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Quectel EC21 Series Hardware Design

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EC21
Hardware Design
LTE Module Series
Rev. EC21_Hardware_Design_V1.4
Date: 2017-03-01
www.quectel.com

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Summary of Contents for Quectel EC21 Series

  • Page 1 EC21 Hardware Design LTE Module Series Rev. EC21_Hardware_Design_V1.4 Date: 2017-03-01 www.quectel.com...
  • Page 2 QUECTEL OFFERS THE INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED IS BASED UPON CUSTOMERS’ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION.

  • Page 3: About The Document

    LTE Module Series EC21 Hardware Design About the Document History Revision Date Author Description 2016-04-15 Yeoman CHEN Initial 1. Updated frequency bands in Table 1. 2. Updated transmitting power, supported maximum baud rate of main UART, supported internet protocols, supported USB drivers of USB interface, and temperature range in Table 2.

  • Page 4: 4. Added Bt Interface In Chapter 3.18.2

    LTE Module Series EC21 Hardware Design 6.4. 10. Added note about SIMO in Chapter 6.6. 1. Updated frequency bands in Table 1. 2. Updated function diagram in Figure 1. 3. Updated pin assignment (top view) in Figure 2. 4. Added BT interface in Chapter 3.18.2. 5.

  • Page 5: Table Of Contents

    LTE Module Series EC21 Hardware Design Contents About the Document ..........................2 Contents ..............................4 Table Index ............................... 6 Figure Index .............................. 8 Introduction ............................. 10 1.1. Safety Information ........................11 Product Concept ..........................12 2.1. General Description ......................12 2.2. Key Features .........................
  • Page 6 LTE Module Series EC21 Hardware Design 3.15. STATUS ..........................50 3.16. Behavior of the RI ......................... 51 3.17. SGMII Interface ........................51 3.18. Wireless Connectivity Interfaces ................... 54 3.18.1. WLAN Interface ......................56 3.18.2. BT Interface* ........................ 56 3.19. USB_BOOT Interface ......................57 GNSS Receiver ..........................
  • Page 7 TABLE 37: EC21-V CURRENT CONSUMPTION ..................... 74 TABLE 38: EC21-AUV CURRENT CONSUMPTION ..................74 TABLE 39: GNSS CURRENT CONSUMPTION OF EC21 SERIES MODULE ..........75 TABLE 40: RF OUTPUT POWER ........................76 TABLE 41: EC21-E CONDUCTED RF RECEIVING SENSITIVITY ..............76...
  • Page 8 LTE Module Series EC21 Hardware Design TABLE 42: EC21-A CONDUCTED RF RECEIVING SENSITIVITY ..............77 TABLE 43: EC21-V CONDUCTED RF RECEIVING SENSITIVITY ..............77 TABLE 44: EC21-AUT CONDUCTED RF RECEIVING SENSITIVITY ............. 77 TABLE 45: EC21-AUTL CONDUCTED RF RECEIVING SENSITIVITY ............78 TABLE 46: EC21-KL CONDUCTED RF RECEIVING SENSITIVITY ..............
  • Page 9 LTE Module Series EC21 Hardware Design Figure Index FIGURE 1: FUNCTIONAL DIAGRAM ....................... 16 FIGURE 2: PIN ASSIGNMENT (TOP VIEW) ....................18 FIGURE 3: SLEEP MODE APPLICATION VIA UART ..................29 FIGURE 4: SLEEP MODE APPLICATION WITH USB REMOTE WAKEUP ............ 30 FIGURE 5: SLEEP MODE APPLICATION WITH RI ..................
  • Page 10 LTE Module Series EC21 Hardware Design FIGURE 37: DIMENSIONS OF THE UF.L-R-SMT CONNECTOR (UNIT: MM) ..........66 FIGURE 38: MECHANICALS OF UF.L-LP CONNECTORS ................66 FIGURE 39: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ............67 FIGURE 40: MODULE TOP AND SIDE DIMENSIONS ..................81 FIGURE 41: MODULE BOTTOM DIMENSIONS (BOTTOM VIEW) ..............

  • Page 11: Introduction

    LTE Module Series EC21 Hardware Design Introduction This document defines the EC21 module and describes its air interface and hardware interface which are connected with your application. This document can help you quickly understand module interface specifications, electrical and mechanical details, as well as other related information of EC21 module. Associated with application note and user guide, you can use EC21 module to design and set up mobile applications easily.

  • Page 12: Safety Information

    EC21 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.

  • Page 13: Product Concept

    EC21 contains ten variants: EC21-E, EC21-A, EC21-V, EC21-AUT, EC21-AU, EC21-AUV, EC21-AUTL, EC21-J, EC21-CT and EC21-KL. You can choose a dedicated type based on the region or operator. The following table shows the frequency bands of EC21 series module. Table 1: Frequency Bands of EC21 Series Module...

  • Page 14: Key Features

    EC21 Hardware Design NOTES GNSS function is optional. EC21 series module (EC21-E, EC21-A, EC21-V, EC21-AUT, EC21-AU, EC21-AUV, EC21-AUTL, EC21-J, EC21-CT and EC21-KL) includes Data-only and Telematics versions. Data-only version does not support voice function, while Telematics version supports it. B2 band on EC21-AU module does not support Rx-diversity.
  • Page 15 LTE Module Series EC21 Hardware Design TDD: Max 3.1Mbps (UL), 8.96Mbps (DL) Support 3GPP R8 DC-HSPA+ Support 16-QAM, 64-QAM and QPSK modulation WCDMA Features 3GPP R6 CAT6 HSUPA: Max 5.76Mbps (UL) 3GPP R8 CAT24 DC-HSPA+: Max 42Mbps (DL) R99: CSD: 9.6kbps, 14.4kbps GPRS: Support GPRS multi-slot class 12 (12 by default) Coding scheme: CS-1, CS-2, CS-3 and CS-4...
  • Page 16 Bluetooth* Rx-diversity Support LTE/WCDMA Rx-diversity Gen8C Lite of Qualcomm GNSS Features Protocol: NMEA 0183 Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT AT Commands commands Two pins including NET_MODE and NET_STATUS to indicate network Network Indication connectivity status...

  • Page 17: Functional Diagram

    UART Figure 1: Functional Diagram 2.4. Evaluation Board In order to help you develop applications with EC21, Quectel supplies an evaluation board (EVB), USB data cable, earphone, antenna and other peripherals to control or test the module. EC21_Hardware_Design Confidential / Released...

  • Page 18: Application Interfaces

    LTE Module Series EC21 Hardware Design Application Interfaces 3.1. General Description EC21 is equipped with 80-pin SMT pads plus 64-pin ground pads and reserved pads that can be connected to cellular application platform. Sub-interfaces included in these pads are described in detail in the following chapters: ...

  • Page 19: Pin Assignment

    LTE Module Series EC21 Hardware Design 3.2. Pin Assignment The following figure shows the pin assignment of EC21 module. WAKEUP_IN AP_READY RESERVED W_DISABLE# NET_MODE NET_STATUS ANT_MAIN VDD_EXT RESERVED RESERVED RESERVED RESERVED ANT_GNSS USIM_GND ADC0 DBG_RXD ADC1 DBG_TXD RESERVED USIM_PRESENCE I2C_SDA USIM_VDD I2C_SCL USIM_DATA...

  • Page 20: Pin Description

    LTE Module Series EC21 Hardware Design module. Keep all RESERVED pins and unused pins unconnected. GND pads 85~112 should be connected to ground in the design, and RESERVED pads 73~84 should not be designed in schematic and PCB decal. ※ “...
  • Page 21 LTE Module Series EC21 Hardware Design Power supply for Provide 1.8V for Vnorm=1.8V external GPIO’s pull up VDD_EXT external circuit max=50mA circuits. 8, 9, 19, 22, 36, 46, 48, 50~54, Ground 56, 72, 85~112 Turn on/off Pin Name Pin No. Description DC Characteristics Comment...
  • Page 22 LTE Module Series EC21 Hardware Design USIM Interface Pin Name Pin No. Description DC Characteristics Comment Specified ground for USIM_GND USIM card For 1.8V USIM: Vmax=1.9V Vmin=1.7V Either 1.8V or 3.0V is Power supply for USIM_VDD supported by the USIM card For 3.0V USIM: module automatically.
  • Page 23 LTE Module Series EC21 Hardware Design UART Interface Pin Name Pin No. Description DC Characteristics Comment max=0.45V 1.8V power domain. Ring indicator min=1.35V If unused, keep it open. Data carrier max=0.45V 1.8V power domain. detection min=1.35V If unused, keep it open. max=0.45V 1.8V power domain.
  • Page 24 LTE Module Series EC21 Hardware Design PCM Interface Pin Name Pin No. Description DC Characteristics Comment min=-0.3V max=0.6V 1.8V power domain. PCM_IN PCM data input min=1.2V If unused, keep it open. max=2.0V max=0.45V 1.8V power domain. PCM_OUT PCM data output min=1.35V If unused, keep it open.
  • Page 25 LTE Module Series EC21 Hardware Design min=-0.3V 1.8V power domain. Ethernet PHY max=0.6V EPHY_INT_N If unused, keep it interrupt min=1.2V open. max=2.0V For 1.8V: max=0.45V min=1.4V max=0.58V 1.8V/2.85V power SGMII MDIO min=1.27V SGMII_ domain. (Management Data MDATA If unused, keep it Input/Output) data For 2.85V: open.
  • Page 26 LTE Module Series EC21 Hardware Design min=-0.3V open. max=0.6V min=1.2V max=2.0V max=0.45V min=1.35V 1.8V power domain. SDC1_ min=-0.3V SDIO data bus D2 If unused, keep it DATA2 max=0.6V open. min=1.2V max=2.0V max=0.45V min=1.35V 1.8V power domain. SDC1_ min=-0.3V SDIO data bus D1 If unused, keep it DATA1 max=0.6V...
  • Page 27 LTE Module Series EC21 Hardware Design 1.8V power domain. COEX_UART_ LTE/WLAN max=0.45V If unused, keep it coexistence signal min=1.35V open. WLAN_SLP_ If unused, keep it WLAN sleep clock open. min=-0.3V 1.8V power domain. BT UART request to max=0.6V BT_RTS* If unused, keep it send min=1.2V open.
  • Page 28 LTE Module Series EC21 Hardware Design control max=0.6V Pull-up by default. min=1.2V In low voltage level, max=2.0V module can enter into airplane mode. If unused, keep it open. min=-0.3V Application 1.8V power domain. max=0.6V AP_READY processor sleep If unused, keep it min=1.2V state detection open.

  • Page 29: Operating Modes

    LTE Module Series EC21 Hardware Design 3.4. Operating Modes The table below briefly summarizes the various operating modes referred in the following chapters. Table 5: Overview of Operating Modes Mode Details Software is active. The module has been registered on the network, and Idle it is ready to send and receive data.

  • Page 30: Usb Application With Usb Remote Wakeup Function

    LTE Module Series EC21 Hardware Design The following figure shows the connection between the module and the host. Host Module EINT GPIO GPIO AP_READY Figure 3: Sleep Mode Application via UART  Driving the host DTR to low level will wake up the module. ...

  • Page 31: Usb Application With Usb Suspend/Resume And Ri Function

    LTE Module Series EC21 Hardware Design The following figure shows the connection between the module and the host. Host Module USB_VBUS USB_DP USB_DP USB_DM USB_DM GPIO AP_READY Figure 4: Sleep Mode Application with USB Remote Wakeup  Sending data to EC21 through USB will wake up the module. ...

  • Page 32: Usb Application Without Usb Suspend Function

    LTE Module Series EC21 Hardware Design The following figure shows the connection between the module and the host. Module Host USB_VBUS USB_DP USB_DP USB_DM USB_DM GPIO AP_READY EINT Figure 5: Sleep Mode Application with RI  Sending data to EC21 through USB will wake up the module. ...

  • Page 33: Airplane Mode

    LTE Module Series EC21 Hardware Design Switching on the power switch to supply power to USB_VBUS will wake up the module. NOTE Please pay attention to the level match shown in dotted line between the module and the host. Refer to document [1] for more details about EC21 power management application.

  • Page 34: Decrease Voltage Drop

    LTE Module Series EC21 Hardware Design Table 6: VBAT and GND Pins Pin Name Pin No. Description Min. Typ. Max. Unit Power supply for module RF VBAT_RF 57, 58 part. Power supply for module VBAT_BB 59, 60 baseband part. 8, 9, 19, 22, 36, 46, 48, 50~54, Ground 56, 72, 85~112...

  • Page 35: Reference Design For Power Supply

    LTE Module Series EC21 Hardware Design VBAT VBAT_RF VBAT_BB 100nF 33pF 10pF 100uF 100nF 33pF 10pF 5.1V 100uF Module Figure 8: Star Structure of the Power Supply 3.6.3. Reference Design for Power Supply Power design for the module is very important, as the performance of the module largely depends on the power source.

  • Page 36: Monitor The Power Supply

    LTE Module Series EC21 Hardware Design 3.6.4. Monitor the Power Supply AT+CBC command can be used to monitor the VBAT_BB voltage value. For more details, please refer to document [2]. 3.7. Turn on and off Scenarios 3.7.1. Turn on Module Using the PWRKEY The following table shows the pin definition of PWRKEY.

  • Page 37: Figure 11: Turn On The Module Using Keystroke

    LTE Module Series EC21 Hardware Design PWRKEY Close to S1 Figure 11: Turn on the Module Using Keystroke The turn on scenario is illustrated in the following figure. NOTE VBAT ≥100ms ≥1.3V ≤0.5V PWRKEY RESET_N ≥2.5s STATUS (OD) ≥12s UART Inactive Active ≥13s...

  • Page 38: Turn Off Module

    LTE Module Series EC21 Hardware Design 3.7.2. Turn off Module The following procedures can be used to turn off the module:  Normal power down procedure: Turn off the module using the PWRKEY pin.  Normal power down procedure: Turn off the module using AT+QPOWD command. 3.7.2.1.

  • Page 39: Reset The Module

    LTE Module Series EC21 Hardware Design 3.8. Reset the Module The RESET_N pin can be used to reset the module. The module can be reset by driving RESET_N to a low level voltage for time between 150ms and 460ms. Table 8: RESET_N Pin Description Pin Name Pin No.

  • Page 40: Usim Card Interface

    LTE Module Series EC21 Hardware Design The reset scenario is illustrated in the following figure. VBAT ≤460ms ≥150ms ≥1.3V RESET_N ≤0.5V Module Running Resetting Restart Status Figure 16: Timing of Resetting Module NOTES Use RESET_N only when turning off the module by AT+QPOWD command and PWRKEY pin failed. Ensure that there is no large capacitance on PWRKEY and RESET_N pins.

  • Page 41: Figure 17: Reference Circuit Of Usim Card Interface With An 8-Pin Usim Card Connector

    LTE Module Series EC21 Hardware Design EC21 supports USIM card hot-plug via the USIM_PRESENCE pin. The function supports low level and high level detections, and is disabled by default. Please refer to document [2] about AT+QSIMDET command for details. The following figure shows a reference design for USIM card interface with an 8-pin USIM card connector. VDD_EXT USIM_VDD 100nF...

  • Page 42: Usb Interface

    LTE Module Series EC21 Hardware Design In order to enhance the reliability and availability of the USIM card in your application, please follow the criteria below in USIM circuit design:  Keep layout of USIM card as close to the module as possible. Keep the trace length as less than 200mm as possible.

  • Page 43: Figure 19: Reference Circuit Of Usb Application

    LTE Module Series EC21 Hardware Design The USB interface is recommended to be reserved for firmware upgrade in your design. The following figure shows a reference circuit of USB interface. Test Points Minimize these stubs Module NM_0R NM_0R ESD Array USB_VBUS USB_DM USB_DM...

  • Page 44: Uart Interfaces

    LTE Module Series EC21 Hardware Design 3.11. UART Interfaces The module provides two UART interfaces: the main UART interface and the debug UART interface. The following shows their features.  The main UART interface supports 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600 and 3000000bps baud rates, and the default is 115200bps.

  • Page 45: Table 13: Logic Levels Of Digital I/O

    LTE Module Series EC21 Hardware Design The logic levels are described in the following table. Table 13: Logic Levels of Digital I/O Parameter Min. Max. Unit -0.3 0.45 1.35 The module provides 1.8V UART interface. A level translator should be used if your application is equipped with a 3.3V UART interface.

  • Page 46: Pcm And I2C Interfaces

    LTE Module Series EC21 Hardware Design 4.7K VDD_EXT VDD_EXT Module MCU/ARM VDD_EXT VCC_MCU 4.7K GPIO EINT GPIO Figure 21: Reference Circuit with Transistor Circuit NOTE Transistor circuit solution is not suitable for applications with high baud rates exceeding 460Kbps. 3.12. PCM and I2C Interfaces EC21 provides one Pulse Code Modulation (PCM) digital interface for audio design, which supports the following modes: ...

  • Page 47: Table 14: Pin Definition Of Pcm And I2C Interfaces

    LTE Module Series EC21 Hardware Design 125us PCM_CLK PCM_SYNC PCM_OUT PCM_IN Figure 22: Primary Mode Timing 125us PCM_CLK PCM_SYNC PCM_OUT PCM_IN Figure 23: Auxiliary Mode Timing The following table shows the pin definition of PCM and I2C interfaces which can be applied on audio codec design.

  • Page 48: Figure 24: Reference Circuit Of Pcm Application With Audio Codec

    LTE Module Series EC21 Hardware Design PCM_CLK PCM data bit clock 1.8V power domain I2C_SCL I2C serial clock Require external pull-up to 1.8V I2C_SDA I2C serial data Require external pull-up to 1.8V Clock and mode can be configured by AT command, and the default configuration is master mode using short frame synchronization format with 2048kHz PCM_CLK and 8kHz PCM_SYNC.

  • Page 49: Adc Function

    LTE Module Series EC21 Hardware Design 3.13. ADC Function The module provides two analog-to-digital converters (ADC). AT+QADC=0 command can be used to read the voltage value on ADC0 pin. AT+QADC=1 command can be used to read the voltage value on ADC1 pin.

  • Page 50: Network Status Indication

    LTE Module Series EC21 Hardware Design 3.14. Network Status Indication The network indication pins can be used to drive network status indication LEDs. The module provides two pins which are NET_MODE and NET_STATUS. The following tables describe the pin definition and logic level changes in different network status.

  • Page 51: Status

    LTE Module Series EC21 Hardware Design VBAT Module 2.2K 4.7K Network Indicator Figure 25: Reference Circuit of the Network Indicator 3.15. STATUS The STATUS pin is an open drain output for indicating the module’s operation status. You can connect it to a GPIO of DTE with a pull up resistor, or as the LED indication circuit shown below.

  • Page 52: Behavior Of The Ri

    LTE Module Series EC21 Hardware Design 3.16. Behavior of the RI AT+QCFG=“risignaltype”,“physical” command can be used to configure RI behavior. No matter on which port URC is presented, URC will trigger the behavior of RI pin. NOTE URC can be output from UART port, USB AT port and USB modem port by AT+QURCCFG command. The default port is USB AT port.

  • Page 53: Table 21: Pin Definition Of The Sgmii Interface

    LTE Module Series EC21 Hardware Design Table 21: Pin Definition of the SGMII Interface Pin Name Pin No. Description Comment Control Signal Part EPHY_RST_N 119 Ethernet PHY reset 1.8V/2.85V power domain EPHY_INT_N Ethernet PHY interrupt 1.8V power domain SGMII MDIO (Management Data SGMII_MDATA 121 1.8V/2.85V power domain Input/Output) data...

  • Page 54: Figure 28: Reference Circuit Of Sgmii Interface With Phy Ar8033 Application

    LTE Module Series EC21 Hardware Design Module AR8033 VDD_EXT 1.5K USIM2_VDD EPHY_INT_N EPHY_RST_N RSTN Control SGMII_MDATA MDIO SGMII_MCLK USIM2_VDD USIM2_VDD Close to Module 0.1uF SGMII_RX_P 0.1uF SGMII_RX_M SGMII Data 0.1uF SGMII_TX_P 0.1uF SGMII_TX_M Close to AR8033 Figure 28: Reference Circuit of SGMII Interface with PHY AR8033 Application In order to enhance the reliability and availability in your application, please follow the criteria below in the Ethernet PHY circuit design: ...

  • Page 55: Wireless Connectivity Interfaces

    LTE Module Series EC21 Hardware Design 3.18. Wireless Connectivity Interfaces EC21 supports a low-power SDIO 3.0 interface for WLAN and a UART/PCM interface for BT. The following table shows the pin definition of wireless connectivity interfaces. Table 22: Pin Definition of Wireless Connectivity Interfaces Pin Name Pin No.

  • Page 56: Figure 29: Reference Circuit Of Wireless Connectivity Interfaces With Fc20 Module

    1. “*” means under development. Pads 24~27 are multiplexing pins used for audio design on EC21 module and BT function on FC20 module. The following figure shows a reference design of wireless connectivity interfaces with Quectel FC20 module. Module FC20 Module...

  • Page 57: Wlan Interface

    LTE Module Series EC21 Hardware Design NOTES FC20 module can only be used as a slave device, When BT function is enabled on EC21 module, PCM_SYNC and PCM_CLK pins are only used to output signals. For more information about wireless connectivity interfaces, please refer to document [5]. 3.18.1.

  • Page 58: Usb_Boot Interface

    LTE Module Series EC21 Hardware Design 3.19. USB_BOOT Interface EC21 provides a USB_BOOT pin. During development or factory production, USB_BOOT pin can force the module to boot from USB port for firmware upgrade. Table 23: Pin Definition of USB_BOOT Interface Pin Name Pin No.

  • Page 59: Gnss Receiver

    LTE Module Series EC21 Hardware Design GNSS Receiver 4.1. General Description EC21 includes a fully integrated global navigation satellite system solution that supports Gen8C-Lite of Qualcomm (GPS, GLONASS, BeiDou, Galileo and QZSS). EC21 supports standard NMEA-0183 protocol, and outputs NMEA sentences at 1Hz data update rate via USB interface by default.

  • Page 60: Layout Guidelines

    LTE Module Series EC21 Hardware Design Autonomous Hot start @open sky XTRA enabled Accuracy Autonomous CEP-50 <1.5 (GNSS) @open sky NOTES Tracking sensitivity: the lowest GNSS signal value at the antenna port on which the module can keep on positioning for 3 minutes. Reacquisition sensitivity: the lowest GNSS signal value at the antenna port on which the module can fix position again within 3 minutes after loss of lock.

  • Page 61: Antenna Interfaces

    LTE Module Series EC21 Hardware Design Antenna Interfaces EC21 antenna interfaces include a main antenna interface, an Rx-diversity antenna interface which is used to resist the fall of signals caused by high speed movement and multipath effect, and a GNSS antenna interface.

  • Page 62: Reference Design Of Rf Antenna Interface

    LTE Module Series EC21 Hardware Design 699~716 729~746 777~787 746~756 815~830 860~875 830~845 875~890 832~862 791~821 814~849 859~894 703~748 758~803 2300~2400 2300~2400 5.1.3. Reference Design of RF Antenna Interface A reference design of ANT_MAIN and ANT_DIV antenna pads is shown as below. It should reserve a π-type matching circuit for better RF performance.

  • Page 63: Reference Design Of Rf Layout

    LTE Module Series EC21 Hardware Design 5.1.4. 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).

  • Page 64: Figure 34: Coplanar Waveguide Line Design On A 4-Layer Pcb (Layer 3 As Reference Ground)

    LTE Module Series EC21 Hardware Design Figure 34: Coplanar Waveguide Line Design on a 4-layer PCB (Layer 3 as Reference Ground) Figure 35: 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: ...

  • Page 65: Gnss Antenna Interface

    LTE Module Series EC21 Hardware Design 5.2. GNSS Antenna Interface The following tables show the pin definition and frequency specification of GNSS antenna interface. Table 27: Pin Definition of GNSS Antenna Interface Pin Name Pin No. Description Comment ANT_GNSS GNSS antenna 50 ohm impedance Table 28: GNSS Frequency Type...

  • Page 66: Antenna Installation

    LTE Module Series EC21 Hardware Design 5.3. Antenna Installation 5.3.1. Antenna Requirement The following table shows the requirements on main antenna, Rx-diversity antenna and GNSS antenna. Table 29: Antenna Requirements Type Requirements Frequency range: 1561~1615MHz Polarization: RHCP or linear VSWR: <2 (Typ.) Passive antenna gain: >0dBi GNSS Active antenna noise figure: <1.5dB...

  • Page 67: Recommended Rf Connector For Antenna Installation

    LTE Module Series EC21 Hardware Design 5.3.2. Recommended RF Connector for Antenna Installation If RF connector is used for antenna connection, it is recommended to use UF.L-R-SMT connector provided by HIROSE. Figure 37: Dimensions of the UF.L-R-SMT Connector (Unit: mm) U.FL-LP serial connectors listed in the following figure can be used to match the UF.L-R-SMT.

  • Page 68: Figure 39: Space Factor Of Mated Connector (Unit: Mm)

    LTE Module Series EC21 Hardware Design The following figure describes the space factor of mated connector. Figure 39: Space Factor of Mated Connector (Unit: mm) For more details, please visit http://www.hirose.com. EC21_Hardware_Design Confidential / Released 67 / 94...

  • Page 69: Electrical, Reliability And Radio Characteristics

    LTE Module Series EC21 Hardware Design Electrical, Reliability and Radio Characteristics 6.1. 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 30: Absolute Maximum Ratings Parameter Min.

  • Page 70: Operating Temperature

    LTE Module Series EC21 Hardware Design VBAT_RF min/max values, including voltage drop, ripple and spikes. Voltage drop during Maximum power control burst transmission level on GSM900 Peak supply current Maximum power control (during transmission VBAT level on GSM900 slot) USB_VBUS USB detection 5.25 6.3.

  • Page 71: Current Consumption

    LTE Module Series EC21 Hardware Design 6.4. Current Consumption The values of current consumption are shown below. Table 33: EC21-A Current Consumption Parameter Description Conditions Typ. Unit OFF state Power down AT+CFUN=0 (USB disconnected) WCDMA PF=64 (USB disconnected) Sleep state WCDMA PF=128 (USB disconnected) LTE-FDD PF=64 (USB disconnected) LTE-FDD PF=128 (USB disconnected)

  • Page 72: Table 34: Ec21-Aut Current Consumption

    LTE Module Series EC21 Hardware Design WCDMA B4 @23.36dBm 594.0 WCDMA B5 @23.64dBm 522.0 Table 34: EC21-AUT Current Consumption Parameter Description Conditions Typ. Unit OFF state Power down AT+CFUN=0 (USB disconnected) 0.99 WCDMA PF=64 (USB disconnected) Sleep state WCDMA PF=128 (USB disconnected) LTE-FDD PF=64 (USB disconnected) LTE-FDD PF=128 (USB disconnected) WCDMA PF=64 (USB disconnected)

  • Page 73: Table 35: Ec21-E Current Consumption

    LTE Module Series EC21 Hardware Design Table 35: EC21-E Current Consumption Parameter Description Conditions Typ. Unit OFF state Power down AT+CFUN=0 (USB disconnected) WCDMA PF=64 (USB disconnected) Sleep state WCDMA PF=128 (USB disconnected) FDD-LTE PF=64 (USB disconnected) FDD-LTE PF=128 (USB disconnected) WCDMA PF=64 (USB disconnected) WCDMA PF=64 (USB connected) Idle state...

  • Page 74: Table 36: Ec21-Kl Current Consumption

    LTE Module Series EC21 Hardware Design DCS1800 1DL/4UL @25dBm WCDMA B1 HSDPA @22.5dBm WCDMA B1 HSUPA @21.11dBm WCDMA B5 HSDPA @23.5dBm WCDMA data transfer (GNSS OFF) WCDMA B5 HSUPA @21.4dBm WCDMA B8 HSDPA @22.41dBm WCDMA B8 HSUPA @21.2dBm LTE-FDD B1 @23.45dBm LTE-FDD B3 @23.4dBm LTE-FDD B5 @23.4dBm LTE data transfer...

  • Page 75: Table 37: Ec21-V Current Consumption

    LTE Module Series EC21 Hardware Design LTE-FDD B1 @23.65dBm 765.0 LTE-FDD B3 @23.2dBm 825.0 LTE data transfer LTE-FDD B5 @23.2dBm 598.0 (GNSS OFF) LTE-FDD B7 @23.7dBm 762.0 LTE-FDD B8 @23.1dBm 569.0 Table 37: EC21-V Current Consumption Parameter Description Conditions Typ. Unit OFF state Power down...

  • Page 76: Table 39: Gnss Current Consumption Of Ec21 Series Module

    790.0 WCDMA B1 @22.72dBm 640.0 WCDMA voice call WCDMA B5 @23.19dBm 638.0 WCDMA B8 @23.27dBm 626.0 Table 39: GNSS Current Consumption of EC21 Series Module Parameter Description Conditions Typ. Unit Cold start @Passive Antenna Searching (AT+CFUN=0) Lost state @Passive Antenna...

  • Page 77: Rf Output Power

    In GPRS 4 slots TX mode, the maximum output power is reduced by 3.0dB. The design conforms to the GSM specification as described in Chapter 13.16 of 3GPP TS 51.010-1. 6.6. RF Receiving Sensitivity The following tables show the conducted RF receiving sensitivity of EC21 series module. Table 41: EC21-E Conducted RF Receiving Sensitivity Frequency...

  • Page 78: Table 42: Ec21-A Conducted Rf Receiving Sensitivity

    LTE Module Series EC21 Hardware Design WCDMA Band 8 -110.5dBm -103.7dBm LTE-FDD B1 (10M) -98.0dBm -98.0dBm -101.5dBm -96.3dBm LTE-FDD B3 (10M) -96.5dBm -98.5dBm -101.5dBm -93.3dBm LTE-FDD B5 (10M) -98.0dBm -98.5dBm -101.0dBm -94.3dBm LTE-FDD B7 (10M) -97.0dBm -94.5dBm -99.5dBm -94.3dBm LTE-FDD B8 (10M) -97.0dBm -97.0dBm -101.0dBm...

  • Page 79: Table 45: Ec21-Autl Conducted Rf Receiving Sensitivity

    LTE Module Series EC21 Hardware Design WCDMA B5 -110.5dBm -104.7dBm LTE-FDD B1 (10M) 98.5dBm -98.0dBm -101.0dBm -96.3dBm LTE-FDD B3 (10M) -98.0dBm -96.0dBm -100.0dBm -93.3dBm LTE-FDD B5 (10M) -98.0dBm -99.0dBm -102.5dBm -94.3dBm LTE-FDD B7 (10M) -97.0dBm -95.0dBm -98.5dBm -94.3dBm LTE-FDD B28 (10M) -97.0dBm -99.0dBm -102.0dBm...

  • Page 80: Table 48: Ec21-J Conducted Rf Receiving Sensitivity

    LTE Module Series EC21 Hardware Design LTE-FDD B5* (10M) Table 48: EC21-J Conducted RF Receiving Sensitivity Frequency Primary Diversity SIMO 3GPP (SIMO) LTE-FDD B1 (10M) -97.5dBm -98.7dBm -100.2dBm -96.3dBm LTE-FDD B3 (10M) -96.5dBm -97.1dBm -100.5dBm -93.3dBm LTE-FDD B8 (10M) -98.4dBm -99.0dBm -101.2dBm -93.3dBm...

  • Page 81: Electrostatic Discharge

    LTE Module Series EC21 Hardware Design 6.7. Electrostatic Discharge The module is not protected against electrostatic discharge (ESD) in general. Consequently, it is subject to ESD handling precautions that typically apply to ESD sensitive components. Proper ESD handling and packaging procedures must be applied throughout the processing, handling and operation of any application that incorporates the module.

  • Page 82: Mechanical Dimensions

    LTE Module Series EC21 Hardware Design Mechanical Dimensions This chapter describes the mechanical dimensions of the module. All dimensions are measured in mm. 7.1. Mechanical Dimensions of the Module (32+/-0.15) 2.4+/-0.2 Figure 40: Module Top and Side Dimensions EC21_Hardware_Design Confidential / Released 81 / 94...

  • Page 83: Figure 41: Module Bottom Dimensions (Bottom View)

    LTE Module Series EC21 Hardware Design 32.0 1.30 3.85 1.90 3.35 1.30 5.96 0.82 1.15 2.15 4.88 1.10 1.05 1.10 6.75 2.49 3.45 Figure 41: Module Bottom Dimensions (Bottom View) EC21_Hardware_Design Confidential / Released 82 / 94...

  • Page 84: Recommended Footprint

    LTE Module Series EC21 Hardware Design 7.2. Recommended Footprint 24.70 3.85 3.45 1.90 1.10 2.00 2.00 2.00 4.80 1.80 1.80 3.00 0.50 4.80 0.50 2.80 Keepout area 0.50 4.80 0.50 4.80 3.20 3.40 3.20 3.20 3.40 2.50 1.90 1.00 0.80 1.30 32.0 Figure 42: Recommended Footprint (Top View)

  • Page 85: Design Effect Drawings Of The Module

    Figure 43: Top View of the Module Figure 44: Bottom View of the Module NOTE These are design effect drawings of EC21 module. For more accurate pictures, please refer to the module that you get from Quectel. EC21_Hardware_Design Confidential / Released 84 / 94...

  • Page 86: Storage, Manufacturing And Packaging

    LTE Module Series EC21 Hardware Design Storage, Manufacturing and Packaging 8.1. Storage EC21 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 <40º C/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: ...

  • Page 87: Manufacturing And Soldering

    LTE Module Series EC21 Hardware Design 8.2. 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.

  • Page 88: Packaging

    LTE Module Series EC21 Hardware Design 8.3. Packaging EC21 is packaged in tape and reel carriers. One reel is 11.53m long and contains 250pcs modules. The figure below shows the packaging details, measured in mm. 44.00 ±0.1 0.35±0.05 ±0.1 2.00 ±0.1 4.00 ±0.15...

  • Page 89: Appendix A References

    LTE Module Series EC21 Hardware Design Appendix A References Table 51: Related Documents Document Name Remark EC21 Power Management Application Quectel_EC21_Power_Management_Application_Note Note Quectel_EC25&EC21_AT_Commands_Manual EC25 and EC21 AT Commands Manual EC25 and EC21 GNSS AT Commands Quectel_EC25&EC21_GNSS_AT_Commands_Manual Manual Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide Quectel_EC21_Reference_Design EC21 Reference Design Quectel_RF_Layout_Application_Note...
  • Page 90 LTE Module Series EC21 Hardware Design Downlink Data Terminal Ready Discontinuous Transmission Enhanced Full Rate Electrostatic Discharge Frequency Division Duplex Full Rate GLObalnaya NAvigatsionnaya Sputnikovaya Sistema, the Russian Global GLONASS Navigation Satellite System GMSK Gaussian Minimum Shift Keying GNSS Global Navigation Satellite System Global Positioning System Global System for Mobile Communications Half Rate...
  • Page 91 LTE Module Series EC21 Hardware Design Password Authentication Protocol Printed Circuit Board Protocol Data Unit Point-to-Point Protocol Quadrature Amplitude Modulation QPSK Quadrature Phase Shift Keying Radio Frequency RHCP Right Hand Circularly Polarized Receive SGMII Serial Gigabit Media Independent Interface Subscriber Identification Module SIMO Single Input Multiple Output Short Message Service...
  • Page 92 LTE Module Series EC21 Hardware Design Minimum Input High Level Voltage Value Maximum Input Low Level Voltage Value Minimum Input Low Level Voltage Value Absolute Maximum Input Voltage Value Absolute Minimum Input Voltage Value Maximum Output High Level Voltage Value Minimum Output High Level Voltage Value Maximum Output Low Level Voltage Value Minimum Output Low Level Voltage Value...

  • Page 93: Appendix B Gprs Coding Schemes

    LTE Module Series EC21 Hardware Design Appendix B GPRS Coding Schemes Table 53: Description of Different Coding Schemes Scheme CS-1 CS-2 CS-3 CS-4 Code Rate Pre-coded USF Radio Block excl. USF and BCS Tail Coded Bits Punctured Bits Data Rate Kb/s 9.05 13.4 15.6...

  • Page 94: Appendix C Gprs Multi-Slot Classes

    LTE Module Series EC21 Hardware Design 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.

  • Page 95: Appendix D Edge Modulation And Coding Schemes

    LTE Module Sires EC21 Hardware Design Appendix D EDGE Modulation and Coding Schemes Table 55: EDGE Modulation and Coding Schemes Coding Scheme Modulation Coding Family 1 Timeslot 2 Timeslot 4 Timeslot CS-1: GMSK 9.05kbps 18.1kbps 36.2kbps CS-2: GMSK 13.4kbps 26.8kbps 53.6kbps CS-3: GMSK...

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