESERVED PCM_SYNC SPK1P RESERVED RESERVED PCM_CLK RESERVED SPK1N... -
Page 12: Pin Description
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design Pin Description This chapter describes the pin definition of BC68 and M66, as well as the pin comparison between them. Table 3: I/O Parameters Definition Symbol Description Bidirectional Digital Input Digital Output Power Input... - Page 13 GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design Channel 1 RESERVED SPK1P Positive voice output Channel 1 RESERVED SPK1N Negative voice output Used to power on/off the RESERVED PWRKEY module Reference voltage of RESERVED AVDD ADC circuit General purpose General purpose analog...
- Page 14 BC68 are additional pins compared with M66. Keep all reserved and unused pins unconnected. All GND pins should be connected to ground. “*” means under development.
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Page 15: Hardware Reference Design
4.1.2. Reduce Voltage Drop The power supply range of BC68 is from 3.1V to 4.2V. The power supply range of M66 is 3.3V to 4.6V Attention should be paid to the range of the power source to make sure that the input voltage will never drop below 3.3V and never exceed 4.2V. -
Page 16: Power-On Circuit
4.2. Power-on Circuit The turn-on method of BC68 is different from M66. BC68 can be powered on automatically when VBAT pins are powered. M66 will be powered on by driving the pin PWRKEY to a low level voltage for more than 100ms, and an open collector driver circuit is suggested to control the PWRKEY. -
Page 17: Power-Off Circuit
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design The power-on scenario of BC68 and M66 are illustrated in the figure below. VBAT >1s > 0.6*VBAT PWRKEY <0.1*VBAT (INPUT) 54ms VDD_EXT (OUTPUT) BOOTING RUNNING BC68 BOOTING Figure 5: Timing of Power-on Scenario NOTES 1. -
Page 18: Power Down M66 Using Pwrkey Pin
The time for the module to log out from network depends on local network quality. 4.3.2. Power down M66 Using PWRKEY Pin It is a safe way to turn off M66 module by driving PWRKEY to a low level voltage for 0.7s~1s, while BC68 could not be turned off by this pin. -
Page 19: Reset Bc68
The BC68 can be reset by the following two ways: Hardware The module can be reset by driving RESET to a low level voltage for more than 100ms. The reset scenario for BC68 by RESET is illustrated in the figure below. BC68 RESET >100ms 4.7K... -
Page 20: Network Status Indication
Figure 10: Reference Circuit of NETLIGHT 4.6. (U)SIM Interface M66 supports 1.8V or 3.0V SIM/USIM cards, while BC68 supports 1.8V or 3.0V USIM cards. The pin assignment of BC68’s USIM interface and M66’s (U)SIM interface is compatible. The following figure shows a reference design for (U)SIM interface with a 6-pin (U)SIM card connector. -
Page 21: Uart Interfaces
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design 4.7. UART Interfaces The voltage domain of UART interface for BC68 is different from that of M66. The following is the voltage domain of the modules. Table 5: UART Interface Voltage Domain Module UART Interface... -
Page 22: Adc Interface
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design If the DTE is 3.0V or 3.3V power domain, a reference design of 3.3V level match for BC68 is shown as below. BC68 VBAT VBAT TXD RXD Voltage level: 3.3V RESET RESET TEST POINTS Figure 13: Reference Design of BC68 UART Interface for 3.3V System... -
Page 23: Rf Antenna Interface
BC68&M66 Compatible Design 4.9. RF Antenna Interface RF_ANT and BT_ANT of M66 are compatible to RF_ANT of BC68. The RF antenna interface has an impedance of 50Ω. A reference circuit for the interface is shown below. In order to achieve better RF performance, a π-type matching circuit should be reserved, and... -
Page 24: Recommended Footprint And Stencil Design
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design Recommended Footprint and Stencil Design This chapter mainly introduces the recommended footprint and stencil design for BC68 and M66 modules. 5.1. Recommended Compatible Footprint The following figure shows the bottom view of BC68 and M66. - Page 25 The circular test points with a radius of 1.4mm in the above recommended footprint should not be designed in schematic and PCB decal, and these test points should be served as a keepout area. The pin 52 of BC68 should not be designed in the recommended footprint for compatibility with M66 module.
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Page 26: Recommended Stencil Design
5.2. Recommended Stencil Design The thickness of PCB is different. In order to ensure the module soldering quality, the thickness of stencil is recommended to be 0.2mm for M66 and 0.18mm for BC68. For more details, please refer to document [5]. - Page 27 GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design The recommended stencil design for M66 is shown as below. Figure 18: Recommended Stencil Design for M66 (Unit: mm) BC68&M66_Compatible_Design 26 / 31...
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Page 28: Installation Sketch Map
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design 5.3. Installation Sketch Map The following figure shows the sketch map of installation for BC68 and M66. Figure 19: Installation Sketch Map for BC68/M66 BC68&M66_Compatible_Design 27 / 31... -
Page 29: Manufacturing And Packaging
GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design Manufacturing and Packaging 6.1. Soldering Push the squeegee to apply the solder paste on the surface of stencil, thus making the paste fill the stencil openings and then penetrate to the PCB. The force on the squeegee should be adjusted properly so as to produce a clean stencil surface on a single pass. -
Page 30: Packaging
The modules are stored inside a vacuum-sealed bag which is ESD protected. It should not be opened until the devices are ready to be soldered onto the application. 6.2.1. BC68 and M66 Packaging The reel is 330mm in diameter and each reel contains 250 modules. -
Page 31: Appendix A References
BC68&M66 Compatible Design Appendix A References Table 6: Related Documents Document Name Remark Quectel_M66_AT_Commands_Manual AT commands manual Quectel_BC95-G&BC68_AT_Commands_ AT Commands Manual for BC68 and Manual BC95-G Quectel_BC68_Hardware_Design BC68 Hardware Design Quectel_M66_Hardware_Design M66 Hardware Design Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide... - Page 32 GSM/GPRS/NB-IoT Module Series BC68&M66 Compatible Design Global System for Mobile Communications GPRS General Packet Radio Service Leadless Chip Carriers Low Dropout Regulator Light Emitting Diode Land Grid Array Long Term Evolution NB-IoT Narrow Band Internet of Things Printed Circuit Board...
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