Quectel BG77 Hardware Design Download Page 61 | Manualshive

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Quectel BG77 Hardware Design Download Page 61

LPWA Module Series

BG77 Hardware Design

BG77_Hardware_Design 57 / 76

Figure 28: Reference Circuit of GNSS Antenna Interface

1. An external LDO can be selected to supply power according to the active antenna requirement.
2. If the module is designed with a passive antenna, then the VDD circuit is not needed.

5.3. Antenna Installation

5.3.1. Antenna Requirements

The following table shows the requirements on main antenna and GNSS antenna.

Table 34: Antenna Requirements

Antenna Type

Requirements

GNSS

1)

Frequency range: 1559MHz ~1609MHz
Polarization: RHCP or linear
VSWR: < 2 (Typ.)
Passive antenna gain: > 0dBi
Active antenna noise figure: < 1.5dB
Active antenna gain: > 0dBi
Active antenna embedded LNA gain: < 17dB

LTE

VSWR:

≤

2

Efficiency: > 30%
Max Input Power (W): 50
Input Impedance (

Ω

): 50

NOTES

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Summary of Contents for BG77

Page 1: ...BG77 Hardware Design LPWA Module Series Rev BG77_Hardware_Design_V1 1 Date 2019 10 08 Status Preliminary www quectel com...

Page 2: ...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 INFORMATI...

Page 3: ...r supply in Table 3 3 Updated Pin Assignment in Figure 2 4 Updated Pin Description in Table 3 5 Added PON_TRIG pin to wake up the module from PSM in Chapter 3 4 2 6 Updated the power supply in Chapter...

Page 4: ...e 25 3 4 2 Power Saving Mode PSM 26 3 4 3 Extended Idle Mode DRX e I DRX 27 3 4 4 Sleep Mode 27 3 4 4 1 UART Application 27 3 5 Power Supply 28 3 5 1 Power Supply Pins 28 3 5 2 Decrease Voltage Drop 2...

Page 5: ...54 5 2 GNSS Antenna Interface 56 5 3 Antenna Installation 57 5 3 1 Antenna Requirements 57 5 3 2 Recommended RF Connector for Antenna Installation 58 6 Electrical Reliability and Radio Characteristic...

Page 6: ...ORKING STATE OF NETLIGHT 43 TABLE 19 PIN DEFINITION OF STATUS 44 TABLE 20 DEFAULT BEHAVIORS OF RI 45 TABLE 21 PIN DEFINITION OF USB_BOOT INTERFACE 46 TABLE 22 PIN DEFINITION OF ADC INTERFACES 47 TABLE...

Page 7: ...Module Series BG77 Hardware Design BG77_Hardware_Design 6 76 TABLE 42 RECOMMENDED THERMAL PROFILE PARAMETERS 71 TABLE 43 REEL PACKAGING 73 TABLE 44 RELATED DOCUMENTS 74 TABLE 45 TERMS AND ABBREVIATION...

Page 8: ...GURE 18 REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT 42 FIGURE 19 REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC 43 FIGURE 20 REFERENCE CIRCUIT OF THE NETWORK STATUS INDICATOR 44 FIGURE 21 REFEREN...

Page 9: ...LPWA Module Series BG77 Hardware Design BG77_Hardware_Design 8 76 FIGURE 39 REEL DIMENSIONS 73...

Page 10: ...pplications This document can help customers quickly understand the interface specifications electrical and mechanical details as well as other related information of BG77 To facilitate its applicatio...

Page 11: ...lt 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 rest...

Page 12: ...le device maintain at least a 20 cm separation between the EUT and the user s body and must not transmit simultaneously with any other antenna or transmitter 3 A label with the following statements mu...

Page 13: ...ting configurations including portable configurations with respect to 2 1093 and different antenna configurations For this device OEM integrators must be provided with labeling instructions of finishe...

Page 14: ...ional radiator shall caution the user that changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment In cases whe...

Page 15: ...nt With a compact profile of 14 9mm 12 9mm 1 7mm BG77 can meet almost all requirements for M2M applications such as smart metering tracking system security wireless POS etc It is especially suitable f...

Page 16: ...Protocol and CHAP Challenge Handshake Authentication Protocol protocols which are usually used for PPP connections SMS Text and PDU mode Point to point MO and MT SMS cell broadcast SMS storage ME by...

Page 17: ...ws a block diagram of BG77 and illustrates the major functional parts Power management Baseband Radio frequency Peripheral interfaces Used for software debugging and log output Support 115200bps baud...

Page 18: ...of the voltage drop inside the Qualcomm chipset Due to platform limitations the chipset has integrated the reset function into PWRKEY Therefore PWRKEY should never be pulled down to GND permanently 2...

Page 19: ...connected to customers cellular application platforms The following sub chapters will provide detailed description of interfaces listed below Power supply U SIM interface USB interface UART interface...

Page 20: ...ANT_GNSS 57 GPIO3 61 DBG_RXD 62 DTR 63 SPI_CS 78 STATUS 76 RI 87 USB_BOOT I2C SPI DCD 90 NETLIGHT 79 ADC1 18 10 USB_DM 11 USB_DP 12 USB_VBUS 4 13 USIM_CLK 14 USIM_DATA 15 USIM_RST 16 USIM_VDD 44 USIM...

Page 21: ...SPI_MOSI pin40 NETLIGHT pin79 and GPRC1 pin83 are BOOT_CONFIG pins They should not be pulled up before startup 3 2 Pin Description The following tables show the pin definition and description of BG77...

Page 22: ...PWRKEY should never be pulled down to GND permanently Reset Pin Name Pin No I O Description DC Characteristics Comment RESET_N 45 DI Reset the module Vnorm 1 5V VILmax 0 45V Status Indication Pin Name...

Page 23: ...6V VIHmin 1 2V VIHmax 2 0V 1 8V power domain If unused keep this pin open The pin function is under development USIM_VDD 16 PO Power supply for U SIM card Vmax 1 9V Vmin 1 7V Only 1 8V U SIM card is s...

Page 24: ...1 8V power domain If unused keep this pin open RI 76 DO Ring indication signal VOLmax 0 45V VOHmin 1 35V 1 8V power domain If unused keep this pin open Debug UART Interface Pin Name Pin No I O Descri...

Page 25: ...M data output VOLmax 0 45V VOHmin 1 35V 1 8V power domain If unused keep this pin open I2C Interface Pin Name Pin No I O Description DC Characteristics Comment I2C_SCL 37 OD I2C serial clock Used for...

Page 26: ...n GPIO Interfaces Pin Name Pin No I O Description DC Characteristics Comment GPIO1 1 IO General purpose input output interface VOLmax 0 45V VOHmin 1 35V VILmin 0 3V VILmax 0 6V VIHmin 1 2V VIHmax 2 0V...

Page 27: ...keep this pin open The pin function is under development AP_READY 77 DI Application processor sleep state detection VILmin 0 3V VILmax 0 6V VIHmin 1 2V VIHmax 2 0V 1 8V power domain If unused keep th...

Page 28: ...and GPIO functions are under development 6 SPI_MOSI pin40 NETLIGHT pin79 and GPRC1 pin83 are BOOT_CONFIG pins They should not be pulled up before startup 7 ADC input voltage must not exceed 1 8V 8 Ke...

Page 29: ...consumption while being available for mobile terminating data and or network originated procedures within a certain delay dependent on the DRX cycle value Airplane Mode AT CFUN 4 or W_DISABLE pin can...

Page 30: ...sumption The mode is similar to power off but the module remains registered on the network and there is no need to re attach or re establish PDN connections So BG77 in PSM cannot immediately respond u...

Page 31: ...he subscription data from the HSS may also provide different values of the e I DRX parameters than what was requested by the UE If the EPC accepts the use of e I DRX the UE applies e I DRX based on th...

Page 32: ...n be configured to high level or low level detection Please refer to AT QCFG apready command in document 2 for details AP_READY function is still under development 3 5 Power Supply 3 5 1 Power Supply...

Page 33: ...an external application has to be a single voltage source and can be expanded to two sub paths with star structure The width of VBAT trace should be no less than 1mm In principle the longer the VBAT t...

Page 34: ...control the PWRKEY A simple reference circuit is illustrated in the following figure Turn on pulse PWRKEY 4 7K 47K 500ms 1000ms 10nF Figure 5 Turn on the Module Using Driving Circuit Another way to c...

Page 35: ...SB NOTE Inactive Active UART Typ 2 1s Typ 2 55s Typ 2 5s Figure 7 Timing of Turning on Module 1 Make sure that VBAT is stable before pulling down PWRKEY pin and keep the interval no less than 30ms 2 P...

Page 36: ...e power down procedure after the PWRKEY is released The power off timing is illustrated in the following figure VBAT PWRKEY 1 3s 650ms 1500ms RUNNING Power down procedure OFF Module Status STATUS VIL...

Page 37: ...ng Module Status Running RESET_N VIL 0 45V Restart 3 8s Figure 9 Timing of Reset Module The recommended circuit is similar to the PWRKEY control circuit An open drain collector driver or button can be...

Page 38: ...PON_TRIG Interface BG77 provides one PON_TRIG pin which is used to wake up the module from PSM When the pin detects a rising edge the module will be woken up from PSM Table 9 Pin Definition of PON_TRI...

Page 39: ...000 requirements Table 10 Pin Definition of U SIM Interface Pin Name Pin No I O Description Comment USIM_DET 44 DI U SIM card insertion detection 1 8V power domain The pin function is under developmen...

Page 40: ...GND GND 33pF 33pF 33pF VCC RST CLK IO VPP GND GND USIM_VDD 15K Figure 13 Reference Circuit of U SIM Interface with an 8 Pin U SIM Card Connector If U SIM card detection function is not needed please k...

Page 41: ...tance not exceeding 15pF In order to facilitate debugging it is recommended to reserve series resistors for the U SIM signals of the module The 33pF capacitors are used for filtering interference of G...

Page 42: ...VOUT GND VBAT 1uF C1 R1 R2 0R 10K VDD_EXT EXT_PWR_EN 1uF C2 VDD_USB_3V3 U1 SGM2040 3 3 Figure 15 Reference Design of USB PHY USB_DP USB_DM GND USB_DP USB_DM GND L1 Close to Module R1 R2 Test Points ES...

Page 43: ...n inner layer with ground shielding on not only upper and lower layers but also right and left sides Pay attention to the influence of junction capacitance of ESD protection components on USB data lin...

Page 44: ...ces are described in the following table Pin Name Pin No I O Description Comment DTR 62 DI Data terminal ready Sleep mode control 1 8V power domain RXD 6 DI Receive data 1 8V power domain TXD 7 DO Tra...

Page 45: ...A6 A7 A8 GND B1 B2 B3 B4 B5 B6 B7 B8 VDD_EXT RI DCD RTS RXD DTR CTS TXD 51K 51K 0 1uF 0 1uF RI_MCU DCD_MCU RTS_MCU RXD_MCU DTR_MCU CTS_MCU TXD_MCU VDD_MCU Translator 10K 120K Figure 17 Reference Circ...

Page 46: ...following table shows the pin definition of the two interfaces which can be applied on audio codec design Table 16 Pin Definition of PCM and I2C Interfaces Pin Name Pin No I O Description Comment PCM_...

Page 47: ...s under development 3 13 Network Status Indication BG77 provides one network status indication pin NETLIGHT The pin is used to drive a network status indication LED The following tables describe the p...

Page 48: ...tion status of BG77 module It will output high level when the module is powered on The following table describes the pin definition of STATUS Table 19 Pin Definition of STATUS The following figure sho...

Page 49: ...ors of RI are shown as below Table 20 Default Behaviors of RI The default RI behaviors can be configured flexibly by AT QCFG urc ri ring command For more details about AT QCFG please refer to document...

Page 50: ...above circuit design during application design 3 17 ADC Interfaces The module provides two analog to digital converter ADC interfaces AT QADC 0 command can be used to read the voltage value on ADC0 p...

Page 51: ...d to use resistor divider circuit for ADC application and the divider resistor accuracy should be no less than 1 3 18 SPI Interface BG77 module provides one SPI interface which support master slave mo...

Page 52: ...GPIO pin s status For more details about the AT command please refer to document 2 Table 25 Pin Definition of GPIO Interfaces The following table describes the characteristics of GPIO interfaces Table...

Page 53: ...tion of GRFC Interfaces Table 28 Logic Levels of GRFC Interfaces 1 means under development 2 GRFC1 is a BOOT_CONFIG pin It should not be pulled up before startup VIL 0 3 0 6 V VIH 1 2 2 0 V VOL 0 0 45...

Page 54: ...e by default By default BG77 GNSS engine is switched off It has to be switched on via AT command For more details about GNSS engine technology and configurations please refer to document 3 4 2 GNSS Pe...

Page 55: ...cold start command 4 3 Layout Guidelines The following layout guidelines should be taken into account in customers designs Maximize the distance between GNSS antenna and main antenna Digital circuits...

Page 56: ...shown below Table 30 Pin Definition of Main Antenna Interface 5 1 2 Operating Frequency Table 31 BG77 Operating Frequency Pin Name Pin No I O Description Comment ANT_MAIN 26 IO Main antenna interface...

Page 57: ...performance and the type matching components R1 C1 C2 should be placed as close to the antenna as possible The capacitors are not mounted by default LTE FDD B13 777 787 746 756 MHz LTE FDD B14 1 788 7...

Page 58: ...RF traces is usually determined by the trace width W the materials dielectric constant the distance between signal layer and reference ground H and the clearance between RF trace and ground S Microstr...

Page 59: ...dware_Design 55 76 Figure 25 Coplanar Waveguide Line Design on a 2 layer PCB Figure 26 Coplanar Waveguide Line Design on a 4 layer PCB Layer 3 as Reference Ground Figure 27 Coplanar Waveguide Line Des...

Page 60: ...e reference ground of RF traces should be complete Meanwhile adding some ground vias around RF traces and the reference ground could help to improve RF performance The distance between the ground vias...

Page 61: ...circuit is not needed 5 3 Antenna Installation 5 3 1 Antenna Requirements The following table shows the requirements on main antenna and GNSS antenna Table 34 Antenna Requirements Antenna Type Requir...

Page 62: ...supported by Cat NB2 only 4 means under development 5 3 2 Recommended RF Connector for Antenna Installation If RF connector is used for antenna connection it is recommended to use the U FL R SMT conne...

Page 63: ...BG77_Hardware_Design 59 76 Figure 30 Mechanicals of U FL LP Connectors The following figure describes the space factor of mated connector Figure 31 Space Factor of Mated Connector Unit mm For more de...

Page 64: ...in the following table Table 35 Absolute Maximum Ratings 6 2 Power Supply Ratings Table 36 Power Supply Ratings Parameter Min Max Unit VBAT 0 5 6 0 V USB_VBUS 1 3 1 8 V Voltage at Digital Pins 0 3 2 0...

Page 65: ...ects on radio spectrum and no harm to radio network Only one or more parameters like Pout might reduce in their value and exceed the specified tolerances When the temperature returns to the normal ope...

Page 66: ...OFF LTE FDD B1 TBDdBm TBD TBD mA LTE FDD B2 TBDdBm TBD TBD mA LTE FDD B3 TBDdBm TBD TBD mA LTE FDD B4 TBDdBm TBD TBD mA LTE FDD B5 TBDdBm TBD TBD mA LTE FDD B8 TBDdBm TBD TBD mA LTE FDD B12 TBDdBm TBD...

Page 67: ...D TBD mA LTE FDD B3 TBDdBm TBD TBD mA LTE FDD B4 TBDdBm TBD TBD mA LTE FDD B5 TBDdBm TBD TBD mA LTE FDD B8 TBDdBm TBD TBD mA LTE FDD B12 TBDdBm TBD TBD mA LTE FDD B13 TBDdBm TBD TBD mA LTE FDD B18 TBD...

Page 68: ...Frequency Max Min LTE FDD B1 B2 B3 B4 B5 B8 B12 B13 B14 1 B18 B19 B20 B25 B26 B27 2 B28 B66 B71 B85 21dBm 1 3dB 39dBm Network Band Primary Diversity Sensitivity dBm Cat M1 3GPP Cat NB2 1 3GPP LTE LTE...

Page 69: ...d packaging procedures must be applied throughout the processing handling and operation of any application that incorporates the module The following table shows the electrostatic discharge characteri...

Page 70: ...ons This chapter describes the mechanical dimensions of the module All dimensions are measured in mm and the tolerances for dimensions without tolerance values are 0 05mm 7 1 Mechanical Dimensions of...

Page 71: ...ware Design BG77_Hardware_Design 67 76 12 90 0 15 14 90 0 15 11 90 13 90 1 00 6 45 7 45 7 45 6 45 1 30 0 65 1 15 4 15 0 65 0 85 0 85 1 30 1 00 1 95 5 30 6 45 0 65 R0 35 R0 35 Figure 33 Module Bottom D...

Page 72: ...1 30 0 65 1 15 0 65 0 85 0 85 1 30 1 00 1 95 0 65 R0 35 R0 35 6 45 4 15 5 30 Figure 34 Recommended Footprint Top View 1 For easy maintenance of the module please keep about 3mm between the module and...

Page 73: ...are_Design 69 76 7 3 Design Effect Drawings of the Module Figure 35 Top View of the Module Figure 36 Bottom View of the Module These are renderings of BG77 module For authentic appearance please refer...

Page 74: ...e factory environment of 30 C 60 RH Stored at 10 RH 3 Devices require baking before mounting if any circumstance below occurs When the ambient temperature is 23 C 5 C and the humidity indication card...

Page 75: ...the peak reflow temperature is 238 245 C and the absolute maximum reflow temperature is 245 C To avoid damage to the module caused by repeated heating it is strongly recommended that the module should...

Page 76: ...e bag should not be opened until the devices are ready to be soldered onto the application The following figures show the packaging details measured in mm Figure 38 Tape Dimensions Reflow Zone Max slo...

Page 77: ...A Module Series BG77 Hardware Design BG77_Hardware_Design 73 76 Figure 39 Reel Dimensions Table 43 Reel Packaging Model Name MOQ for MP Minimum Package 250pcs Minimum Package x 4 1000pcs BG77 TBD TBD...

Page 78: ...mands_Manual BG77 GNSS AT Commands Manual 4 Quectel_RF_Layout_Application_Note RF Layout Application Note 5 Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide Abbreviation Descrip...

Page 79: ...put Inorm Normal Current LED Light Emitting Diode LNA Low Noise Amplifier LTE Long Term Evolution MO Mobile Originated MS Mobile Station GSM engine MT Mobile Terminated PAP Password Authentication Pro...

Page 80: ...Maximum Input High Level Voltage Value VIHmin Minimum Input High Level Voltage Value VILmax Maximum Input Low Level Voltage Value VILmin Minimum Input Low Level Voltage Value VImax Absolute Maximum In...

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