Quectel EG915U-EU Manual Download

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LTE Standard Module Series

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7.3. Top and Bottom Views

Figure 38: Top & Bottom Views of the Module

These are renderings of the module. For authentic appearance, please refer to the module that you

receive from Quectel.

NOTE

Summary of Contents for EG915U-EU

Page 1: ...EG915U EU Hardware Design LTE Standard Module Series Version 1 0 0 Date 2021 06 24 Status Preliminary ...

Page 2: ... Disclaimer While Quectel has made efforts to ensure that the functions and features under development are free from errors it is possible that these functions and features could contain errors inaccuracies and omissions Unless otherwise provided by valid agreement Quectel makes no warranties of any kind implied or express with respect to the use of features and functions under development To the ...

Page 3: ...tions Co Ltd 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 Copyright Quectel Wireless Solutions Co Ltd 2021 All rights reserved ...

Page 4: ...se 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 signal and cellular network cannot be guaranteed to connect in certain conditions such as when the mobile bill is unpaid or the U SIM card is invalid When emergent help is nee...

Page 5: ...le Series EG915U EU_Hardware_Design 4 81 About the Document Revision History Version Date Author Description 2021 06 24 Kexiang ZHANG Len CHEN Creation of the document 1 0 0 2021 06 24 Kexiang ZHANG Len CHEN Preliminary ...

Page 6: ...cation with USB Remote Wakeup Function 28 3 2 2 2 USB Application with USB Suspend Resume and RI Function 29 3 3 Airplane Mode 29 3 4 Power Supply 30 3 4 1 Power Supply Pins 30 3 4 2 Reference Design for Power Supply 31 3 4 3 Requirements for Voltage Stability 31 3 5 Turn On 33 3 5 1 Turn on the Module with PWRKEY 33 3 6 Turn Off 34 3 6 1 Turn off the Module with PWRKEY 35 3 6 2 Turn off the Modul...

Page 7: ...Reference Design 56 5 1 5 GRFC Interfaces 57 5 2 Reference Design of RF Routing 58 5 3 Requirements for Antenna Design 60 5 4 RF Connector Recommendation 60 6 Electrical Characteristics Reliability 62 6 1 Absolute Maximum Ratings 62 6 2 Power Supply Ratings 63 6 3 Power Consumption 63 6 4 ESD 64 6 5 Operating and Storage Temperatures 65 7 Mechanical Information 66 7 1 Mechanical Dimensions 66 7 2 ...

Page 8: ...PI Interface 50 Table 20 Pin Definition of Control Signal 50 Table 21 Pin Definition of Indication Signal 51 Table 22 Working State of the Network Connection Status Activity Indication 51 Table 23 Behaviors of the MAIN_RI 53 Table 24 Pin Definition of Cellular Network Interface 54 Table 25 Operating Frequency of EG915U EU 54 Table 26 Tx Power 55 Table 27 Conducted RF Receiving Sensitivity of EG915...

Page 9: ...Figure 20 Reference Circuit of U SIM Interface with an 8 Pin U SIM Card Connector 44 Figure 21 Reference Circuit of a 6 Pin U SIM Card Connector 44 Figure 22 Reference Circuit of PCM Application with Audio Codec 46 Figure 23 Reference Circuit with Translator Chip 47 Figure 24 Reference Circuit with Transistor Circuit 48 Figure 25 Reference Circuit of the Network Status Indication 52 Figure 26 Refe...

Page 10: ...LTE Standard Module Series EG915U EU_Hardware_Design 9 81 Figure 42 Tape and Reel Directions 75 ...

Page 11: ...mation of the module Associated with application notes and user guides customers can use this module to design and to set up mobile applications easily 1 1 Special Mark Table 1 Special Mark Mark Definition Unless otherwise specified when an asterisk is used after a function feature interface pin name AT command or argument it indicates that the function feature interface pin AT command or argument...

Page 12: ...Dimensions 23 6 mm 19 9 mm 2 4 mm Weight TBD Wireless network functions LTE GSM Bluetooth Wi Fi Scan 1 The Bluetooth and Wi Fi Scan functions of the EG915U EU are integrated but the Bluetooth and Wi Fi Scan functions cannot be used at the same time and only one of them can be selected 2 EG915U EU supports Bluetooth and Wi Fi functions Because of common antenna interfaces two functions cannot be us...

Page 13: ... EG915U EU_Hardware_Design 12 81 2 1 Frequency Bands and Functions Table 3 Wireless Network Type 1 Optional Wireless Network Type EG915U EU LTE FDD B1 B3 B5 B7 B8 B20 B28 GSM 850 900 1800 1900 MHz Bluetooth Wi Fi Scan 1 2 4 GHz ...

Page 14: ...communication link with the peripheral devices One SPI interface only supports master mode 1 8 V operation voltage with clock rates up to 25 MHz I2C Interface One I2C interface Comply with I2C bus specification version USB Interface Compliant with USB 2 0 specification only slave with transmission rates up to 480 Mbps Used for AT command communication data transmission software debugging firmware ...

Page 15: ...face ANT_BT WIFI_SCAN 50 Ω impedance Transmitting Power GSM850 EGSM900 Class 4 33 dBm 2 dB DCS1800 PCS1900 Class 1 30 dBm 2 dB LTE FDD Class 3 23 dBm 2 dB DCS1800 Class 1 30 dBm 2 dB LTE Features Supports up to non CA Cat 1 FDD Supports 1 4 3 5 10 15 20 MHz RF bandwidth Supports uplink QPSK 16 QAM Supports downlink QPSK 16 QAM and 64 QAM FDD Max 10 Mbps DL 5 Mbps UL GSM Features GPRS Supports GPRS...

Page 16: ...tional parts Power management Baseband Radio frequency Peripheral interface Baseband PMIC Transceiver PA PAM ANT_MAIN VBAT_RF PWRKEY ADCs VDD_EXT 2x U SIM PCM UARTs I2C Control Duplex Tx PRx STATUS RESET_N SAW ANT_BT WIFI_SCAN 26 MHz DCXO SPI Nor Flash 64Mb PSRAM 128Mb MIC 32 kHz Clock USB SPI SPK Control VBAT_BB Figure 1 EG915U EU Functional Diagram 2 4 Pin Assignment ...

Page 17: ...DIN SPI_DOUT RESERVED RESERVED PSM_EINT I2S_CLK RESERVED GRFC1 GRFC2 103 104 103 115 114 103 118 113 2 112 111 103 106 105 107 116 103 108 117 109 110 RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED 119 126 120 121 122 123 124 125 MIC_N MIC_...

Page 18: ...OD Open Drain PI Power Input PO Power Output Power Supply Pin Name Pin No I O Description DC Characteristics Comment VBAT_BB 32 33 PI Power supply for the module s baseband part Vmax 4 3 V Vmin 3 3 V Vnom 3 8 V It must be provided with sufficient current up to 1 A VBAT_RF 52 53 PI Power supply for the module s RF part It must be provided with sufficient current up to 2 5 A VDD_EXT 29 PO Provide 1 ...

Page 19: ...teristics Comment STATUS 20 DO Indicate the module s operation status VOHmin 1 35 V VOLmax 0 45 V 1 8 V power domain If unused keep it open NET_STATUS 21 DO Indicate the module s network activity status VOHmin 1 35 V VOLmax 0 45 V 1 8 V power domain If unused keep it open PSM_IND 1 DO Indicate the module s power saving mode USB Interface Pin Name Pin No I O Description DC Characteristics Comment U...

Page 20: ...V or 3 0 V U SIM card is supported and can be identified automatically by the module USIM1_DATA 45 DIO U SIM1 card data For 1 8 V U SIM VILmax 0 6 V VIHmin 1 26 V VOLmax 0 45 V VOHmin 1 35 V For 3 0 V U SIM VILmax 1 0 V VIHmin 1 95 V VOLmax 0 45 V VOHmin 2 55 V USIM1_CLK 46 DO U SIM1 card clock For 1 8 V U SIM VOLmax 0 45 V VOHmin 1 35 V For 3 0 V U SIM VOLmax 0 45 V VOHmin 2 55 V USIM1_RST 44 DO ...

Page 21: ...Either 1 8 V or 3 0 V U SIM card is supported and can be identified automatically by the module USIM2_DATA 86 DIO U SIM2 card data 1 8 V U SIM VILmax 0 6 V VIHmin 1 26 V VOLmax 0 45 V VOHmin 1 35 V 3 0 V U SIM VILmax 1 0 V VIHmin 1 95 V VOLmax 0 45 V VOHmin 2 55 V USIM2_CLK 84 DO U SIM2 card clock 1 8 V U SIM VOLmax 0 45 V VOHmin 1 35 V 3 0 V U SIM VOLmax 0 45 V VOHmin 2 55 V USIM2_RST 85 DO U SIM...

Page 22: ..._TXD 35 DO Main UART transmit VOLmax 0 45 V VOHmin 1 35 V MAIN_RI 39 DO Main UART ring indication VOLmax 0 45 V VOHmin 1 35 V MAIN_DTR 30 DI Main UART data terminal ready VILmin 0 3 V VILmax 0 6 V VIHmin 1 26 V VIHmax 2 0 V AUX UART Interface Pin Name Pin No I O Description DC Characteristics comment AUX_TXD 27 DO Auxiliary UART transmit VOLmax 0 45 V VOHmin 1 35 V 1 8 V power domain If unused kee...

Page 23: ...c it cannot connect to other external devices I2C_SDA 41 OD I2C serial data for external codec I2S Interface Pin Name Pin No I O Description DC Characteristics Comment I2S_CLK 63 DO I2S clock If unused keep it open The function is under development we do not recommend customers to use it PCM Interface Pin Name Pin No I O Description DC Characteristics Comment PCM_SYNC 5 DI PCM data frame sync VILm...

Page 24: ...me Pin No I O Description DC Characteristics Comment GRFC1 76 DO Generic RF Controller If unused keep this pin open GRFC2 77 DO SPI Interface Pin Name Pin No I O Description DC Characteristics Comment SPI_CLK 26 DO SPI clock VOLmax 0 45 V VOHmin 1 35 V Just master mode only SPI_CS 25 DO SPI chip select VOLmax 0 45 V VOHmin 1 35 V SPI_DIN 88 DI SPI master mode input VILmin 0 3 V VILmax 0 6 V VIHmin...

Page 25: ... When it is in low voltage level the module can enter airplane mode If unused keep it open AP_READY 19 DI Application processor ready VILmin 0 3 V VILmax 0 6 V VIHmin 1 26 V VIHmax 2 0 V 1 8 V power domain If unused keep it open Analog Audio Interfaces Pin Name Pin No I O Description DC Characteristics Comment MIC_N 119 AI Microphone analog input MICBIAS 120 PO Bias voltage output for microphone V...

Page 26: ...ctel supplies an evaluation board UMTS LTE EVB USB data cable earphone antenna and other peripherals to control or to test the module For more details please refer to document 1 RESERVED Interfaces Pin Name Pin No RESERVED 11 12 13 14 16 49 51 57 65 66 78 92 93 94 95 97 98 99 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 123 124 125 ...

Page 27: ... network setting and data transfer rate Minimum Functionality Mode AT CFUN 0 command can set the module to a minimum functionality mode In this case both RF function and U SIM card will be invalid Airplane Mode AT CFUN 4 command or W_DISABLE pin can set the module to airplane mode In this case RF function will be invalid Sleep Mode In this mode current consumption of the module will be reduced to ...

Page 28: ... MAIN DTR to a high level The figure illustrates the connection between the module and the host MAIN_RXD MAIN_TXD MAIN_RI MAIN_DTR AP_READY TXD RXD EINT GPIO GPIO Module Host GND GND Figure 3 Sleep Mode Application via UART Driving the host DTR low will wake up the module When the module has a URC to report the URC will trigger the behavior of MAIN_RI pin 3 2 2 USB Application Scenario For the two...

Page 29: ...ion between the module and the host USB_VBUS USB_DP USB_DM AP_READY VDD USB_DP USB_DM GPIO Module Host GND GND Figure 4 Sleep Mode Application with USB Remote Wakeup Sending data to the module through USB will wake up the module When the module has a URC to report the module will send remote wake up signals to USB Bus to wake up the host Under Linux OS USB support Suspend under Windows OS nonsuppo...

Page 30: ...cation with RI Sending data to the module through USB will wake up the module When the module has a URC to report RI signal will wake up the host 3 3 Airplane Mode When the module enters into airplane mode the RF function will be disabled and all AT commands related to it will be inaccessible This mode can be set via the following ways Hardware The W_DISABLE pin is pulled up by default Its control...

Page 31: ...pins are used to connect an external power supply power to the RF and BB circuits of the module The following table shows the details of power supply and GND pins Two VBAT_RF pins for RF part Two VBAT_BB pins for BB part Table 8 Pin Definition of Power Supply Pin Name Pin No I O Description Comment VBAT_BB 32 33 PI Power supply for the module s baseband part VBAT_RF 52 53 PI Power supply for the m...

Page 32: ... the maximum load current is 3 0 A DC_IN MIC29302WU IN OUT EN GND ADJ 2 4 1 3 5 VBAT 100K 47K 470R 51K 1 4 7K 47K VBAT_EN 470 μF 470 μF 100 nF 100 nF 1 Figure 6 Reference Design of Power Supply 3 4 3 Requirements for Voltage Stability The power supply range of the module is from 3 3 V to 4 3 V Please make sure the input voltage will never drop below 3 3 V VBAT Burst Transmission Ripple Drop Burst ...

Page 33: ... the VBAT trace is the wider it will be In addition in order to ensure the stability of power source it is suggested that a TVS diode of which reverse stand off voltage is 4 7 V and peak pulse power is up to 2550 W should be used The following figure shows the reference circuit with and without charging function Module VBAT_RF VBAT_BB VBAT C1 100 µF C6 100 nF C7 33 pF C8 10 pF C2 100 nF C5 100µ F ...

Page 34: ... control the PWRKEY PWRKEY 4 7K 47K Turn on pulse 2 s 10 nF Figure 9 Reference Circuit of Turing on the Module with Driving Circuit Another way to control the PWRKEY is by using a button directly When pressing the button an electrostatic strike may generate from finger Therefore a TVS component shall be placed near the button for ESD protection PWRKEY S1 Close to S1 TVS Figure 10 Reference Circuit...

Page 35: ...ng 3 6 Turn Off The following procedures can be used to turn off the module Using the PWRKEY pin Using AT QPOWD command 1 Make sure that the VBAT is stable before pulling down PWRKEY pin It is recommended that the time difference between powering up VBAT and pulling down PWRKEY pin is no less than 30 ms 2 PWRKEY can be pulled down directly to GND with a recommended 1 kΩ resistor if module needs to...

Page 36: ...D command 1 To avoid damaging internal flash do not switch off the power supply when the module works normally Only after shutting down the module with PWRKEY or AT command can you cut off the power supply 2 When keeping the PWRKEY to the ground and the AT command cannot be used to turn off the module can only be forced to turn off by cutting off the VBAT power supply Therefore we recommend that y...

Page 37: ...rround it with ground Table 10 Pin Definition of RESET The recommended circuit is equal to the PWRKEY control circuit An open drain collector driver or button can be used to control the RESET_N Reset pulse RESET_N 4 7K 47K 100 ms Figure 13 Reference Circuit of RESET_N with Driving Circuit RESET_N S2 Close to S2 TVS Figure 14 Reference Circuit of RESET_N with Button Pin Name Pin No I O Description ...

Page 38: ...SET_N Baseband restart Baseband resetting 100 ms Figure 15 Reset Timing 1 Please ensure that there is no large capacitance with the max value exceeding 10 nF on PWRKEY and RESET_N pins 2 It is recommended to use RESET_N only when failing to turn off the module by AT QPOWD command or PWRKEY pin NOTE ...

Page 39: ...ence at DCS1800 Please note that the resonant frequency point of a capacitor largely depends on the material and production technique Therefore customers would have to discuss with their capacitor vendors to choose the most suitable capacitor for filtering out high frequency noises The filter capacitors on the PCB board should be placed as close to the audio devices or audio interfaces as possible...

Page 40: ...crophone channel reference circuit is shown in the following figure MIC_P Differential layout Module 10 pF 33 pF 33 pF 33 pF Electret Microphone 10 pF 10 pF TVS TVS Close to Module MIC_N MIC_BIAS Close to Microphone 2 2uF 100nF 1K 0R 0R 100nF 1K 510R 510R 1 5K 1 5K Figure 16 Reference Design for Microphone Interface MIC channel is sensitive to ESD so it is not recommended to remove the ESD compone...

Page 41: ...terface EG915U EU provides one integrated Universal Serial Bus USB interface which complies with the USB 2 0 specification and supports full speed 12 Mbps and high speed 480 Mbps modes The USB interface can only serve as a slave device and is used for AT command communication data transmission software debugging and firmware upgrade Table 12 Functions of the USB Interface Functions Data communicat...

Page 42: ...ence Circuit of USB Application A common mode choke L1 is recommended to be added in series between the module and customer s MCU in order to suppress EMI spurious transmission Meanwhile the 0 Ω resistors R3 and R4 should be added in series between the module and the test points so as to facilitate debugging and the resistors are not mounted by default In order to ensure the integrity of USB data ...

Page 43: ...election of the ESD component on the USB data line Its parasitic capacitance should not exceed 2 pF and should be placed as close as possible to the USB interface For more details about the USB specifications please visit http www usb org home 4 3 USB_BOOT Interface The module provides a USB_BOOT pin You can pull up USB_BOOT to VDD_EXT before powering up and the module will enter download mode whe...

Page 44: ...about the command Pin Name Pin No I O Description Comment USIM1_VDD 43 PO U SIM1 card power supply Either 1 8 V or 3 0 V U SIM card is supported and can be identified automatically by the module USIM1_DATA 45 DIO U SIM1 card data USIM1_CLK 46 DO U SIM1 card clock USIM1_RST 44 DO U SIM1 card reset USIM1_DET 42 DI U SIM1 card hot plug detect 1 8 V power domain If unused keep this pin open USIM1_GND ...

Page 45: ...ector is illustrated in the following figure Module USIM_VDD GND USIM_RST USIM_CLK USIM_DATA 0R 0R 0R 100 nF GND 33 pF 33 pF 33 pF VCC RST CLK IO VPP GND GND 15K USIM_VDD U SIM Card Connector Figure 21 Reference Circuit of a 6 Pin U SIM Card Connector In order to enhance the reliability and availability of the U SIM card in applications please follow the criteria below in U SIM circuit design Keep...

Page 46: ...esistor near the U SIM card connector USIM2 is under development not recommended for the time being For details please contact the technical support of remote communication 4 5 I2C and PCM Interfaces EG915U EU provides one I2C interface and one Pulse Code Modulation PCM interface The PCM interface of EG91U EU series only supports slave mode not master mode Therefore an external clock must to be pr...

Page 47: ...UART interface supports 4800 bps 9600 bps 19200 bps 38400 bps 57600 bps 115200 bps 230400 bps 460800 bps and 921600 bps baud rates and the default is 115200 bps This interface is used for data transmission and AT command communication The debug UART interface supports 921600 bps baud rate It is used for the output of partial logs Auxiliary UART The following tables show the pin definition of main ...

Page 48: ...nect the MCU CTS pin Connect the MCU RTS pin Connect the MCU RXD pin Connect the MCU TXD pin Figure 23 Reference Circuit with Translator Chip Please visit http www ti com for more information Another example with transistor translation circuit is shown as below For the design of circuits in dotted lines please refer to that of the circuits in solid lines but please pay attention to the direction o...

Page 49: ...S CTS GND GPIO MAIN_DCD Module GPIO EINT VDD_EXT 4 7K GND 1 nF 1 nF Figure 24 Reference Circuit with Transistor Circuit 1 Transistor circuit solution is not suitable for applications with baud rates exceeding 460 kbps 2 Module s CTS connect to MCU s CTS module s RTS connect to MCU s RTS In addition pay attention to UART s CTS and RTS input and output directions NOTE ...

Page 50: ...ble 17 Pin Definition of ADC Interface Table 18 Characteristics of ADC Interface Pin Name Pin No I O Description Comment ADC0 24 AI General purpose ADC interface 1 kΩ resistor must be connected in series when using ADC1 2 AI Name Min Typ Max Unit ADC0 Voltage Range 0 VBAT V ADC1 Voltage Range 0 VBAT V ADC Resolution 12 bits 1 The input voltage of ADC should not exceed its corresponding voltage ran...

Page 51: ...l Pin Name Pin No I O Description Comment SPI_CLK 26 DO SPI clock Just master mode only SPI_CS 25 DO SPI chip select SPI_DIN 88 DI SPI master mode input SPI_DOUT 64 DO SPI master mode output When the universal 4 wire SPI interface is used to connect Nor Flash it supports Flash basic reading writing erasing etc It needs to perform erasing and writing balanced protection by itself It does not suppor...

Page 52: ...al 4 10 1 Network Status Indication The network indication pins can be used to drive network status indication LEDs The module provides two network indication pins NET_MODE and NET_STATUS The following tables describe pin definition and logic level changes in different network status Table 22 Working State of the Network Connection Status Activity Indication Pin Name Pin No I O Description Comment...

Page 53: ...g the module s operation status It will output high level when module is powered ON successfully A reference circuit is shown as below 4 7K 47K VBAT 2 2K Module STATUS Figure 26 Reference Circuits of STATUS Always Low Others NET_STATUS Flicker slowly 200 ms High 1800 ms Low Network searching Flicker slowly 1800 ms High 200 ms Low Idle Flicker quickly 125 ms High 125 ms Low Data transfer is ongoing...

Page 54: ... can be configured flexibly The default behavior of the MAIN_RI is shown as below Table 23 Behaviors of the MAIN_RI The MAIN_RI behavior can be changed via AT QCFG urc ri ring Please refer to document 2 for details The URC can be outputted via UART port USB AT port and USB modem port which can be set by AT QURCCFG command The default port is USB AT port State Response Idle MAIN_RI keeps at high le...

Page 55: ...le 25 Operating Frequency of EG915U EU Pin Name Pin No I O Description Comment ANT_MAIN 60 AIO Main antenna interface 50 Ω impedance ANT_BT WIFI_SCAN 56 AI Wi Fi Bluetooth antenna interface Only passive antennas are supported Operating Frequency Transmit MHz Receive MHz GSM850 824 849 869 894 PCS1900 1850 1910 1930 1990 EGSM900 880 915 925 960 DCS1800 1710 1785 1805 1880 LTE B1 1920 1980 2110 2170...

Page 56: ...B7 2500 2570 2620 2690 LTE B8 880 915 925 960 LTE B20 832 862 791 821 LTE B28 703 748 758 803 Frequency Max RF Output Power Min RF Output Power GSM850 EGSM900 33 dBm 2 dB 5 dBm 5 dB DCS1800 PCS1900 30 dBm 2 dB 0 dBm 5 dB LTE FDD B1 B3 B5 B7 B8 B20 B28 23 dBm 2 dB 39 dBm In GPRS 4 slots Tx mode the maximum output power is reduced by 6 dB The design conforms to the GSM specification as described in ...

Page 57: ...laced as close to the antenna as possible The capacitors are not mounted by default ANT_MAIN R1 0 R C1 Module Main antenna NM C2 NM R2 0 R C3 NM C4 NM ANT_BT WIFI SACN Figure 27 Reference Circuit for RF Antenna Interfaces EGSM900 TBD 102 dBm DCS1800 TBD 102 dBm PCS1900 TBD 102 dBm LTE FDD B1 10 MHz TBD 96 3 dBm LTE FDD B3 10 MHz TBD 96 3 dBm LTE FDD B5 10 MHz TBD 94 3 dBm LTE FDD B7 10 MHz TBD 94 ...

Page 58: ... of GRFC Interfaces Table 29 Logic Levels of GRFC Interfaces Table 30 Truth Table of GRFC Interfaces Pin Name Pin No I O Description Comment GRFC1 76 DO Generic RF Controller 1 8 V power domain If unused keep this pin open GRFC2 77 DO Parameter Min Max Unit VOL 0 0 45 V VOH 1 35 1 8 V GRFC1 Level GRFC2 Level Frequency Range MHz Band Low Low TBD TBD Low High TBD TBD High Low TBD TBD High High TBD T...

Page 59: ...race width W the materials dielectric constant height from the reference ground to the signal layer H and the space between RF traces and grounds S Microstrip or coplanar waveguide is typically used in RF layout to control characteristic impedance The following are reference designs of microstrip or coplanar waveguide with different PCB structures Figure 28 Microstrip Design on a 2 layer PCB Figur...

Page 60: ... adjacent to RF pins should not be designed as thermal relief pads and should be fully connected to ground The distance between the RF pins and the RF connector should be as short as possible and all the right angle traces should be changed to curved ones There should be clearance under the signal pin of the antenna connector or solder joint The reference ground of RF traces should be complete Mea...

Page 61: ... use U FL R SMT connector provided by Hirose Figure 32 Dimensions of U FL R SMT Connector Unit mm U FL LP serial connectors listed in the following figure can be used to match the U FL R SMT Antenna Type Requirements GSM EVDO CDMA UMTS TD SCDMA LTE VSWR 2 Efficiency 30 Max input power 50 W Input impedance 50 Ω Polarization Vertical Cable insertion loss 1 dB 1 GHz Cable insertion loss 1 5 dB 1 2 3 ...

Page 62: ...U EU_Hardware_Design 61 81 Figure 33 Mechanicals of U FL LP Connectors The following figure describes the space factor of mated connector Figure 34 Space Factor of Mated Connector Unit mm For more details please visit http hirose com ...

Page 63: ... for power supply and voltage on digital and analog pins of the module are listed in the following table Table 32 Absolute Maximum Ratings Parameter Min Max Unit VBAT_RF VBAT_BB 0 3 6 0 V USB_VBUS 0 3 5 5 V Peak Current of VBAT_BB 0 TBD A Peak Current of VBAT_RF 0 TBD A Voltage on Digital Pins 0 3 2 3 V Voltage at ADC0 0 VBAT V Voltage at ADC1 0 VBAT V ...

Page 64: ...l input voltages must stay between the minimum and maximum values 3 3 3 8 4 3 V Voltage drop during transmitting burst Maximum power control level at EGSM 900 400 mV Voltage drop during peak data rate TBD mV IVBAT Peak supply current during transmission slot Maximum power control level at EGSM 900 TBD TBD A USB_VBUS USB connection detection 3 5 5 0 5 25 V EG915U EU Description Conditions Typ Unit ...

Page 65: ...circuit design and the points that are vulnerable to electrostatic discharge damage or influence anti static gloves should be worn during production etc ESD characteristics of the module s pins are as follows Table 36 Electrostatics Discharge Characteristics 25 C 45 Relative Humidity LTE data transfer GNSS OFF TBD TBD mA GPRS data transfer TBD TBD mA LTE data transfer TBD TBD mA GSM voice call TBD...

Page 66: ...ain functions of the module such as voice SMS data transmission to be realized Only one or more parameters like Pout might reduce in their value and exceed the specified tolerances When the temperature returns to normal operating temperature levels the module will meet 3GPP specifications again VBAT GND TBD TBD kV All Antenna Interfaces TBD TBD kV Other Interfaces 0 5 1 kV Parameter Min Typ Max Un...

Page 67: ...ical Information This chapter describes the mechanical dimensions of the module All dimensions are measured in millimeter mm and the dimensional tolerances are 0 2 mm unless otherwise specified 7 1 Mechanical Dimensions Figure 35 Module Top and Side Dimensions Unit mm ...

Page 68: ...LTE Standard Module Series EG915U EU_Hardware_Design 67 81 Figure 36 Module Bottom Dimensions The package warpage level of the module conforms to the JEITA ED 7306 standard NOTE ...

Page 69: ...es EG915U EU_Hardware_Design 68 81 7 2 Recommended Footprint Figure 37 Recommended Footprint TOP View For convenient maintenance of the module please keep about 3 mm between the module and other components on the host PCB NOTE ...

Page 70: ...ries EG915U EU_Hardware_Design 69 81 7 3 Top and Bottom Views Figure 38 Top Bottom Views of the Module These are renderings of the module For authentic appearance please refer to the module that you receive from Quectel NOTE ...

Page 71: ...r other high temperature operations within 24 hours Otherwise the module should be stored in an environment where the relative humidity is less than 10 e g a drying cabinet 4 The module should be pre baked to avoid blistering cracks and inner layer separation in PCB under the following circumstances The module is not stored in Recommended Storage Condition Violation of the third requirement above ...

Page 72: ...e is over 60 it is recommended to start the solder reflow process within 24 hours after the package is removed And do not remove the packages of tremendous modules if they are not ready for soldering 2 Take the module out of the packaging and put it on high temperature resistant fixtures before baking If shorter baking time is desired see IPC JEDEC J STD 033 for the baking procedure 3 Pay attentio...

Page 73: ...eak reflow temperature is 238 246 C and the absolute maximum reflow temperature is 246 C To avoid damage to the module caused by repeated heating it is strongly recommended that the module should be mounted after reflow soldering for the other side of PCB has been completed The recommended reflow soldering thermal profile lead free reflow soldering and related parameters are shown below Temp C Ref...

Page 74: ...l information on the shielding can is still clearly identifiable and the QR code is still readable although white rust may be found 3 If a conformal coating is necessary for the module do NOT use any coating material that may chemically react with the PCB or shielding cover and prevent the coating material from flowing into the module 8 3 Packaging Specifications The module is packaged in tape and...

Page 75: ...LTE Standard Module Series EG915U EU_Hardware_Design 74 81 Figure 40 Tape Specifications Figure 41 Reel Specifications ...

Page 76: ...LTE Standard Module Series EG915U EU_Hardware_Design 75 81 Figure 42 Tape and Reel Directions ...

Page 77: ...ds_Manual 3 Quectel_RF_Layout_Application_Note 4 Quectel_Module_SMT_User_Guide Abbreviation Description ADC Analog to Digital Converter AMR WB Adaptive Multi Rate Wideband AON Active Optical Network AP Application Processor bps Bits Per Second BPSK Binary Phase Shift Keying BW Bandwidth CA Carrier Aggregation CHAP Challenge Handshake Authentication Protocol CS Coding Scheme CSD Circuit Switched Da...

Page 78: ...tinuous Reception DRX Diversity Receive DTE Data Terminal Equipment DTR Data Terminal Ready EFR Enhanced Full Rate ESD Electrostatic Discharge FDD Frequency Division Duplex FEM Front End Module FR Full Rate GLONASS Global Navigation Satellite System Russia GMSK Gaussian Minimum Shift Keying GNSS Global Navigation Satellite System GPS Global Positioning System GRFC General RF Control HB High Band H...

Page 79: ...mal Current LAA License Assisted Access LB Low Band LED Light Emitting Diode LGA Land Grid Array LMHB Low Middle High Band LNA Low Noise Amplifier LTE Long Term Evolution MAC Media Access Control MB Middle Band MCU Microcontroller Unit MDC Management Data Clock MDIO Management Data Input Output MHB Middle High Band MIMO Multiple Input Multiple Output MO Mobile Originated MS Mobile Station MT Mobil...

Page 80: ...ital Assistant PDU Protocol Data Unit PHY Physical Layer PMIC Power Management Integrated Circuit PRX Primary Receive QAM Quadrature Amplitude Modulation QPSK Quadrature Phase Shift Keying QZSS Quasi Zenith Satellite System RI Ring Indicator RF Radio Frequency RGMII Reduced Gigabit Media Independent Interface RHCP Right Hand Circularly Polarized Rx Receive SA Stand Alone SCS Sub Carrier Space SD S...

Page 81: ...hronous Receiver Transmitter UHB Ultra High Band UL Uplink UMTS Universal Mobile Telecommunications System URC Unsolicited Result Code USB Universal Serial Bus U SIM Universal Subscriber Identity Module VBAT Voltage at Battery Pin Vmax Maximum Voltage Value Vnom Nominal Voltage Value Vmin Minimum Voltage Value VIHmax Maximum Input High Level Voltage Value VIHmin Minimum Input High Level Voltage Va...

Page 82: ...um Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value VSWR Voltage Standing Wave Ratio WCDMA Wideband Code Division Multiple Access WLAN Wireless Local Area Network WWAN Wireless Wide Area Network ...

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