MC20 Hardware Design GSM/GPRS/GNSS Module Series Rev. MC20_Hardware_Design_V1.0 Date: 2016-07-12 www.quectel.
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GSM/GPRS/GNSS Module Series MC20 Hardware Design About the Document History Revision Date Author Description 1.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Contents About the Document ................................................................................................................................ 2 Contents .................................................................................................................................................... 3 Table Index ...................................................................................................................................
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.4.3. Summary of GSM and GNSS Parts’ State in All-in-one Solution.................................. 37 3.4.4. Summary of GSM and GNSS Parts’ State in Stand-alone Solution ............................. 37 3.5. Power on and down .............................................................................................................. 38 3.5.1. Power on ........................................................................................................
GSM/GPRS/GNSS Module Series MC20 Hardware Design 4.3. Bluetooth Antenna Interface .................................................................................................. 71 5 Electrical, Reliability and Radio Characteristics .......................................................................... 74 5.1. Absolute Maximum Ratings .................................................................................................. 74 5.2. Operating Temperature ...................................
GSM/GPRS/GNSS Module Series MC20 Hardware Design Table Index TABLE 1: KEY FEATURES (GMS/GPRS PART OF MC20) .................................................................... 13 TABLE 2: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ............... 15 TABLE 3: KEY FEATURES (GNSS PART OF MC20) ............................................................................. 16 TABLE 4: PROTOCOLS SUPPORTED BY THE MODULE.....................................................................
GSM/GPRS/GNSS Module Series MC20 Hardware Design TABLE 42: DESCRIPTION OF DIFFERENT CODING SCHEMES ......................................................... 93 TABLE 43: GPRS MULTI-SLOT CLASSES .............................................................................................
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure Index FIGURE 1: MODULE FUNCTIONAL DIAGRAM ..................................................................................... 18 FIGURE 2: PIN ASSIGNMENT ............................................................................................................... 20 FIGURE 3: ALL-IN-ONE SOLUTION SCHEMATIC DIAGRAM ............................................................... 26 FIGURE 4: STAND-ALONE SOLUTION SCHEMATIC DIAGRAM ....................
GSM/GPRS/GNSS Module Series MC20 Hardware Design FIGURE 42: MC20 TOP AND SIDE DIMENSIONS (UNIT: MM).............................................................. 81 FIGURE 43: MC20 BOTTOM DIMENSIONS (UNIT: MM) ....................................................................... 82 FIGURE 44: RECOMMENDED FOOTPRINT (UNIT: MM) ...................................................................... 83 FIGURE 45: TOP VIEW OF THE MODULE ..........................................................................
GSM/GPRS/GNSS Module Series MC20 Hardware Design 1 Introduction This document defines the MC20 module and describes its hardware interface which is connected with the customer application as well as its air interface. The document can help you quickly understand module interface specifications, as well as the electrical and mechanical details. Associated with application note and user guide, you can use MC20 module to design and set up mobile applications easily. 1.1.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 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 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.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 2 Product Concept 2.1. General Description MC20 is a multi-purpose module which integrates a high performance GNSS engine and a quad-band GSM/GPRS engine. It can work as all-in-one solution or stand-alone solution according to customers' application demands. For detailed introduction on all-in-one solution and stand-alone solution, please refer to Chapter 3.2.
GSM/GPRS/GNSS Module Series MC20 Hardware Design The module fully complies with the RoHS directive of the European Union. 2.2. Directives and Standards The MC20module is designed to comply with the FCC statements. FCC ID: XMR201609MC20 The Host system using MC20 should have label “contains FCC ID: XMR201609MC20”. 2.2.1. 2.2.1. FCC Statement Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. 2.2.2.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Power Supply Single supply voltage: 3.3V ~ 4.6V Typical supply voltage: 4V Power Saving Typical power consumption in SLEEP mode (GNSS is powered off): 1.2mA@DRX=5 0.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Multiplexing function Support autobauding from 4800bps to 115200bps Debug Port: Two lines on debug port interface DBG_TXD and DBG_RXD Debug port only used for firmware debugging Auxiliary Port: Two lines on auxiliary port interface: TXD_AUX and RXD_AUX Used for communication with the GNSS Part in all-in-one solution Phonebook Management Support phonebook types: SM, ME, ON, MC, RC, DC, LD, LA SIM Application Toolkit Support SAT class 3, GSM 1
GSM/GPRS/GNSS Module Series MC20 Hardware Design Table 3: Key Features (GNSS Part of MC20) Features Implementation GNSS GPS+BeiDou Power Supply Supply voltage: 2.8V~4.3V Power Consumption Acquisition: 25mA @-130dBm (GPS) Tracking: 19mA @-130dBm (GPS) Acquisition: 23mA @-130dBm (GPS+BeiDou) Tracking: 18mA @-130dBm (GPS+BeiDou) Standby: 300uA @VCC=3.3V Backup: 14uA @V_BCKP=3.3V Receiver Type GPS L1 1575.42MHz C/A Code BeiDou B1 1561.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 1) In this mode, GNSS part’s backup domain should be valid. Table 4: Protocols Supported by the Module Protocol Type NMEA output, ASCII, 0183, 3.01 PMTK Input/output, MTK proprietary protocol NOTE Please refer to document [2] for details of NMEA standard protocol and MTK proprietary protocol. 2.4. Functional Diagram The following figure shows a block diagram of MC20 and illustrates the major functional parts.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 1: Module Functional Diagram 2.5. Evaluation Board In order to help you develop applications with MC20, Quectel supplies an evaluation board (EVB), TE-A board, RS-232 to USB cable, power adapter, earphone, GSM antenna, GNSS antenna and other peripherals to control or test the module. For details, please refer to document [11].
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3 Application Functions MC20 is an SMD type module with 54 LCC pads and 14 LGA pads. The following chapters provide detailed descriptions about these pins.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.1. Pin of Module 3.1.1. Pin Assignment Figure 2: Pin Assignment NOTE Please keep all reserved pins open.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.1.2. Pin Description Table 5: I/O Parameters Definition Type Description IO Bidirectional input/output DI Digital input DO Digital output PI Power input PO Power output AI Analog input AO Analog output Table 6: Pin Description Power Supply PIN Name VBAT PIN No. 50, 51 I/O Description DC Characteristics Comment PI Power supply of GSM/GPRS part: VBAT=3.3V~4.6V VImax=4.6V VImin=3.3V VInorm=4.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 31,40, 42,44, 45,48, 49 Turn on/off PIN Name PWRKEY PIN No. 5 I/O Description DC Characteristics DI Power on/off key. PWRKEY should be pulled down for a moment to turn on or turn off the system. VILmax= 0.1×VBAT VIHmin= 0.6×VBAT VIHmax=3.1V DC Characteristics Comment Audio Interface PIN Name PIN No. I/O Description MICP MICN 1, 2 AI Positive and negative voice input If unused, keep these pins open.
GSM/GPRS/GNSS Module Series MC20 Hardware Design RXD 33 DI Receive data DTR 37 DI Data terminal ready RI 35 DO Ring indication DCD 36 DO Data carrier detection CTS 38 DO Clear to send RTS 39 DI Request to send PIN Name PIN No. I/O Description DBG_ TXD 29 DO Transmit data DBG_ RXD 30 DI Receive data VILmax= 0.25×VDD_EXT VIHmin= 0.75×VDD_EXT VIHmax= VDD_EXT+0.2 VOHmin= 0.85×VDD_EXT VOLmax= 0.
GSM/GPRS/GNSS Module Series MC20 Hardware Design SIM1_ DATA SIM2_ DATA 21 11 SIM1_ RST SIM2_ RST 20 12 SIM_ GND 16 SIM1_ PRESENCE 37 IO DO VOHmin= 0.85×SIM_VDD VILmax= 0.25×SIM_VDD VIHmin= 0.75×SIM_VDD VOLmax= 0.15×SIM_VDD VOHmin= 0.85×SIM_VDD SIM data Maximum trace length is 200mm from the module pad to SIM card holder. VOLmax= 0.15×SIM_VDD VOHmin= 0.85×SIM_VDD SIM reset SIM ground SIM1 card detection VILmin =0V VILmax = 0.25×VDD_EXT VIHmin = 0.75×VDD_EXT VIHmax = VDD_EXT+0.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Antenna Interface PIN Name PIN No. I/O Description DC Characteristics Comment RF_ ANT 41 IO GSM antenna pad Impedance of 50Ω BT_ ANT 32 IO BT antenna pad Impedance of 50Ω GNSS_ ANT 15 I GNSS signal input Impedance of 50Ω I/O Description DC Characteristics Comment VOHmin= 0.85×VDD_EXT VOLmax= 0.15×VDD_EXT Refer to Chapter 3.3.3.2 in all-in-one solution. Keep this pin open in If unused, keep this pin open.
GSM/GPRS/GNSS Module Series MC20 Hardware Design transmitted through UART port, thus realizing communication between the module and the MCU. In stand-alone solution, GSM data and AT commands are transmitted through UART port; while GNSS data such as PMTK command and NMEA sentences output are transmitted through GNSS UART port. The hardware difference between all-in-one solution and stand-alone solution mainly lies in the connection method of UART, UART_AUX, and GNSS_UART.
GSM/GPRS/GNSS Module Series MC20 Hardware Design NOTE In order to ensure the normal operation of GNSS part, please don't power off the GSM part. Table 8: Comparison between All-in-one and Stand-alone Solution All-in-one. Stand-alone Remarks Firmware upgrade via UART Port (GSM and GNSS Parts share the same firmware package) Firmware upgrade via UART Port (GSM and GNSS Parts share the same firmware package) Refer to Chapter 3.6.1.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 5: Voltage Ripple during Transmitting (GSM Part) The power supply for GNSS part is controlled by the GSM part through AT command control over GNSS_VCC_EN pin. 3.3.2. Decrease Supply Voltage Drop 3.3.2.1. Decrease Supply Voltage Drop for GSM Part Power supply range of the GSM part is from 3.3V to 4.6V. Make sure that the input voltage will never drop below 3.3V even in a burst transmission. If the power voltage drops below 3.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 6: Reference Circuit for the VBAT Input (GSM Part) 3.3.2.2. Decrease Supply Voltage Drop for GNSS Part Power supply range of GNSS part is from 2.8 to 4.3V. GNSS_VCC’s maximum average current is 40mA during GNSS acquisition after power up. So it is important to supply sufficient current and make the power clean and stable. The decouple combination of 10uF and 100nF capacitor is recommended nearby GNSS_VCC pin.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.3.3. Reference Design for Power Supply 3.3.3.1. Reference Design for Power Supply of GSM Part The power supply of GSM part is capable of providing sufficient current up to 2A at least. If the voltage drop between the input and output is not too high, it is suggested to use a LDO as the GSM part’s power supply.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.3.3.2. Reference Design for Power Supply of GNSS Part The power supply for GNSS part is controlled by the GSM part through AT command control over GNSS_VCC_EN pin. A reference circuit for the GNSS part power supply is given below. Please pay attention to the electrical characteristics of GNSS_VCC_EN to match LDO’s EN pin. Please refer to document [1] for details about the AT commands for GNSS control. Figure 9: Reference Circuit Design for GNSS Part 3.3.
GSM/GPRS/GNSS Module Series MC20 Hardware Design The main power supply (VBAT) is remained The GSM part is powered on The GNSS part is turned off by AT+QGNSSC=0 command via UART In this case, the VRTC pin can be kept floating. A reference schematic diagram is shown below. Figure 10: Internal GNSS’s Backup Domain Power Construction 3.4. Operating Modes 3.4.1. Operating Modes of GSM Part The table below briefly summarizes the various operating modes of GSM part mentioned in the following chapters.
GSM/GPRS/GNSS Module Series MC20 Hardware Design GPRS IDLE The GSM part is not registered on GPRS network. It is not reachable through GPRS channel. GPRS STANDBY The GSM part is registered on GPRS network, but no GPRS PDP context is active. The SGSN knows the Routing Area where the module is located at. GPRS READY The PDP context is active, but no data transfer is ongoing. The GSM part is ready to receive or send GPRS data. The SGSN knows the cell where the module is located at.
GSM/GPRS/GNSS Module Series MC20 Hardware Design After the GSM part is set by AT+CFUN=0 or AT+CFUN=4, it can return to full functionality mode by AT+CFUN=1. For detailed information about AT+CFUN, please refer to document [1]. 3.4.1.2. SLEEP Mode SLEEP mode is disabled by default. It can be enabled by AT+QSCLK=1 and the premise is that the GNSS is powered off. The default setting is AT+QSCLK=0, and in this mode, the GSM part cannot enter SLEEP mode.
GSM/GPRS/GNSS Module Series MC20 Hardware Design from specific satellites. When the GNSS_VCC is valid, the GNSS part will enter into full on mode automatically. The following table describes the default configuration of full on mode.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.4.2.2. Standby Mode Standby mode is a low-power consumption mode. In standby mode, the internal core and I/O power domain are still active; but RF and TCXO are powered off, and the GNSS part stops satellites search and navigation. The way to enter into standby mode is using PMTK commands. When the GNSS part exits from standby mode, it will use all internal aiding information like GNSS time, ephemeris, last position, etc.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.4.3. Summary of GSM and GNSS Parts’ State in All-in-one Solution Table 11: Combination States of GSM and GNSS Parts in All-in-one Solution GSM Part Modes GNSS Part Modes Full on Standby Backup Normal Sleep Minimum Functionality 3.4.4.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.5. Power on and down 3.5.1. Power on The module can be turned on by driving the pin PWRKEY to a low level voltage. An open collector driver circuit is suggested to control the PWRKEY. A simple reference circuit is illustrated as below. Figure 11: Turn on the Module with an Open-collector Driver NOTES 1. MC20 module is set to autobauding mode (AT+IPR=0) by default.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 12: Turn on the Module with a Button Command AT+QGNSSC=1 should be sent to enable the GNSS power supply after the GSM part is running. When the GNSS_VCC is valid, the GNSS will enter into full on mode automatically. The turn-on timing is illustrated in the following figure.
GSM/GPRS/GNSS Module Series MC20 Hardware Design NOTE Make sure that VBAT is stable before pulling down PWRKEY pin. The time of T1 is recommended to be 100ms. 3.5.2. Power down The following procedures can be used to turn off the module: Normal power down procedure: Turn off module using the PWRKEY pin Normal power down procedure: Turn off module using command AT+QPOWD Under-voltage automatic shutdown: Take effect when under-voltage is detected. 3.5.2.1.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 14: Turn-off Timing by Using the PWRKEY Pin 3.5.2.2. Power down Module Using AT Command It is also a safe way to turn off the module via AT command AT+QPOWD=1. This command will let the module log off from the network and allow the firmware to save important data before completely disconnecting the power supply.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.5.2.3. Power down GNSS Part Alone Using AT Command It is a safe way to turn off the GNSS part alone via AT command AT+QGNSSC=0. The power down scenario for GNSS part is illustrated in the following figure. Figure 15: Turn-off Timing of GNSS Part by Using AT Command 3.5.2.4. Under-voltage Automatic Shutdown The module will constantly monitor the voltage applied on the VBAT. If the voltage is ≤3.
GSM/GPRS/GNSS Module Series MC20 Hardware Design UNDER_VOLTAGE POWER DOWN After that moment, no further AT commands can be executed. The module logs off from network and enters into power down mode. NOTE When unsolicited result codes do not appear when autobauding is active and DTE & DCE are not correctly synchronized after start-up, the module is recommended to be set to a fixed baud rate. 3.6.
GSM/GPRS/GNSS Module Series MC20 Hardware Design RXD_AUX: Keep open except during firmware upgrade. The GNSS UART Port In all-in-one solution: GNSS_TXD: Send data to the GSM part. GNSS_RXD: Receive data from the GSM part. In stand-alone solution: GNSS_TXD: Send GNSS data to the COM port of peripheral. GNSS_RXD: Receive GNSS data from the COM port of peripheral. The logic levels are described in the following table. Table 13: Logic Levels of the UART Interface Parameter Min. Max.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Auxiliary UART Port1) DBG_TXD 29 Transmit data RXD_AUX1) 24 Receive data TXD_AUX1) 25 Transmit data GNSS_RXD 23 Receive data GNSS_TXD 22 Transmit data GNSS UART Port NOTE 1) It is recommended to keep these pins open in stand-alone solution, except during firmware upgrade. 3.6.1. UART Port 3.6.1.1.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Synchronization between DTE and DCE: When DCE (the module) is powered on with autobauding enabled, it is recommended to wait 2 to 3 seconds before sending the first AT character. After receiving the “OK” response, DTE and DCE are correctly synchronized. If the host controller needs URC in the mode of autobauding, it must be synchronized firstly. Otherwise the URC will be discarded.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 16: Reference Design for Full-Function UART Three-line connection is shown as below. Figure 17: Reference Design for UART Port (Three Line Connection) A reference design for UART Port with hardware flow control is shown as below. The connection will enhance the reliability of the mass data communication.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 18: Reference Design for UART Port with Hardware Flow Control 3.6.1.3. Firmware Upgrade TXD and RXD can be used for firmware upgrade in both all-in-one solution and stand-alone solution. The PWRKEY pin must be pulled down before firmware upgrade. A reference circuit is shown as below: Figure 19: Reference Design for Firmware Upgrade NOTES 1. 2.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.6.2. Debug Port Two lines: DBG_TXD and DBG_RXD. The port outputs log information automatically. Debug Port is only used for firmware debugging and its baud rate must be configured as 460800bps. Figure 20: Reference Design for Debug Port 3.6.3. Auxiliary UART Port and GNSS UART Port 3.6.3.1.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 21: Auxiliary and GNSS UART Port Connection in All-in-one Solution NOTE As the GNSS part of MC20 module outputs more data than a single GNSS system, the default output NMEA types running in 4800bps baud rate and 1Hz update rate will lose some data. The solution to avoid losing data in 4800bps baud rate and 1Hz update rate is to decrease the output NMEA types.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 22: Auxiliary and GNSS UART Port Connection in Stand-alone Solution 3.6.4. UART Application A reference design of 3.3V level match is shown as below. If the host is a 3V system, please change the 5.6K resistors to 10K ones. Figure 23: Level Match Design for 3.3V System NOTE It is highly recommended to add the resistor divider circuit on the UART signal lines when the host’s level is 3V or 3.3V.
GSM/GPRS/GNSS Module Series MC20 Hardware Design The following figure shows a sketch map between the module and the standard RS-232 interface. As the electrical level of module is 2.8V, a RS-232 level shifter must be used. Note that you should assure the I/O voltage of level shifter which connects to module is 2.8V. Figure 24: Sketch Map for RS-232 Interface Match Please visit vendors’ websites to select a suitable IC, such as: http://www.maximintegrated.com and http://www.exar.com/. 3.7.
GSM/GPRS/GNSS Module Series MC20 Hardware Design SPKP 3 Channel 1 Audio positive output SPKN 4 Channel 1 Audio negative output MICP 1 Microphone positive input MICN 2 Microphone negative input LOUDSPKP 54 Channel 2 Audio positive output LOUDSPKN 53 Channel 2 Audio negative output AIN/AOUT2 AIN can be used for input of microphone and line. An electret microphone is usually used. AIN are differential input channels. AOUT1 is used for output of receiver.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.7.1. Decrease TDD Noise and Other Noises The 33pF capacitor is applied for filtering out 900MHz RF interference when the module is transmitting at EGSM900MHz. Without placing this capacitor, TDD noise could be heard. Moreover, the 10pF capacitor here is used for filtering out 1800MHz RF interference. However, the resonant frequency point of a capacitor largely depends on the material and production technique.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.7.3. Receiver and Speaker Interface Design Figure 26: Handset Interface Design for AOUT1 Figure 27: Speaker Interface Design with an Amplifier for AOUT1 A suitable differential audio amplifier can be chosen from the Texas Instrument’s website (http://www.ti.com/). There are also other excellent audio amplifier vendors in the market.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.7.4. Earphone Interface Design Figure 28: Earphone Interface Design 3.7.5.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.7.6. Audio Characteristics Table 17: Typical Electret Microphone Characteristics Parameter Min. Typ. Max. Unit Working Voltage 1.2 1.5 2.0 V Working Current 200 500 uA External Microphone Load Resistance 2.2 K Ohm Table 18: Typical Speaker Characteristics Parameter Min. Load resistance Typ. Max. 32 Unit Ohm Single-ended Reference level AOUT1 Output 0 Load resistance 2.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Table 19: Pin Definition of the SIM Interface Pin Name Pin No. Description SIM1_VDD 18 Supply power for SIM card. Automatic detection of SIM1 card voltage. 3.0V±5% and 1.8V±5%. Maximum supply current is around 10mA. SIM1_CLK 19 SIM1 card clock. SIM1_DATA 21 SIM1 card data I/O. SIM1_RST 20 SIM1 card reset. SIM1_PRESENCE 37 SIM1 card detection. SIM_GND 16 SIM card ground. SIM2_VDD 13 Supply power for SIM card.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 30: Reference Circuit for SIM1 Interface with an 8-pin SIM Card Holder If SIM1 card detection function is not used, keep SIM1_PRESENCE pin open. A reference circuit for a 6-pin SIM card socket is shown in the following figure. Figure 31: Reference Circuit for SIM1 Interface with a 6-pin SIM Card Holder The following figure is a reference design for SIM2 interface with a 6-pin SIM card holder.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 32: Reference Circuit for SIM2 Interface with a 6-pin SIM Card Holder For more information http://www.molex.com/. of SIM card holder, you can visit http://www.amphenol.com/ and In order to enhance the reliability and availability of the SIM card in application, please conform to the following criteria in the SIM circuit design: Keep layout of SIM card as close to the module as possible.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.9. ADC The module provides an ADC channel to measure the value of voltage. Please give priority to the use of ADC0 channel. Command AT+QADC can read the voltage value applied on ADC0 pin. For details of this AT command, please refer to document [1]. In order to improve the accuracy of ADC, the layout of ADC should be surrounded by ground. Table 20: Pin Definition of the ADC Pin Name Pin No. Description ADC 6 Analog to digital converter.
GSM/GPRS/GNSS Module Series MC20 Hardware Design URC Certain URCs can trigger 120ms low level on RI. For more details, please refer to document [1] If the module is used as a caller, the RI would maintain high except when the URC or SMS is received. When it is used as a receiver, the timing of RI is shown below.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.11. 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 23: Working State of the NETLIGHT State Module Function Off The module is not running. 64ms On/800ms Off The module is not synchronized with network. 64ms On/2000ms Off The module is synchronized with network.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.12. EASY Autonomous AGPS Technology Supplying aiding information like ephemeris, almanac, rough last position, time and satellite status, can help improve the acquisition sensitivity and the TTFF for a module. This is called as EASY technology and MC20’s GNSS part supports it. EASY technology works as embedded software which can accelerate TTFF by predicting satellite navigation messages from received ephemeris.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 3.14. Multi-tone AIC MC20 module has a function called multi-tone AIC (Active Interference Cancellation) to decease harmonic of RF noise from Wi-Fi, GSM, 3G and 4G. Up to 12 multi-tone AIC embedded in the module can provide effective narrow-band interference and jamming elimination. The GNSS signal could be demodulated from the jammed signal, which can ensure better navigation quality. AIC function is enabled by default.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 4 Antenna Interface MC20 has three antenna interfaces which are used for GSM antenna, GNSS antenna and BT antenna, respectively. The Pin 41 is the GSM antenna pad; the Pin 15 is the GNSS antenna pad; and Pin 32 is the BT antenna pad. The RF interface of the three antenna pads has an impedance of 50Ω. 4.1. GSM Antenna Interface There is a GSM antenna pad named RF_ANT for MC20. Table 24: Pin Definition of the RF_ANT Pin Name Pin No.
GSM/GPRS/GNSS Module Series MC20 Hardware Design MC20 provides an RF antenna pad for antenna connection. The RF trace in host PCB connected to the module’s RF antenna pad should be coplanar waveguide line or microstrip line, whose characteristic impedance should be close to 50Ω. MC20 comes with grounding pads which are next to the antenna pad in order to give a better grounding. Besides, a π type matching circuit is suggested to be used to adjust the RF performance.
GSM/GPRS/GNSS Module Series MC20 Hardware Design PCS1900 30dBm±2dB 0dBm±5dB NOTE In GPRS 4 slots TX mode, the maximum output power is reduced by 2.5dB. This design conforms to the GSM specification as described in section 13.16 of 3GPP TS 51.010-1. 4.1.3. RF Receiving Sensitivity Table 28: RF Receiving Sensitivity Frequency Receive Sensitivity GSM850 < -110dBm EGSM900 < -110dBm DCS1800 < -110dBm PCS1900 < -110dBm 4.1.4.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 38: RF Soldering Sample 4.2. GNSS Antenna Interface The GNSS part of MC20 module supports both GPS and BeiDou systems. The RF signal is obtained from the GNSS_ANT pin. The impedance of RF trace should be controlled as 50 Ohm, and the trace length should be kept as short as possible. 4.2.1. Antenna Specifications The module can be connected to a dedicated GPS/BeiDou passive or active antenna to receive GPS/BeiDou satellite signals.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Gain (antenna): >-2dBi Gain (embedded LNA): 20dB (Typ.) Total gain: >18dBi (Typ.) 4.2.2. Active Antenna The following figure is a typical reference design with active antenna. In this mode, the antenna is powered by GNSS_VCC. Figure 39: Reference Design with Active Antenna C1, R1 and C2 are reserved matching circuit for antenna impedance modification. By default, C1 and C2 are not mounted; R1 is 0 ohm. The external active antenna is powered by GNSS_VCC.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 4.2.3. Passive Antenna Figure 40: Reference Design with Passive Antenna The above figure is a typical reference design with passive antenna. C1, R1 and C2 are reserved matching circuit for antenna impedance modification. C1 and C2 are not mounted by default; R1 is 0 ohm. Impedance of RF trace should be controlled as 50 ohm and the trace length should be kept as short as possible. 4.3.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Table 31: Pin Definition of the BT_ANT Pin Name Pin No. Description BT_ANT 32 BT antenna pad GND 31 Ground The external antenna must be matched properly to achieve the best performance, so the matching circuit is necessary.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Peak Gain 3 dBi Typ Impedance 50Ω Typ MC20_Hardware_Design Confidential / Released 73 / 95
GSM/GPRS/GNSS Module Series MC20 Hardware Design 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 33: Absolute Maximum Ratings Parameter Min. Max. Unit VBAT -0.3 +4.73 V GNSS_VCC -0.3 +4.5 V Peak Current of Power Supply (VBAT) 0 2 A RMS Current of Power Supply (VBAT, during one TDMA-frame) 0 0.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Table 34: Operating Temperature Parameter Min. Typ. Max. Unit Operation temperature range 1) -35 +25 +75 ℃ Extended temperature range 2) -40 +85 ℃ NOTES 1. 2. 1) Within operation temperature range, the module is 3GPP compliant. Within extended temperature range, the module remains the ability to establish and maintain a voice, SMS, data transmission, emergency call, etc. There is no unrecoverable malfunction.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Peak supply current (during transmission slot) DATA mode, GPRS (3Rx, 2Tx) GSM850/EGSM9001) DCS1800/PCS19002) 359/360 232/250 mA mA DATA mode, GPRS (2 Rx, 3Tx) GSM850/EGSM9001) DCS1800/PCS19002) 431/413 311/339 mA mA DATA mode, GPRS (4 Rx, 1Tx) GSM850/EGSM9001) DCS1800/PCS19002) 215/153 153/162 mA mA DATA mode, GPRS (1Rx, 4Tx) GSM850/EGSM9001) DCS1800/PCS19002) 499/4693) 392/427 mA mA Maximum power control level on GSM850 and EGSM900. 1.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 5.4.
GSM/GPRS/GNSS Module Series MC20 Hardware Design @power level #19, Typical 101mA DCS1800 @power level #0 <490mA, Typical 305mA @power level #7, Typical 131mA @power level #15, Typical 93mA PCS1900 @power level #0 <480mA, Typical 348mA @power level #7, Typical 138mA @power level #15, Typical 94mA DATA Mode, GPRS (4 Rx,1Tx) CLASS 12 GSM850 @power level #5 <350mA, Typical 216mA @power level #12, Typical 103mA @power level #19, Typical 83mA EGSM900 @power level #5 <350mA, Typical 222mA @power level #12
GSM/GPRS/GNSS Module Series MC20 Hardware Design Table 38: Current Consumption of the GNSS Part Parameter Conditions Typ. Unit IVCC @Acquisition @VCC=3.3V (GPS) 25 mA IVCC @Tracking @VCC=3.3V (GPS) 19 mA IVCC @Acquisition @VCC=3.3V (GPS+BeiDou) 23 mA IVCC @Tracking @VCC=3.3V (GPS+BeiDou) 18 mA IVCC @Standby @VCC=3.3V 0.3 mA IBCKP @backup @V_BCKP=3.3V 14 uA NOTE The tracking current is tested in following conditions: For Cold Start, 10 minutes after First Fix.
GSM/GPRS/GNSS Module Series MC20 Hardware Design MC20_Hardware_Design Confidential / Released 80 / 95
GSM/GPRS/GNSS Module Series MC20 Hardware Design 6 Mechanical Dimensions This chapter describes the mechanical dimensions of the module. 6.1.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Figure 43: MC20 Bottom Dimensions (Unit: mm) MC20_Hardware_Design Confidential / Released 82 / 95
GSM/GPRS/GNSS Module Series MC20 Hardware Design 6.2. Recommended Footprint Figure 44: Recommended Footprint (Unit: mm) NOTES 1. 2. For convenient maintenance, the module should be kept about 3mm away from the other components in the host PCB. The circular test points with a radius of 1.75mm in the above recommended footprint should be treated as keepout areas. (“keepout” means do not pour copper on the mother board).
GSM/GPRS/GNSS Module Series MC20 Hardware Design 6.3. Top and Bottom View of the Module Figure 45: Top View of the Module Figure 46: Bottom View of the Module NOTE These are design effect drawings of MC20 module. For more accurate pictures, please refer to the module that you get from Quectel.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 7 Storage and Manufacturing 7.1. Storage MC20 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 and <90%RH. 2. After the vacuum-sealed bag is opened, devices that need to be mounted directly must be: Mounted within 72 hours at the factory environment of ≤30ºC and <60% RH. Stored at <10% RH. 3.
GSM/GPRS/GNSS Module Series MC20 Hardware Design thickness of stencil at the hole of the module pads should be 0.2 mm for MC20. For more details, please refer to document [12] It is suggested that the peak reflow temperature is from 235ºC to 245ºC (for SnAg3.0Cu0.5 alloy). The absolute maximum reflow temperature is 260ºC. To avoid damage to the module caused by repeated heating, it is suggested that the module should be mounted after reflow soldering for the other side of PCB has been completed.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 7.3.1. Tape and Reel Packaging Figure 48: Tape and Reel Specification Figure 49: Dimensions of Reel Table 40: Reel Packaging Model Name MC20 MC20_Hardware_Design MOQ for MP Minimum Package:250pcs Minimum Packagex4=1000pcs 250pcs Size: 370mm×350mm×56mm N.W: 0.32kg G.W: 1.08kg Size: 380mm×250mm×365mm N.W: 1.28kg G.W: 4.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 8 Appendix A References Table 41: Related Documents SN Document Name Remark [1] Quectel_MC20_AT_Commands_Manual MC20 AT commands manual [2] ITU-T Draft new recommendation V.25ter Serial asynchronous automatic dialing and control [3] GSM 07.07 Digital cellular telecommunications (Phase 2+); AT command set for GSM Mobile Equipment (ME) [4] GSM 07.10 Support GSM 07.10 multiplexing protocol GSM 07.
GSM/GPRS/GNSS Module Series MC20 Hardware Design [10] GSM_UART_Application_Note UART port application note [11] GSM_EVB_User_Guide GSM EVB user guide [12] Module_Secondary_SMT_User_Guide Module secondary SMT user guide [13] Quectel_GSM_Module_Digital_IO_Application_Note GSM Module Digital IO Application Note Table 42: Terms and Abbreviations Abbreviation Description ADC Analog-to-Digital Converter AMR Adaptive Multi-Rate ARP Antenna Reference Point ASIC Application Specific Integrated
GSM/GPRS/GNSS Module Series MC20 Hardware Design DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic Compatibility ESD Electrostatic Discharge ETS European Telecommunication Standard FCC Federal Communications Commission (U.S.) FDMA Frequency Division Multiple Access FR Full Rate FS File System GMSK Gaussian Minimum Shift Keying GPRS General Packet Radio Service GSM Global System for Mobile Communications G.
GSM/GPRS/GNSS Module Series MC20 Hardware Design MS Mobile Station (GSM engine) MT Mobile Terminated N.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 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 VInorm Absolute Normal 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 Voltag
GSM/GPRS/GNSS Module Series MC20 Hardware Design 9 Appendix B GPRS Coding Schemes Four coding schemes are used in GPRS protocol. The differences between them are shown in the following table. Table 43: Description of Different Coding Schemes USF Pre-coded USF Radio Block excl.USF and BCS BCS 1/2 3 3 181 CS-2 2/3 3 6 CS-3 3/4 3 CS-4 1 3 Scheme Code Rate CS-1 Tail Coded Bits Punctured Bits Data Rate Kb/s 40 4 456 0 9.05 268 16 4 588 132 13.
GSM/GPRS/GNSS Module Series MC20 Hardware Design Radio block structure of CS-4 is shown as the following figure.
GSM/GPRS/GNSS Module Series MC20 Hardware Design 10 Appendix C GPRS Multi-slot Classes Twenty-nine classes of GPRS multi-slot modes are defined for MS in GPRS specification. Multi-slot classes are product dependent, and determine the maximum achievable data rates in both the uplink and downlink directions. Written as 3+1 or 2+2, the first number indicates the amount of downlink timeslots, while the second number indicates the amount of uplink timeslots.
