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Cavli Wireless C20QM Hardware Manual

Lte cat 4 /2g module
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Cavli C20QM
LTE CAT 4 /2G Module
Hardware Manual
External Release Version 2.2
www.cavliwireless.com
www.cavliwireless.com
C 20QM Hardware Manual
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Summary of Contents for Cavli Wireless C20QM

  • Page 1 C 20QM Hardware Manual Cavli C20QM LTE CAT 4 /2G Module Hardware Manual External Release Version 2.2 www.cavliwireless.com www.cavliwireless.com...
  • Page 2 COPYRIGHT THE INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF CAVLI WIRELESS INC. 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.

  • Page 3: Table Of Contents

    2.3 Module Function ......................... 14 3 Interface Application Description ....................16 3.1 C hapter Overview ........................16 3.2 Module Interface ........................17 3.2.1 C20QM Pin Layout ..................................... 17 3.2.2 C20QM Pin Interface ....................................18 3.2.3 Absolute maximum ratings ................................19 3.2.4 Operating Conditions .................................... 19 3.2.5 Pin Descriptions ......................................
  • Page 4 C 20QM Hardware Manual 3.6.2 UART4 Serial Port (AT UART) ..............................39 3.6.3 UART5 Serial Port (Debug UART) ............................39 3.6.5 Serial Port Application Circuit ..............................40 3.7 uSIM Interface ..........................41 3.7.1 uSIM Card Reference Circuit ................................41 3.8 G eneral Purpose G PIO Interface ..................42 3.9 Network Status Indication Interface ..................
  • Page 5 C 20QM Hardware Manual 5 Interface Electrical C haracteristics ..................65 5.1 C hapter Overview ........................65 5.2 W orking Storage Temperature .................... 65 5.3 Electrostatic Property ......................65 5.4 Module IO Level ......................... 66 5.5 Power Supply ..........................67 5.6 Power C onsumption C haracteristics .................. 67 6 Structural and Mechanical Properties ..................69 6.1 C 20QM module mechanical size...................
  • Page 6 C 20QM Hardware Manual Table of Figures Figure 1 C20QM Functional Block Diagram ......................15 Figure 2 C20QM module Interface definition (Top view) ..................17 Figure 3 VCC Power Supply ............................33 Figure 4 DC Switching Power Supply Reference Circuit ..................34 Figure 5 Power-on Reference Circuit ........................
  • Page 7 C 20QM Hardware Manual Figure 32 Reflow Soldering Temperature Graph ....................74 www.cavliwireless.com...

  • Page 8: Version History

    C 20QM Hardware Manual VERSION HISTORY Version Edit Release Date • Initial Version 16-08-2023 • Updated reference circuits o VCC Power Supply o DC Switching Power Supply Reference Circuit o Power-on Reference Circuit o Reset Reference Circuit o USIM Design Circuit Diagram o Circuit Diagram of Network Indicator o I2C Interface Reference Circuit Diagram 29-09-2023...
  • Page 9 C 20QM Hardware Manual • Updated power consumption details and GNSS 08-05-2024 performance details • Updated the power consumption 21-08-2024 characteristics • Updated module information 29-08-2024 • Updated band list 11-12-2024 • Updated band list 03-01-2025 www.cavliwireless.com...

  • Page 10: Introduction

    C 20QM Hardware Manual Introduction This document is the Hardware Manual of the Cavli Wireless solution product C20QM Module, which describes: ✓ The hardware composition and functional features of the module ✓ The definition and usage of the application interface The electrical performance and mechanical properties of the module ✓...

  • Page 11: Module Overview

    4G LTE feature phone solution. The C20QM communication subsystem integrates LTE CAT 4 technology, GSM Modem Baseband, and an RF transceiver to cover bands B2 /B4 /B5 /B12 /B13 /B17 /B25 /B66 /GSM 900/ GSM 1800 (N.A), B1 / B3 /B5 /B7 /B8 /B18 /B19 /B20 /B26 /B28 /B38 /B40 /B41 /GSM 900/ GSM 1800 (EAJ), B1/ B3/ B7/ B8/ B20/ B28 /GSM 900/ GSM 1800 (E.U) , B1/ B3/ B5/ B8/ B40/ B41/ GSM 900/ GSM 1800 (I.N), B1/ B3/ B5/ B8/...

  • Page 12: Module C Haracteristics

    C 20QM Hardware Manual 2.2 Module C haracteristics Table 2.1 Key Features Characteristics Description Physical Characteristics 37mm x 21.8mm x 2.8mm Fixed Way LGA package, patch mount Operating Voltage 3.4V – 4.5V Typical Voltage 3.8 V Application Processor ARM Cortex A7 with 1.3GHz clock with 256KB L2 Cache Operating System Linux 4.14 Memory...
  • Page 13 C 20QM Hardware Manual ✓ 2 ADC lines Network ✓ WWAN_STATE network status indication Indication ✓ STATUS Module status GPIO ✓ 9 GPIO Interfaces ✓ 1 MIPI_DBI LCD interface GNSS ✓ GPS, GLONASS, BEIDOU, GALILEO, QZSS ✓ Standard SPI interface Ethernet ✓...

  • Page 14: Module Function

    NOTE • When the temperature is in the range of –30°C to –20°C or +75°C to +85°C, some RF specifications of the C20QM module may not meet the 3GPP standards. 2.3 Module Function C20QM Module mainly consists of the following circuit units: ✓...

  • Page 15: Figure 1 C20Qm Functional Block Diagram

    C 20QM Hardware Manual ✓ Interfaces The functional block diagram of C20QM module is shown below： Figure 1 C20QM Functional Block Diagram 2.4 Module W orking Mode Table 2.2 Working Mode Working Mode Description Turn off the machine In the case of shutdown, the module is fully powered off.

  • Page 16: Interface Application Description

    C 20QM Hardware Manual Interface Application Description 3.1 C hapter Overview This chapter mainly describes the interface definition and application of this module. It contains the following sections: • Module Interface • Power Interface • Switching Machine Reset Mode • USB Interface •...

  • Page 17: Module Interface

    C 20QM Hardware Manual 3.2 Module Interface 3.2.1 C20QM Pin Layout C20QM pins (Top View) are assigned as follows： Figure 2 C20QM module Interface definition (Top view) NOTE • All RESERVED and unused pin feet need to be left floating...

  • Page 18: C20Qm Pin Interface

    C 20QM Hardware Manual 3.2.2 C20QM Pin Interface The C20QM module has the LGA interface. The module interface definition is shown in the following table: Table 3.1 Pin Description Pin Type Description PAD TYPE Analog Input Analog Output Bidirectional digital with CMOS input...

  • Page 19: Absolute Maximum Ratings

    C 20QM Hardware Manual 3.2.3 Absolute maximum ratings The absolute maximum ratings table reflects the stress levels that, if exceeded, may cause permanent damage to the device. No functionality is guaranteed outside the operating specifications. Functionality and reliability are only guaranteed within the operating conditions described in Operating conditions. Table 3.2 Absolute Maximum ratings Pin Type V_min...

  • Page 20: Pin Descriptions

    C 20QM Hardware Manual 3.2.5 Pin Descriptions Table 3.4 Pin Name Voltage Configurable Pin Name Pin Description Comments Definition Type Functions Ground Pin Ground Pin 50Ω ANT_MAIN Main Antenna impedance Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin RESERVED Do not connect Ground Pin...
  • Page 21 C 20QM Hardware Manual Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Diversity 50 Ω ANT_DIV Antenna impedance Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin 50Ω GNSS_L1 GNSS Antenna impedance Ground Pin Ground Pin Ground Pin Module input VCC1 power supply...
  • Page 22 C 20QM Hardware Manual RESERVED Do not connect Ground Pin Ground Pin GPIO_79 Pin should PCM data frame not be high PCM_SYNC synchronization before signal completing bootup. GPIO_76 PCM_DIN PCM data input SPI3_CS1_N GPIO_77 PCM data PCM_DOUT SPI2_CS1_N output GPIO_78 Pin should SPI1_CLK not be high...
  • Page 23 C 20QM Hardware Manual SPI3_CS2_N Configurable I/O GPIO_52 Hardware Active low interrupt to WAKEUP_IN input for wake up from 500ms sleep RESERVED Do not connect RESERVED Do not connect RESERVED Do not connect RESERVED Do not connect GPIO_1 UART3 UART3_RX SPI3_MISO reception GPIO_0...
  • Page 24 C 20QM Hardware Manual SDIO bus pull up SDH_PWR_EN power Ground Pin Ground Pin RESERVED Do not connect RESERVED Do not connect GPIO_26 Default SD_CARD_DET_ SD CARD SPI3_CS2_N pullup to Insertion detect RESERVED Do not connect GPIO_3 UART3 Request UART3_RTS SPI3_CLK to send I2C3_SCL...
  • Page 25 C 20QM Hardware Manual Ground Pin Ground Pin GPIO_27 SGMII MDIO MDIO_CLK Clock GPIO_30 Ethernet PHY EPHY_INT_N interrupt GPIO_28 SGMII MDIO MDIO_DATA data GPIO_29 Ethernet PHY EPHY_RST_N reset SGMII reception SGMII_RX_N WLAN_EN GPIO_38 WLAN enable SGMII reception SGMII_RX_P GPIO_75 Codec CODEC_INT Initialization SGMII...
  • Page 26 C 20QM Hardware Manual RESERVED Do not connect RESERVED Do not connect RESERVED Do not connect Module status Outputs STATUS indication Pin High signal RESERVED Do not connect GPIO_41 Hardware Active low FLIGHT interrupt for input for Flight mode 500ms GPIO_37 Pin should not be high...
  • Page 27 C 20QM Hardware Manual GPIO_11 UART5_RTS I2C_SCL I2C clock signal SPI5_CLK SPI2_CS2_N GPIO_10 I2C_SDA UART5_CTS_N I2C data signal SPI5_CS_N ADC1 Generic ADC RESERVED Do not connect ADC2 Generic ADC RESERVED Do not connect USIM card UIM1_POWER power supply UIM1_DATA GPIO_31 USIM Data UIMI_CLK GPIO_32...
  • Page 28 C 20QM Hardware Manual JTAG Clock JTAG_TCK Input JTAG Mode JTAG_TMS select input JTAG_TDI JTAG Data input JTAG Data JTAG_TDO output MDM_JTAG_SR JTAG Reset for ST_N debug MDM_JTAG_TR JTAG Reset ST_N RESERVED Do not connect RESERVED Do not connect RESERVED Do not connect RESERVED Do not connect...
  • Page 29 C 20QM Hardware Manual SDC2_DATA_2 SDIO Bus data 2 SDC2_DATA_3 SDIO Bus data 3 Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin...
  • Page 30 C 20QM Hardware Manual Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin Ground Pin...
  • Page 31 C 20QM Hardware Manual GPIO_18 UART4_CTS_N LCD_TE_B LCD Tear effect SPI4_CS_N I2C4_SDA GPIO_23 LCD_CS LCD Chip Select UART6_RTS_N GPIO_22 UART6_CTS_N LCD_DS LCD Data Select SPI6_CS_N I2C6_SDA Module Output VREG_L11_1P8 Voltage RESERVED Do not connect RESERVED Do not connect RESERVED Do not connect LCD_RESET_N GPIO_74 Reset LCD...

  • Page 32: Power Interface

    ✓ VCC1, VCC2, VCC3, VCC4, VCC5 and VCC6 are the module working power supply. ✓ UIM1_POWER is the working power supply for SIM card. ✓ VREG_OUT_1V8 3.3.1 Power Supply Design The power interface of the C20QM module is as follows: Table 3.5 Power Pin Definitions Power supply Definition...

  • Page 33: Power Reference Circuit

    1.8V voltage The C20QM module is powered by a single power supply and the module provides six power supply pins. The power supply range is from 3.4V to 4.5V. It is recommended to use 3.8V power supply. If the module's operating voltage drop causes the VCC supply voltage to be too low or the supply current is insufficient, the module may shut down or restart.

  • Page 34: Vref 1.8 Voltage Output

    Minimize the equivalent impedance of the VCC trace 3.3.3 VREF 1.8 Voltage Output The C20QM module outputs 1.8V through VREF for internal digital circuitry. This voltage is the logic level voltage of the module. After normal power-on, the 146 pin will output 1.8V and the current load will be...

  • Page 35: Switching Machine Reset Mode

    3.4.2 Reset Control The Pin 145 of C20QM module Pin is the Reset pin. The application detects that the module is abnormal. When the software does not respond, the module can be reset. Pull the pin low for 100-600ms to reset the module.

  • Page 36: U Sb Interface

    VBAT RESET_IN Module Reset Control The C20QM module supports AT command reset, and the AT command is AT+TRB to restart the module. Detailed instructions can be found in the C20QM AT Command Set Manual. 3.5 U SB Interface The C20QM module USB interface supports USB2.0 high-speed protocol. The USB interface work as OTG host, therefore it can work as Host and Slave mode and does not support USB charging mode.

  • Page 37: Figure 7 Usb Connection Design Circuit Diagram With Id Pulled Up

    C 20QM Hardware Manual USB_ID USB ID detect USB_DM USB differential signal - The module only acts as a USB slave device and supports USB Sleep and Wake-Up mechanisms. USB interface application reference circuit is as follow: Figure 7 USB connection design circuit diagram with ID Pulled up Figure 8 USB connection design circuit diagram with ID Pulled down www.cavliwireless.com...

  • Page 38: U Art Interface

    4 Mbps. 3.6.1 UART3 Serial Port The pins 64, 65, 80 and 81 of the C20QM module are UART3 serial port pins. UART3 serial interface can be used to interact with peripheral devices. The pins are defined as follows：...

  • Page 39: Uart4 Serial Port (At Uart)

    C 20QM Hardware Manual UART3_CTS Clear to Send 3.6.2 UART4 Serial Port (AT UART) The pins 106 and 107 of the module are UART4 serial port pins. UART4 serial interface is configured as the AT port. Users can use this UART port for communication using AT commands. The default baud rate is 115200 bps.

  • Page 40: Serial Port Application Circuit

    C 20QM Hardware Manual 0.45 1.8V Data voltage transmission domain 3.6.5 Serial Port Application Circuit The serial level is 1.8V. The module's serial port baud rate can be set to 4800 to 921600bps baud rate and the default is 115200bps. To use a 2-wire serial port, User may refer to the following serial port design: Figure 9 UART Serial Port Design The serial port of the module is TTL 1.8V level.

  • Page 41: Usim Interface

    Sim Select 3.7.1 uSIM Card Reference Circuit The C20QM module does not come with a uSIM card slot. Users need to design a USIM card slot on their own interface board. The USIM card interface reference circuit is as follows: Figure 11 USIM Design Circuit Diagram www.cavliwireless.com...

  • Page 42: G Eneral Purpose G Pio Interface

    The ground of the USIM deck and the ground of the module should maintain good connectivity. 3.8 G eneral Purpose G PIO Interface The C20QM module contains nine general purpose control signals. The interface is defined as follows: Table 3.14 General GPIO Pin Definitions Pin No.

  • Page 43: Network Status Indication Interface

    C 20QM Hardware Manual GPIO_47 General Purpose Pin 47 GPIO_52 General Purpose Pin 52 GPIO_157 General Purpose Pin 157 GPIO_158 General Purpose Pin 158 3.9 Network Status Indication Interface The C10GS module provides one GPIO pins to indicate module status. Table 3.15 Definition of Network Indicator Lamp Pin No.

  • Page 44: Pc M Digital Voice Interface

    The brightness of the network indicator can be adjusted by adjusting the current limiting resistor 3.10 PC M digital voice interface C20QM module provides a set of PCM audio interfaces supporting 8-bit A-rate, U-rate and 16-bit linear short frame encoding formats with PCM_SYNC of 8 kHz and PCM_CLK of 2048 kHz.

  • Page 45: Figure 13 Pcm Short Frame Mode Timing Diagram

    C 20QM Hardware Manual PCM_SYNC PCM frame sync signal 0.45 PCM_CLK PCM clock pulse 0.45 CODEC_INT Figure 13 PCM Short Frame Mode Timing Diagram Table 3.18 PCM Specific Parameters Characteristic Description Encoding format Linear Data bit 16bits Master-slave mode Master/slave mode PCM clock 2048kHz PCM frame synchronization...

  • Page 46: I2C Bus

    Figure 14 PCM to Analog Voice Map 3.11 I2C Bus The C20QM module provides a set of hardware bidirectional serial buses with an I2C interface of 1.8V level, a 5.0 Protocol interface, and a clock rate of 400 KHz. Table 3.19 I2C Pin Definition...

  • Page 47: Sd Host Interface

    Figure 15 I2C Interface Reference Circuit Diagram 3.12 SD Host Interface C20QM module provides a set of 4-bit SD / MMC interfaces, supports SD3.0 protocol, supports two voltage SD cards of 1.8V / 2.95V, clock frequency up to 50MHz, maximum capacity supports 32GB. Provide VREF voltage for SDIO power supply.

  • Page 48: Sdc Interface

    3.13 SDC Interface C20QM module provides a set of 4-bit SDC interface, supports SD3.0 protocol, supports two voltage SD cards of 1.8V / 2.95V, clock frequency up to 50MHz, maximum capacity supports 32GB. Provide VREF voltage for SDIO power supply.

  • Page 49: Figure 16 Sdc Interface Reference Circuit Diagram

    C 20QM Hardware Manual Table 3.21 SDC Interface Pin Definitions Pin No. Pin name Definition SDC2_D0 SD card SDIO bus DATA0 SDC2_D1 SD card SDIO bus DATA1 SDC2_D2 SD card SDIO bus DATA2 SDC2_D3 SD card SDIO bus DATA3 SDC2_CLK SD card SDIO bus clock SDC2_CMD SD card SDIO bus command...

  • Page 50: Antenna

    50Ω characteristic impedance The pin-3 of the C20QM is the main antenna interface and pin-27 is the Diversity antenna interface. To facilitate the debugging of the antenna, a π-type matching circuit needs to be added to the main board, and a 50-ohm impedance line is taken.

  • Page 51: Figure 18 Diversity Antenna Matching Circuit

    Figure 18 Diversity antenna matching circuit The pin 33 of C20QM is the GNSS antenna interface. The C20QM has a dedicated antenna L1, it supports GPS, GLONASS, BEIDOU, QZSS, Galileo. QZSS and SBAS Ranging support available. In order to facilitate antenna debugging, a π-type matching circuit needs to be added to the motherboard and a 50-ohm impedance line is used.

  • Page 52: Figure 19 Gnss Active Antenna Matching Circuit

    C 20QM Hardware Manual Figure 19 GNSS Active Antenna Matching Circuit Figure 19 GNSS passive antenna matching circuit Figure 20 GNSS Passive Antenna Matching Circuit NOTE • An external LDO can be selected to supply power according to the active antenna requirement. •...

  • Page 53: Rf Trace Reference

    3.14.1 RF Trace Reference The main set of the C20QM module are extracted by pad. The antenna pad to the antenna feed point must use microstrip lines or other types of RF traces. The characteristic impedance of the signal line should be controlled at 50Ω.

  • Page 54: C Ontrol Interface

    C 20QM Hardware Manual Figure 23 The Complete Structure of the Multilayer PCB Strip Line NOTE • Since Coplanar antennas are having maximum noise immunity, it is preferred. 3.15 C ontrol Interface Different module interfaces are available in module. Table 3.23 Control Interface Pin Definition Pin No.

  • Page 55: Sg Mii Interface

    C 20QM Hardware Manual 3.16 SG MII Interface The SGMII interface is a serial interface featuring a low pin count that can be configured for ethernet Table 3.24 SGMII Interface Pin Definition Pin No. Signal name Description MDIO_CLK Management Data clock reference EPHY_INT_N Ethernet PHY Interrupt MDIO_DATA...

  • Page 56: G Nss Interface

    C 20QM Hardware Manual 3.17 G NSS Interface Multi – GNSS receiver: ✓ L1 multi-band GNSS receiver ✓ Multi-Constellation GPS/GLONASS/Galileo/Bei Dou/QZSS. Table 3.25 GNSS Antenna Pin Definition Signal name Pin No. Description GNSS_L1 GNSS L1 antenna interface 3.18 JTAG Interface The JTAG interface is used to troubleshoot the device and evaluate its functionality.

  • Page 57: Spi Interface

    C 20QM Hardware Manual 3.19 SPI interface C20QM supports an SPI interface which is master only. It communicates between module and peripherals through synchronous full duplex. The max clock rate is 50 MHz. Table 3.27 SPI Interface Pin Definition Pin No.

  • Page 58: Adc Interface

    C 20QM Hardware Manual 3.20 ADC interface ADC interface converts the analog signals to digital signals which can be understood by the device. The module provides 2 Analog to Digital Converter interface. Table 3.29 ADC Interface Pin Definition Pin No. Signal name Description ADC 1...

  • Page 59: Figure 26 Lcd (Dbi) Interface Reference Circuit Diagram

    C 20QM Hardware Manual LCD_OE_N LCD Output Enable LCD_RS LCD Register Select LCD_WE_N LCD Write Enable LCD_D_3 LCD _Data_3 LCD_D_2 LCD _Data_2 LCD_D_0 LCD _Data_0 LCD_D_1 LCD _Data_1 Figure 26 LCD (DBI) Interface Reference Circuit Diagram www.cavliwireless.com...

  • Page 60: Overall Technical Indicators

    C 20QM Hardware Manual Overall Technical Indicators 4.1 C hapter Overview The C20QM module RF overall specifications include the following sections: ✓ Working frequency ✓ GNSS Performances ✓ Antenna requirements 4.2 W orking Frequency Frequency Downstream Variant Uplink frequency Mode...
  • Page 61 C 20QM Hardware Manual LTE B28 703 MHz– 748 MHz 758 MHz – 803 MHz GSM 900 880 MHz-915 MHz 925 MHz-960 MHz GSM 1800 1710 MHz-1785 MHz 1805 MHz-1880 MHz LTE B2 1850 MHz– 1910 MHz 1930 MHz– 1990 MHz LTE B4 1710 MHz–...
  • Page 62 C 20QM Hardware Manual LTE B28 703 MHz - 748 MHz 758 MHz - 803 MHz LTE B38 2570 MHz– 2620 MHz 2570 MHz– 2620 MHz 2300 MHz – 2400 MHz 2300 MHz – 2400 MHz LTE B40 LTE B41 2496 MHz-2590 MHz 2620 MHz-2690 MHz GSM 900...

  • Page 63: G Nss Performance

    C 20QM Hardware Manual 4.3 G NSS Performance C20QM Module GNSS performance parameters: Table 4-2 GNSS performance parameters Features Description ✓ GPS L1/ Galileo E1 C/A: 1575.42 MHz Receiving Bands ✓ GLONASS L1 C/A: 1602.5625 MHz ✓ BD2 B1 C/A: 1561.098 MHz Positioning Accuracy: Autonomous: <2.0 m CEP50...
  • Page 64 C 20QM Hardware Manual B8 FDD <2:1 >16.5 <-88 〉-2.5dbi 〉40% B12 FDD <2:1 >16.5 <-88 〉-2.5dbi 〉40% B13 FDD <2:1 >16.5 <-88 〉-2.5dbi 〉40% B17 FDD <2:1 >16.5 <-88 〉-2.5dbi 〉40% B18 FDD <2:1 >16.5 <-88 〉-2.5dbi 〉40% B19 FDD <2:1 >16.5 <-88...

  • Page 65: Interface Electrical C Haracteristics

    60°C temperature (ambient) 5.3 Electrostatic Property There is no overvoltage protection inside the C20QM module. The ESD protection is required when the module is used to ensure product quality. ESD design recommendations: ✓ The USB port needs to add TVS on VDD, D+, D- for protection, and the TVS parasitic capacitance on D+/D- is <2pF...

  • Page 66: Module Io Level

    ±4 ±8 USIM interface ±4 ±8 VBAT power supply ±4 ±8 5.4 Module IO Level The C20QM module IO levels are as follows: Table 5.3 Electrical Characteristics of C20QM Module Parameter Description Minimum Maximum High level input 0.65*VIO VIO+0.3V voltage Low level input 0.3V...

  • Page 67: Power Supply

    C 20QM Hardware Manual 5.5 Power Supply The C20QM module input power requirements are as follows: Table 5.4 C20QM module Operating Voltage Parameter Minimum value Typical value Maximum value Input Voltage 3.4V 3.8V 4.5V The power-on time of any interface of the module must not be earlier than the boot time of the module, otherwise the module may be abnormal or damaged.
  • Page 68 C 20QM Hardware Manual Band 40 Band 38 506.9 Band 41 900 MHz 1800 AT+CFUN=0 31.8 SLEEP SHUTDOWN µA MODULE PEAK www.cavliwireless.com...

  • Page 69: Structural And Mechanical Properties

    C 20QM Hardware Manual Structural and Mechanical Properties 6.1 C 20QM module mechanical size The figure below shows the top and bottom view of the module. Figure 27 Top View and Bottom View of The Module Figure 28 C20QM Module Dimensions www.cavliwireless.com...

  • Page 70: Figure 29 Pad Dimensions (Top View)

    C 20QM Hardware Manual Figure 29 Pad Dimensions (Top view) www.cavliwireless.com...

  • Page 71: Ordering Information

    C 20QM Hardware Manual Ordering Information www.cavliwireless.com...

  • Page 72: Packaging And Production

    ✓ Module packaging and storage ✓ Production welding 8.2 Module Packaging and Storage The C20QM module is packaged in a tape reel with 500 pcs per reel, shipped as a tape reel sealed bag. Figure 30 C20QM Tape Measurements (in mm) www.cavliwireless.com...

  • Page 73: Production W Elding

    (allowing fluctuations of up to 5 degrees Celsius). 8.3 Production W elding The C20QM module is packaged in an anti-static tray. The SMT wire body needs to be equipped with a Tray module. It is recommended to use a reflow oven above 7 temperature zones.
  • Page 74 C 20QM Hardware Manual module falling parts, welding and welding, and poor internal welding of the module caused by the gravity of the module. The recommended furnace temperature curve is shown below: Figure 32 Reflow Soldering Temperature Graph Table 8.1 Reflow Process Parameter Table Warm zone Time Key parameter...

  • Page 75: Appendix

    C 20QM Hardware Manual Appendix 9.1 C hapter Overview ✓ Abbreviations ✓ Safety and precautions 9.2 Abbreviations Table 9.1 Abbreviations Abbreviations Full name 3GPP Third Generation Partnership Project Access Point Adaptive Multi-rate Bit Error Rate China Compulsory Certification CDMA Code Division Multiple Access European Conformity Circuit Switched Data Clear to Send...
  • Page 76 C 20QM Hardware Manual Discontinuous Reception EDGE Enhanced Data Rate for GSM Evolution European Union Electromagnetic Compatibility Electrostatic Discharge Federal Communications Commission GPRS General Packet Radio Service Global System for Mobile Communication HSDPA High-Speed Downlink Packet Access HSPA Enhanced High Speed Packet Access HSUPA High Speed Up-link Packet Access IMEI...

  • Page 77: Safety And Precautions

    C 20QM Hardware Manual Transient Voltage Suppressor Transmitting Direction UART Universal Asynchronous Receiver-Transmitter UMTS Universal Mobile Telecommunications System USIM Universal Subscriber Identity Module USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave Ratio WCDMA Wideband Code Division Multiple Access WWAN Wireless Wide Area Network 9.3 Safety and Precautions In order to use the wireless device safely, the terminal device informs the user of the relevant safety...

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