Huawei Technologies 201705EM300 eM300-8a User Manual

Huawei Technologies Co.,Ltd eM300-8a

User manual

eM300-8a Hardware Design eLTE-IoT Module Series Rev. eM300-8a_Hardware_Design_V1.0 Date: 2017-03-17 www.quectel.com
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 1 / 46 Our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarters: Quectel Wireless Solutions Co., Ltd. Office 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233 Tel: +86 21 5108 6236 Email: info@quectel.com Or our local office. For more information, please visit: http://www.quectel.com/support/salesupport.aspx For technical support, or to report documentation errors, please visit: http://www.quectel.com/support/techsupport.aspx Or email to: Support@quectel.com GENERAL NOTES 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. ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE. COPYRIGHT THE INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF QUECTEL CO., LTD. TRANSMITTING, REPRODUCTION, DISSEMINATION AND EDITING OF THIS DOCUMENT AS WELL AS UTILIZATION OF THE CONTENT ARE FORBIDDEN WITHOUT PERMISSION. 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. 2017. All rights reserved.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 2 / 46 About the Document History Revision Date Author Description 1.0 2017-03-17 Bryant CHEN/ Mark ZHANG Initial
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 3 / 46 Contents About the Document ................................................................................................................................... 2 Contents ....................................................................................................................................................... 3 Table Index ................................................................................................................................................... 5 Figure Index ................................................................................................................................................. 6 1 Introduction .......................................................................................................................................... 7 1.1. Safety Information ................................................................................................................... 8 1.2. FCC statement ........................................................................................................................ 9 1.2.1. FCC Regulations: ............................................................................................................. 9 1.2.2. RF Exposure Information ................................................................................................. 9 1.2.3. IMPORTANT NOTE: ........................................................................................................ 9 1.2.4. USERS MANUAL OF THE END PRODUCT: .................................................................. 9 1.2.5. LABEL OF THE END PRODUCT: .................................................................................. 10 2 Product Concept ................................................................................................................................ 11 2.1. General Description ............................................................................................................... 11 2.2. Key Features ......................................................................................................................... 12 2.3. Functional Diagram ............................................................................................................... 13 2.4. Evaluation Board ................................................................................................................... 13 3 Application Functions ....................................................................................................................... 14 3.1. General Description ............................................................................................................... 14 3.2. Pin Assignment ...................................................................................................................... 15 3.3. Pin Description ...................................................................................................................... 16 3.4. Operating Modes ................................................................................................................... 19 3.5. Power Supply ........................................................................................................................ 20 3.5.1. Power Supply Pins ......................................................................................................... 20 3.5.2. Reference Design for Power Supply .............................................................................. 20 3.6. Power on and down Scenarios ............................................................................................. 21 3.6.1. Power on ........................................................................................................................ 21 3.6.2. Power down.................................................................................................................... 22 3.6.3. Reset the Module ........................................................................................................... 22 3.7. SWD Interface ....................................................................................................................... 23 3.8. UART Interfaces .................................................................................................................... 24 3.8.1. Main Port ........................................................................................................................ 25 3.8.2. Debug Port ..................................................................................................................... 26 3.8.3. The UART Application .................................................................................................... 26 3.9. ADC Interface* ....................................................................................................................... 27 3.10. GPIO Interface ....................................................................................................................... 28 3.11. Behaviors of the RI* .............................................................................................................. 29 3.12. Network Status Indication* .................................................................................................... 29
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 4 / 46 4 Antenna Interface ............................................................................................................................... 31 4.1. RF Reference Design ............................................................................................................ 31 4.2. Reference Design of RF Layout ............................................................................................ 32 4.3. RF Receiving Sensitivity ........................................................................................................ 34 4.4. Antenna Requirement ........................................................................................................... 34 4.5. RF Cable Welding ................................................................................................................. 35 5 Electrical, Reliability and Radio Characteristics ............................................................................ 36 5.1. Absolute Maximum Ratings................................................................................................... 36 5.2. Operating Temperature ......................................................................................................... 37 5.3. Current Consumption ............................................................................................................ 37 6 Mechanical Dimensions .................................................................................................................... 38 6.1. Mechanical Dimensions of the Module ................................................................................. 38 6.2. Recommended Footprint ....................................................................................................... 40 7 Storage, Manufacturing and Packaging .......................................................................................... 41 7.1. Storage .................................................................................................................................. 41 7.2. Manufacturing and Soldering ................................................................................................ 42 7.3. Packaging .............................................................................................................................. 43 7.3.1. Tape and Reel Packaging .............................................................................................. 43 8 Appendix A Reference ....................................................................................................................... 45
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 5 / 46 Table Index TABLE 1: FREQUENCY BANDS OF EM300-8A MODULE ............................................................................... 11 TABLE 2: EM300-8A KEY FEATURES .............................................................................................................. 12 TABLE 3: I/O PARAMETERS DEFINITION ....................................................................................................... 16 TABLE 4: PIN DESCRIPTION ........................................................................................................................... 16 TABLE 5: OVERVIEW OF OPERATING MODES ............................................................................................. 19 TABLE 6: VBAT, VDD_EXT AND GND PINS .................................................................................................... 20 TABLE 7: RESET CHARACTERISTICS ........................................................................................................... 22 TABLE 8: PIN DEFINITION OF SWD INTERFACES ........................................................................................ 23 TABLE 9: PIN DEFINITION OF THE UART INTERFACES .............................................................................. 24 TABLE 10: LOGIC LEVELS OF THE UART INTERFACES .............................................................................. 25 TABLE 11: PIN DEFINITION OF THE ADC ....................................................................................................... 28 TABLE 12: PIN DEFINITION OF THE GPIO INTERFACE ............................................................................... 28 TABLE 13: BEHAVIORS OF THE RI ................................................................................................................. 29 TABLE 14: WORKING STATE OF THE NETLIGHT .......................................................................................... 29 TABLE 15: PIN DEFINITION OF THE RF_ANT ................................................................................................ 31 TABLE 16: RF RECEIVING SENSITIVITY (MCS-1, BLER <10%) ................................................................... 34 TABLE 17: ANTENNA CABLE REQUIREMENT ............................................................................................... 34 TABLE 18: ANTENNA REQUIREMENTS .......................................................................................................... 34 TABLE 19: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 36 TABLE 20: OPERATING TEMPERATURE ........................................................................................................ 37 TABLE 21: CURRENT CONSUMPTION ........................................................................................................... 37 TABLE 22: RELATED DOCUMENTS ................................................................................................................ 45 TABLE 23: TERMS AND ABBREVIATIONS ...................................................................................................... 45
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 6 / 46 Figure Index FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 13 FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 15 FIGURE 3: REFERENCE CIRCUIT FOR THE VBAT AND VDD_EXT INPUT ................................................. 21 FIGURE 4: TURN-ON TIMING .......................................................................................................................... 21 FIGURE 5: TURN-OFF TIMING ........................................................................................................................ 22 FIGURE 6: REFERENCE CIRCUIT OF RESET BY USING DRIVING CIRCUIT ............................................. 23 FIGURE 7: REFERENCE CIRCUIT OF RESET BY USING BUTTON ............................................................. 23 FIGURE 8: REFERENCE DESIGN FOR SWD INTERFACE............................................................................ 24 FIGURE 9: REFERENCE DESIGN FOR MAIN PORT ..................................................................................... 25 FIGURE 10: REFERENCE DESIGN FOR DEBUG PORT ............................................................................... 26 FIGURE 11: LEVEL MATCH DESIGN FOR 3.3V SYSTEM .............................................................................. 26 FIGURE 12: SKETCH MAP FOR RS-232 INTERFACE MATCH ...................................................................... 27 FIGURE 13: BEHAVIORS OF RI WHEN A URC OR SMS IS RECEIVED ....................................................... 29 FIGURE 14: REFERENCE DESIGN FOR NETLIGHT ..................................................................................... 30 FIGURE 15: REFERENCE DESIGN FOR RF .................................................................................................. 31 FIGURE 16: MICROSTRIP LINE DESIGN ON A 2-LAYER PCB ...................................................................... 32 FIGURE 17: COPLANAR WAVEGUIDE LINE DESIGN ON A 2-LAYER PCB .................................................. 32 FIGURE 18: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 3 AS REFERENCE GROUND) .................................................................................................................................................. 33 FIGURE 19: COPLANAR WAVEGUIDE LINE DESIGN ON A 4-LAYER PCB (LAYER 4 AS REFERENCE GROUND) .................................................................................................................................................. 33 FIGURE 20: RECOMMENDED RF CABLE WELDING .................................................................................... 35 FIGURE 21: TOP AND SIDE DIMENSIONS OF EM300-8A MODULE (UNIT: MM) ......................................... 38 FIGURE 22: BOTTOM DIMENSIONS OF EM300-8A MODULE (UNIT: MM) ................................................... 39 FIGURE 23: RECOMMENDED FOOTPRINT (UNIT: MM) ................................................................................ 40 FIGURE 26: REFLOW SOLDERING THERMAL PROFILE .............................................................................. 42 FIGURE 27: TAPE DIMENSIONS ..................................................................................................................... 43 FIGURE 28: REEL DIMENSIONS ..................................................................................................................... 44
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 7 / 46 1 Introduction This document defines the eM300-8a module and describes its hardware interface which are connected with your application and the air interface. This document can help you quickly understand module interface specifications, electrical and mechanical details. Associated with application note and user guide, you can use eM300-8a module to design and set up mobile applications easily.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 8 / 46 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 eM300-8a 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 the customer‟s 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. You must comply with laws and regulations restricting the use of wireless devices while driving. Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is switched off. The operation of wireless appliances in an aircraft is forbidden, so as to prevent interference with communication systems. Consult the airline staff about the use of wireless devices on boarding the aircraft, if your device offers an Airplane Mode which must be enabled prior to boarding an aircraft. Switch off your wireless device when in hospitals, clinics or other health care facilities. These requests are desinged to prevent possible interference with sensitive medical equipment. Cellular terminals or mobiles operating over radio frequency signal and cellular network cannot be guaranteed to connect in all conditions, for example no mobile fee or with an invalid USIM/SIM card. While you are in this condition and need emergent help, please remember using emergency call. In order to make or receive a call, the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength. Your cellular terminal or mobile contains a transmitter and receiver. When it is ON, it receives and transmits radio frequency energy. 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.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 9 / 46 1.2. FCC statement 1.2.1. FCC Regulations: This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. This device has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiated radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: -Reorient or relocate the receiving antenna. -Increase the separation between the equipment and receiver. -Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -Consult the dealer or an experienced radio/TV technician for help. Caution: Changes or modifications not expressly approved by the party responsible for compliance could void the user„s authority to operate the equipment. 1.2.2. RF Exposure Information This device complies with FCC radiation exposure limits set forth for an uncontrolled environment. In order to avoid the possibility of exceeding the FCC radio frequency exposure limits, human proximity to the antenna shall not be less than 20cm (8 inches) during normal operation. 1.2.3. IMPORTANT NOTE: This module is intended for OEM integrator. The OEM integrator is still responsible for the FCC compliance requirement of the end product, which integrates this module. 20cm minimum distance has to be able to be maintained between the antenna and the users for the host this module is integrated into. Under such configuration, the FCC radiation exposure limits set forth for an population/uncontrolled environment can be satisfied. Any changes or modifications not expressly approved by the manufacturer could void the user's authority to operate this equipment. 1.2.4. USERS MANUAL OF THE END PRODUCT: In the users manual of the end product, the end user has to be informed to keep at least 20cm separation with the antenna while this end product is installed and operated. The end user has to be informed that the FCC radio-frequency exposure guidelines for an uncontrolled environment can be satisfied. The end user has to also be informed that any changes or modifications not expressly approved by the manufacturer could void the user's authority to operate this equipment. If the
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 10 / 46 size of the end product is smaller than 8x10cm, then additional FCC part 15.19 statement is required to be available in the users manual: This device complies with Part 15 of FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation. 1.2.5. LABEL OF THE END PRODUCT: The final end product must be labeled in a visible area with the following " Contains TX FCC ID: QIS201705EM300". If the size of the end product is larger than 8x10cm, then the following FCC part 15.19 statement has to also be available on the label: This device complies with Part 15 of FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 11 / 46 2 Product Concept 2.1. General Description eM300-8a is designed to communicate with infrastructure equipment. The following table shows the frequency bands of eM300-8a module. Table 1: Frequency Bands of eM300-8a Module The eM300-8a is designed to support a very large number of connected terminal devices (up to 100,000 per cell), and it supports adaptive modulation coding and spreading schemes to enable a trade-off between coverage and bit rate. With an ultra-compact profile of 19.9mm × 23.6mm × 2.2mm, the module can meet almost all the requirements for IoT applications, including smart metering, security system, industrial PDA, remote maintenance & control, etc. eM300-8a is an SMD type module with LCC package, which can be easily embedded into applications. It provides abundant hardware interfaces such as ADC and UART interfaces. Designed with power saving technique, the eM300-8a consumes an ultra-low current in PSM (Power Saving Mode). The module fully complies with the RoHS directive of the European Union. Mode eM300-8a TDD 902~928MHz
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 12 / 46 2.2. Key Features The following table describes the detailed features of eM300-8a module. Table 2: eM300-8a Key Features 1. 1) The supply voltage of VDD_EXT should not be greater than that of VBAT. 2. 2) Within operation temperature range, the module is 3GPP compliant. 3. 3) 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 Pout might reduce in Feature Implementation Power Supply VBAT supply voltage: 3.1V ~ 4.2V Typical VBAT supply voltage: 3.6V VDD_EXT supply voltage: 1.7V ~ 3.6V1) Typical VDD_EXT supply voltage: 1.8V or 3.0V Power Saving Ultra-low sleep current Temperature Range  Operation temperature range: -30°C ~ +75°C 2)  Extended temperature range: -40°C ~ +85°C 3) SWD Interface SWD port:  Two lines on SWD port interface: SWD_CLK and SWD_DATA  SWD port can be used for firmware upgrading UART Interfaces Main port:  Three lines on main port interface  Used for AT command communication and data transmission, and the baud rate is 9600bps  Main port can also be used for firmware upgrading, and the baud rate is 115200bps Debug port:  Two lines on debug port interface: DBG_TXD and DBG_RXD  Debug port is used for debugging  Only support 57600bps baud rate Physical Characteristics Size: 19.9±0.15 × 23.6±0.15 × 2.2±0.2mm Weight: Approx 1.6g Firmware Upgrade Firmware upgrade via SWD port or main port Antenna Interface Connected to antenna pad with 50 Ohm impedance control
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 13 / 46 their value and exceed the specified tolerances. When the temperature returns to the normal operating temperature levels, the module will meet 3GPP specifications again. 2.3. Functional Diagram The following figure shows a block diagram of eM300-8a and illustrates the major functional parts.  Radio frequency  Power management  Peripheral interface RF_ANTSwitchRX_SAWRF_PATXFilterVBAT LoadSwitch APT DCDCPMUDCDC32KLDORF Transceiverand AnalogueVDD_EXTTCXO38.4MXTAL DriverBasebandRESETMain UARTDebug UARTFlashSRAMSPISPI Flash(Optional)SWDNETLIGHTADCGPIO Figure 1: Functional Diagram 2.4. Evaluation Board In order to help you to develop applications with eM300-8a, Quectel supplies the evaluation board (EVB), RS-232 to USB cable, power adapter, antenna and other peripherals to control or test the module.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 14 / 46 3 Application Functions 3.1. General Description eM300-8a is equipped with 54-pin 1.1mm pitch SMT pads plus 40-pin ground pads and reserved pads. The following chapters provide detailed descriptions of these pins:  Power supply  SWD interface  UART interfaces  ADC interface  GPIO interface  NETLIGHT  RF interface
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 15 / 46 3.2. Pin Assignment SWD_CLKSWD_DATARESERVEDRESERVEDRESERVEDRESERVEDRESERVEDRESETRESERVED12345610111213141516444546474851525354RESERVEDRESERVEDNETLIGHTDBG_RXDDBG_TXDADCRESERVEDRESERVEDRESERVEDRESERVEDVDD_EXTRESERVEDGPIO3GPIO2GPIO1RESERVEDRIRESERVEDRESERVEDTXDRXDRESERVEDGNDGND27262524232019181798RESERVEDRESERVEDRESERVEDGNDRESERVEDRESERVEDRESERVEDRESERVEDRESERVED74342414039383536373433323130292821225049GNDRF_ANTGNDGNDRESERVEDVBATVBATGNDGNDRESERVEDRESERVEDRESERVED55565758596075767778798090898887868570696867666583 8481 8263 6461 6272 7174 7392 9194 93POWER ADC UART GPIO OTHERSGND RESERVEDSWD ANT Figure 2: Pin Assignment
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 16 / 46 3.3. Pin Description The following tables show the pin definition and description of eM300-8a. 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 OD Open drain Table 4: Pin Description Power Supply Pin Name Pin No. I/O Description DC Characteristics Comment VBAT 45, 46 PI Main power supply of the module: VBAT=3.1V~4.2V Vmax=4.2V Vmin=3.1V Vnorm=3.6V VDD_ EXT 26 PI Power supply for module baseband part Vmax=3.6V Vmin=1.7V Vnorm=1.8V or 3.0V Recommend to add a 2.2~4.7uF bypass capacitor when supplying this pin. GND 2, 42, 43, 47, 48, 51, 52, 54, 59~66, 71~74, 81~83, 92~94 Ground
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 17 / 46 SWD Interface Pin Name Pin No. I/O Description DC Characteristics Comment SWD_ DATA 3 IO Serial wire data signal VOLmax=0.1×VDD_ EXT VOHmin=0.8×VDD_ EXT VILmin=-0.1×VDD_ EXT VILmax=0.2×VDD_ EXT VIHmin=0.7×VDD_ EXT VIHmax=1.1×VDD_ EXT Used for firmware upgrading. SWD_ CLK 4 DI Serial wire clock signal VOLmax=0.1×VDD_ EXT VOHmin=0.8×VDD_ EXT Reset Interface Pin Name Pin No. I/O Description DC Characteristics Comment RESET 15 DI Reset the module RPU≈78kΩ VIHmax=1.1×VDD_ EXT VIHmin=0.7×VDD_ EXT VILmax=0.2×VDD_ EXT Pull up internally. Active low. Network Status Indicator Pin Name Pin No. I/O Description DC Characteristics Comment NETLIGHT 18 DO Network status indication VOLmax=0.1×VDD_ EXT VOHmin=0.8×VDD_ EXT If unused, keep this pin open. ADC interface Pin Name Pin No. I/O Description DC Characteristics Comment ADC 21 AI General purpose analog to digital converter Input voltage range: 0V to VBAT If unused, keep this pin open.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 18 / 46 UART Port Pin Name Pin No. I/O Description DC Characteristics Comment RXD 29 DI Receive data VILmax=0.2×VDD_ EXT VIHmin=0.7×VDD_ EXT VIHmax=1.1×VDD_ EXT VDD_EXT power domain. TXD 30 DO Transmit data VOLmax=0.1×VDD_ EXT VOHmin=0.8×VDD_ EXT VDD_EXT power domain. RI 34 DO Ring indicator VOLmax=0.1×VDD_ EXT VOHmin=0.8×VDD_ EXT VDD_EXT power domain. If unused, keep this pin open. Debug Port Pin Name Pin No. I/O Description DC Characteristics Comment DBG_ RXD 19 DI Receive data VILmax=0.2×VDD_ EXT VIHmin=0.7×VDD_ EXT VIHmax=1.1×VDD_ EXT If unused, keep these pins open. DBG_ TXD 20 DO Transmit data VOLmax=0.1×VDD_ EXT VOHmin=0.8×VDD_ EXT If unused, keep these pins open. GPIO Interfaces Pin Name Pin No. I/O Description DC Characteristics Comment GPIO1 39 IO Digital programmable input/output VOLmax=0.1×VDD_ EXT VOHmin=0.8×VDD_ EXT VILmin=-0.1×VDD_ EXT VILmax=0.2×VDD_ EXT VIHmin=0.7×VDD_ EXT If unused, keep these pins open. GPIO2 40 IO Digital programmable input/output GPIO3 41 IO Digital programmable input/output
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 19 / 46 3.4. Operating Modes eM300-8a module has three operating modes, which can determine availability of functions for different levels of power-saving. Table 5: Overview of Operating Modes VIHmax=1.1×VDD_ EXT RF Interface Pin Name Pin No. I/O Description DC Characteristics Comment RF_ANT 53 IO RF antenna pad Impedance of 50Ω RESERVED Pins Pin Name Pin No. I/O Description DC Characteristics Comment RESERVED 1, 5~14, 16, 17, 22, 23, 24, 25, 27, 28, 31~33, 35~38, 44, 49, 50, 55~58, 67~70, 75~80, 84~91 Reserved Keep these pins unconnected. Mode Function Normal Operation Active In active mode, all functions of the module are available and all processors are active. Radio transmission and reception can be performed. Transitions to idle mode and PSM can only be initiated in Active mode. Idle In idle mode, all processors are inactive, but all peripherals can be active. The system clock is active and power consumption is reduced via clock gating and power gating. Idle mode is entered
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 20 / 46 3.5. Power Supply 3.5.1. Power Supply Pins eM300-8a provides two VBAT pins and one VDD_EXT pin dedicated for connection with the external power supply. The supply voltage of VDD EXT should not be greater than the VBAT voltage. The following table shows the VBAT, VDD_EXT and ground pins. Table 6: VBAT, VDD_EXT and GND Pins Pin Name Pin No. Description Min. Typ. Max. Unit VBAT 45, 46 Main power supply of the module 3.1 3.6 4.2 V VDD_EXT 26 Power supply for module baseband part 1.7 1.8/3.0 3.6 V GND 2, 42, 43, 47, 48, 51, 52, 54, 59~66, 71~74, 81~83, 92~94 Ground - 0 - V 3.5.2. Reference Design for Power Supply The power design for the module is very important, as the performance of the module largely depends on the power source. The VBAT power supply is capable of providing the sufficient current up to 0.5A at least. The VBAT power supply range is from 3.1V to 4.2V and the VDD_EXT supports 1.7V to 3.6V power supply. Make sure that the input voltage of the VBAT will never drop below 3.1V even in burst transmission. If the VBAT power voltage drops below 3.1V, the module will be abnormal. For better power performance, it is recommended to place a 100uF tantalum capacitor with low ESR (ESR=0.7Ω) and three ceramic capacitors with 100nF, 100pF and 22pF near the VBAT pin. In order to increase the number of external power supply interfaces, it is better to use an LDO regulator to supply when all processors are executing a wait-for-interrupt (WFI) instruction. PSM In PSM, only the 32kHz RTC is working, which means the module can be moved to active mode by an RTC interrupt or by an external event through the peripherals that are using the RTC. This mode is entered by all processors setting the “sleep-deep” bit and then executing a WFI instruction.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 21 / 46 power for VDD_EXT. It is also recommended to place a ceramic capacitor with 4.7uF near VDD_EXT pin. The reference circuit is illustrated in the following figure. The trace width of VBAT and VDD_EXT should be designed as wide as possible. In principle, the longer the trace is, the wider it will be. VBATC2C1+C3 C4GND100uF 100nF 100pF 22pFC5GND4.7uFVDD_EXTLDOVBAT Figure 3: Reference Circuit for the VBAT and VDD_EXT Input 3.6. Power on and down Scenarios 3.6.1. Power on The module can be automatically turned on by supplying power source to VBAT pins. VBATRESETDelay>535us Figure 4: Turn-on Timing
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 22 / 46 3.6.2. Power down The module can be turned off by shutting down the VBAT power supply. VBATRESETDelay>5ms Figure 5: Turn-off Timing 3.6.3. Reset the Module The module can be reset by driving the reset pin to a low level voltage for a certain time. The reset timing is illustrated as the following table. Table 7: Reset Characteristics Pin Name Pin No. Description Reset Time RESET 15 Reset the module, low active >100ms
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 23 / 46 The recommended circuit is shown as below. You can use open drain/collector driver or button to control the RESET. Reset pulseRESET4.7K47K Figure 6: Reference Circuit of RESET by Using Driving Circuit RESETS1Close to S1TVS Figure 7: Reference Circuit of RESET by Using Button 3.7. SWD Interface The module provides one SWD (Serial Wire Debug) interface for firmware upgrading. It is recommended to reserve SWD interface in order to upgrade firmware. Table 8: Pin Definition of SWD Interfaces Interfaces Pin Name Pin No. Description SWD SWD_DATA 3 Serial wire data signal SWD SWD_CLK 4 Serial wire clock signal
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 24 / 46 The following figure is a reference design for SWD interface. VDD_EXTSWD_CLKRESETTDIModule (DCE)GNDRTCKJTAG_20 PINVCCTRSTTDORESETNCNCGNDGNDGNDGNDNCGNDGNDGNDGNDGND SWD_DATA SWD_DIOSWD_CLKVDD_EXT Figure 8: Reference Design for SWD Interface 3.8. UART Interfaces The module provides two UART ports: main port and debug port. The module is designed as a DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection. The main port:  TXD: Send data to RXD of DTE.  RXD: Receive data from TXD of DTE.  RI: Ring indicator (when an SMS is received or data is transmitted, the module will output signals to inform DTE). The debug port:  DBG_TXD: Send data to the COM port of computer.  DBG_RXD: Receive data from the COM port of computer. The logic levels are described in the following table. Table 9: Pin Definition of the UART Interfaces Interfaces Pin No. Pin Name Description Comment Debug Port 19 DBG_RXD Receive data VDD_EXT power domain
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 25 / 46 Table 10: Logic Levels of the UART Interfaces 3.8.1. Main Port Main port can be used for AT command communication and data transmission, and the baud rate is 9600bps. It can also be used for firmware upgrading, and the baud rate is 115200bps. The following figure shows the connection between the DCE and DTE. TXDRXDRITXDRXDRINGModule (DCE)Serial portMain portGND GNDPC (DTE) Figure 9: Reference Design for Main Port 20 DBG_TXD Transmit data VDD_EXT power domain Main Port 29 RXD Receive data VDD_EXT power domain 30 TXD Transmit data VDD_EXT power domain 34 RI Ring indicator VDD_EXT power domain Parameter Min. Max. Unit VIL -0.1×VDD_EXT 0.2×VDD_EXT V VIH 0.7×VDD_EXT 1.1×VDD_EXT V VOL 0.1×VDD_EXT V VOH 0.8×VDD_EXT VDD_EXT V
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 26 / 46 3.8.2. Debug Port Debug port can only be used to view log information with UE Log Viewer tool for debugging. The baud rate is 57600bps. A reference design for debug port is shown as below. DBG_TXDDBG_RXDDBG_TXDDBG_RXDModule (DCE)Serial portDebug portGND GNDPC (DTE) Figure 10: Reference Design for Debug Port 3.8.3. The UART Application When the supply voltage of VDD_EXT is 3.0V, the reference design of 3.3V level match is shown as below. PeripheralTXDRXD1KTXDRXDRIEINTModuleVoltage level: 3.3V1K1KGND GND Figure 11: Level Match Design for 3.3V System
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 27 / 46 In order to reduce the power consumption of the system, it is highly recommended to add a resistor circuit on the UART port signal lines when the host‟s voltage level is 3.3V. For systems with a higher voltage level, a level shifter IC could be used between the host and the module. The following circuit shows a reference design for the communication between module and PC. As the electrical level of module is 3.0V, a RS-232 level shifter must be used. Please make sure the I/O voltage of level shifter which connects to module is 3.0V. TXDRXDRIModuleGNDC1+C1-C2+C2-V+VCCGNDV-3.3VT1INT2INT3INT4INR1INR2INR3INR1OUTR2OUTR3OUTT1OUTT2OUTT5OUTT3OUTT4OUTT5INGNDGND/R1OUT 12345789GNDTo PC Main Serial PortGND1K1K1KRS-232 Level Shifter6 Figure 12: Sketch Map for RS-232 Interface Match Please visit vendor web site to select the suitable RS-232 level shifter IC, such as: http://www.exar.com/ and http://www.maximintegrated.com. 3.9. ADC Interface* The module provides a 10-bit ADC input channel to measure the value of voltage. This ADC is available in active mode and idle mode.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 28 / 46 Table 11: Pin Definition of the ADC “*” means under development. 3.10. GPIO Interface The module contains three GPIO pins which are controlled through software. The GPIO pins are controlled by the VDD_EXT power domain. Table 12: Pin Definition of the GPIO interface The GPIO pins are available in active, idle and power saving modes. In active and idle modes, data is sampled and synchronized to the system clock, and interrupts are generated synchronously. In PSM, data is sampled and synchronized to the RTC clock, and interrupts are generated asynchronously. In all the three modes, interrupts can be configured to trigger on rising-edge, falling-edge, high-level or low-level. The GPIO pins can be configured for high drive strength or low drive strength (default) and have optional pull-down resistors. Name Pin No. Description ADC 21 Analog to digital converter Name Pin No. Description GPIO1 39 Digital programmable input/output GPIO2 40 Digital programmable input/output GPIO3 41 Digital programmable input/output
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 29 / 46 3.11. Behaviors of the RI* Table 13: Behaviors of the RI RIIdle A URC or SMS is received HIGHLOW120ms Figure 13: Behaviors of RI When a URC or SMS is Received “*” means under development. 3.12. Network Status Indication* The NETLIGHT signal can be used to drive a network status indicator LED. The working state of this pin is listed in the following table. Table 14: Working State of the NETLIGHT State RI Response Idle HIGH SMS* When an SMS is received, the RI is changed to LOW and kept at low level for about 120ms. Then it is changed to HIGH. URC Certain URCs can trigger RI to LOW for 120ms. Then it is changed to HIGH. State Module Function Low The module is not working or not synchronized with network. High The module is synchronized with network.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 30 / 46 A reference circuit is shown as below. ModuleNETLIGHT 4.7K47K2.2KVBAT Figure 14: Reference Design for NETLIGHT “*” means under development.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 31 / 46 4 Antenna Interface The pin 53 is the RF antenna pad. The RF interface has an impedance of 50Ω. Table 15: Pin Definition of the RF_ANT 4.1. RF Reference Design A reference design for RF is shown as below. ModuleRF_ANT0RNM NM Figure 15: Reference Design for RF eM300-8a provides an RF antenna pad for antenna connection. There is one grounding pad on both sides of the antenna pad in order to give a better grounding. Besides, a π-type match circuit is suggested to be used to adjust the RF performance, and place the π-type matching components as close to the antenna as possible. Name Pin Description GND 51 Ground GND 52 Ground RF_ANT 53 RF antenna pad GND 54 Ground
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 32 / 46 4.2. Reference Design of RF Layout For user‟s PCB, the characteristic impedance of all RF traces should be controlled as 50 ohm. The impedance of the 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). Microstrip line or coplanar waveguide line is typically used in RF layout for characteristic impedance control. The following are reference designs of microstrip line or coplanar waveguide line with different PCB structures. Figure 16: Microstrip Line Design on a 2-layer PCB Figure 17: Coplanar Waveguide Line Design on a 2-layer PCB
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 33 / 46 Figure 18: Coplanar Waveguide Line Design on a 4-layer PCB (Layer 3 as Reference Ground) Figure 19: Coplanar Waveguide Line Design on a 4-layer PCB (Layer 4 as Reference Ground) In order to ensure RF performance and reliability, the following principles should be complied with in RF layout design:  Use impedance simulation tool to control the characteristic impedance of RF traces as 50 ohm.  The GND pins adjacent to RF pins should not be hot welded, 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 area under the signal pin of the antenna connector or solder joint.  The 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 and RF traces should be no less than two times the width of RF signal traces (2*W). For more details about RF layout, please refer to document [2].
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 34 / 46 4.3. RF Receiving Sensitivity Table 16: RF Receiving Sensitivity (MCS-1, BLER <10%) 4.4. Antenna Requirement The following table shows the requirement on eLTE-IoT antenna. Table 17: Antenna Cable Requirement Frequency Range Requirement 863-928MHz Insertion Loss: <1dB Table 18: Antenna Requirements Type Requirements Frequency Range 863-928MHz VSWR ≤2 Gain (dBi) ≤4 Max Input Power (W) 5 Input Impedance (Ω) 50 Polarization Type linear Frequency Receive Sensitivity 902~928MHz -140dBm 863~870MHz -140dBm
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 35 / 46 4.5. RF Cable Welding Welding the RF cable to RF pad of module correctly will reduce the loss on the path of RF, please refer to the following example of RF cable welding. Figure 20: Recommended RF Cable Welding
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 36 / 46 5 Electrical, Reliability and Radio Characteristics 5.1. Absolute Maximum Ratings Absolute maximum ratings for power supply and voltage on digital and analog pins of the module are listed in the following table. Table 19: Absolute Maximum Ratings Parameter Min. Max. Unit VBAT -0.3 +4.2 V VDD_EXT -0.3 +3.6 V Current of Power Supply 0 0.3 A Voltage at Digital Pins -0.3 +3.3 V Voltage at Analog Pins -0.3 +4.2 V Voltage at Digital/Analog Pins in Power Down Mode -0.25 +0.25 V
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 37 / 46 5.2. Operating Temperature The operating temperature is listed in the following table: Table 20: Operating Temperature 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 Pout might reduce in their value and exceed the specified tolerances. When the temperature returns to the normal operating temperature levels, the module will meet 3GPP specifications again. 5.3. Current Consumption The values of current consumption are shown below. Table 21: Current Consumption Parameter Description Conditions Min. Typ. Max. Unit IVBAT PSM Deep sleep state - - - uA Idle mode Standby state 6 mA Active mode Radio transmission (23dBm) 250 mA Radio reception 86 mA Parameter Min. Typ. Max. Unit Operation Temperature Range1) -30 +25 +75 ºC Extended Operation Range2) -40 +85 ºC
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 38 / 46 6 Mechanical Dimensions This chapter describes the mechanical dimensions of the module. 6.1. Mechanical Dimensions of the Module Figure 21: Top and Side Dimensions of eM300-8a Module (Unit: mm)
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 39 / 46 0.851.900.201.950.8523.601.701.701.707.5511.801.105.708.5019.903.305.853.401.703.20 0.553.606.051.106.3540x1.0040x1.0054x0.7054x1.401 Figure 22: Bottom Dimensions of eM300-8a Module (Unit: mm)
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 40 / 46 6.2. Recommended Footprint 0.851.900.200.551.950.851.351.051.5Frame lineSilksreen54x2.423.601.701.701.707.5511.801.106.055.708.5019.901.106.353.305.853.603.4054x0.751.703.2040x1.0040x1.001 Figure 23: Recommended Footprint (Unit: mm) 1. For easy maintenance of the module, please keep about 3mm between the module and other components in the host PCB. 2. All RESERVED pins must not be connected to GND. 3. All dimensions are in millimeters.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 41 / 46 7 Storage, Manufacturing and Packaging 7.1. Storage eM300-8a module is stored in a vacuum-sealed bag. The storage restrictions are shown as below. 1. Shelf life in the vacuum-sealed bag: 12 months at <40ºC /90%RH. 2. After the vacuum-sealed bag is opened, devices that will be subjected to reflow soldering or other high temperature processes must be:  Mounted within 72 hours at the factory environment of ≤30ºC /60% RH.  Stored at <10% RH. 3. Devices require baking before mounting, if any circumstance below occurs:  When the ambient temperature is 23ºC ±5 ºC , humidity indication card shows the humidity is >10% before opening the vacuum-sealed bag.  Device mounting cannot be finished within 72 hours at factory conditions of ≤30ºC /60% 4. If baking is required, devices may be baked for 48 hours at 125ºC ±5 ºC . As the plastic container cannot be subjected to high temperature, it should be removed from devices before high temperature (125ºC ) baking. If shorter baking time is desired, please refer to the IPC/JEDECJ-STD-033 for baking procedure.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 42 / 46 7.2. Manufacturing and 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. To ensure the module soldering quality, the thickness of stencil for the pads at the bottom of the module should be 0.15mm. For more details, please refer to document [1]. It is suggested that the peak reflow temperature is 235 ~ 245ºC (for SnAg3.0Cu0.5 alloy). The absolute max reflow temperature is 260ºC. To avoid damage to the module when it is repeatedly heated, it is suggested that the module should be mounted after reflow soldering for the other side of PCB has been completed. Recommended reflow soldering thermal profile is shown below. Time50 100 150 200 250 30050100150200250 160ºC 200ºC217070s~120s40s~60sBetween 1~3ºC/sPreheat Heating CoolingºCsLiquids Temperature Temperature Figure 24: Reflow Soldering Thermal Profile During manufacturing and soldering, or any other processes that may contact the module directly, NEVER wipe the module label with organic solvents, such as acetone, ethyl alcohol, isopropyl alcohol, trichloroethylene, etc.
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 43 / 46 7.3. 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. 7.3.1. Tape and Reel Packaging The reel is 330mm in diameter and each reel contains 250 modules. Figure 25: Tape Dimensions
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 44 / 46 PS6DETAIL:A DETAIL:A Figure 26: Reel Dimensions
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 45 / 46 8 Appendix A Reference Table 22: Related Documents Table 23: Terms and Abbreviations SN Document Name Remark [1] Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide [2] Quectel_RF_Layout_Application_Note RF Layout Application Note Abbreviation Description ADC Analog-to-Digital Converter DCE Data Communications Equipment (typically module) DTE Data Terminal Equipment (typically computer, external controller) eLTE-IoT Evolved Long Term Evolution Internet of Things I/O Input/Output IC Integrated Circuit Imax Maximum Load Current Inorm Normal Current kbps Kilo Bits Per Second LED Light Emitting Diode PCB Printed Circuit Board PSM Power Saving Mode RF Radio Frequency
eLTE-IoT Module Series eLTE-IoT eM300-8a Hardware Design eLTE-IoT_eM300-8a_Hardware_Design Confidential / Released 46 / 46 RMS Root Mean Square (value) RoHS Restriction of Hazardous Substances RTC Real Time Clock RX Receive Direction USIM Universal Subscriber Identification Module SMS Short Message Service TE Terminal Equipment TX Transmitting Direction UART Universal Asynchronous Receiver & Transmitter URC Unsolicited Result Code VSWR Voltage Standing Wave Ratio Vmax Maximum Voltage Value Vnorm Normal Voltage Value Vmin Minimum Voltage Value VIHmax 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 Input Voltage Value VImin Absolute Minimum Input Voltage Value VOHmax Maximum 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

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