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Cavli C42GM Hardware Manual Connect to our website and feel free to contact our technical support team for any assistance. Cavli Inc., 99 South Almaden Blvd., Suite 600, San Jose, California, 95113 Phone: 1-650-535-1150 Web: www.cavliwireless.com IoT Connectivity Platform: www.cavlihubble.io Support Centre https://www.cavliwireless.com/support-center.html...
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Cavli C42GM Hardware Manual VERSION HISTORY Version Description Date Initial 17-09-2021 1. Updated functional block diagram 2. Audio interface changed to PCM 3. Updated the corrected GNSS Active Antenna reference circuit 25-10-2021 4. Updated the corrected USB connection design diagram 5.
Cavli C42GM Hardware Manual Introduction This document is the Hardware Manual of Cavli Wireless solution product C42GM Smart Module, which describes the hardware composition and functional features of the module, the definition and usage of the application interface, and the electrical performance and mechanical properties of the module. This document and the other application documents combined will enable users to develop end devices with Cavli Modules.
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NOTE • The C42GM module recommends working at - 35°C to +75°C environment. It is suggested that the application terminal adopt temperature control measures under harsh conditions. At the same time, some RF indexes may exceed the limit. At the same time, it is suggested to be stored under a certain temperature •...
Module overview 2.1 Module introduction C42GM module is an LTE M1/NB1/NB2 based wireless communication module for the Internet of things. It is a highly integrated System-in-a-Chip (SoC) designed to support LTE CAT-M1 (eMTC) and CAT-NB1/NB2 (NB- IoT). It includes RAM memory and integrates low power and high-performance Cortex-R4 processor and radio transceivers as well as an impressive array of peripherals for connectivity.
✓ Baseband processing unit ✓ Power management unit ✓ Memory unit ✓ RF transceiver unit ✓ RF front-end unit ✓ GPS RF receiving unit C42GM module function block diagram is as follows: Figure 1 Functional block diagram of the C42GM module www.cavliwireless.com...
Cavli C42GM Hardware Manual 2.3 Device development kit In order to assist customers, develop their applications with ease, we provide a Device Development Kit (DDK) with RS232, USB and UART ports, Audio and stereo jacks and other peripherals to test and control the modules.
Cavli C42GM Hardware Manual Interface application description 3.1 Chapter 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 •...
Cavli C42GM Hardware Manual 3.2.2 C42GM Pin interface The C42GM module has the LCC interface. The module interface definition is shown in the following table Table 3 Pin Assignment Pin no. Pin name C42GM-S C42GM-SH C42GM-HG C42GM-HGAI PSM_IND ADC1 PCM_CLK...
Digital input Digital output Leaky open circuit 3.3 Power interface The C42GM module power interface consists of three parts: ✓ VBAT_BB is the module working power supply ✓ VBAT_RF is the module RF power supply ✓ VDD_EXT is 1.8V output power Table 5 Power Pin Definition Pin no.
74,79-82,89-91,100-102 3.3.1 Input power supply design The C42GM module can be powered by a single power supply mode. ✓ The module has 4 channels of power supply, two VBAT_BB and two VBAT_RF pins. ✓ The module power supply range is between 3.1V - 4.2V ✓...
Cavli C42GM Hardware Manual Figure 4 VBAT power supply 3.3.2 Power reference circuit The actual design of the power circuit can use a switching DC power supply or a linear LDO power supply to design the VBAT power supply, and then the PMOS transistor is used to control the power supply input so that the power supply can be completely cut off.
Cavli C42GM Hardware Manual NOTE • In order to prevent the module from being damaged by surge and overvoltage, a 5.1V/500mW Zener diode is suggested to be connected in parallel at the VBAT pin of the module. • It is suggested that 3 ceramic capacitors (33pF, 10pF, 100nF) be added to the VBAT line and placed near the VBAT pin.
Cavli C42GM Hardware Manual The PWRKEY can also be controlled with a button directly. In that case button accessories should be kept with a TVS tube for ESD protection. Reference circuit for the same is given below: Figure 9 Reference circuit for Button control NOTE •...
RESET input low -0.3 level voltage C42GM module can be reset with the AT Command AT+CFUN=1,1 for full functionality reset. Detailed instructions can be viewed in the C42GM AT instruction set manual. 3.5 USB interface The USB interface supports the following features: Software debugging, download/upgrade ✓...
Cavli C42GM Hardware Manual Table 9 Interface Pin Definition Pin no. Signal name Description USB_VBUS USB insertion detection, high level effective USB_DP USB differential signal + USB_DM USB differential signal - Module as USB slave device, supporting USB dormancy and wakeup mechanism. The USB interface...
Cavli C42GM Hardware Manual 3.6 UART interface C42GM module provides a full function serial port and two UART (2 lines) ports. The UART interface is defined as follows: Table 10 UART Serial Port Signal Definition Pin no. Name Description UART0_RI...
Cavli C42GM Hardware Manual When users want to use the full-featured serial port, they can refer to the following connection methods Figure 12 Full-featured serial port design If you need to use a 2-wire serial port, you can refer to the following serial port design: Figure 13 UART serial port design ✓...
Cavli C42GM Hardware Manual For the chip connection method, refer to the following circuit: Figure 14 Level conversion chip circuit 3.6.2 Debug serial port The debug serial port supports 115200bps baud rate. It is used for Linux control and log printing. It can reserve test points for module debugging.
Figure 15 RI pin signal waveform DTR: The DTR pin can be used as the sleep wake-up pin of the C42GM module. When the module enters sleep, the DTR pin can be pulled low to wake up the module. 1. Pull the DTR pin high first 2.
USIM card data USIM_CLK USIM card clock USIM_RST USIM card reset 3.7.1 USIM card reference circuit The C42GM module does not come with a USIM card slot. Users need to design a USIM card slot on their own interface board. www.cavliwireless.com...
Cavli C42GM Hardware Manual The USIM card interface reference circuit is as follows: Figure 16 USIM design circuit diagram NOTE • The recommended USIM interface cable is ONSEMI's SMF15C device for ESD protection. The peripheral circuit components should be placed close to the card holder, and the SIM card holder is close to the module layout.
The C42GM module provides an open-drain GPIO signal to indicate the status of the RF communication. 3.9.1 Network status C42GM provides one network status indication pin: NETLIGHT. The pin is used to drive a network status indication LED. The following tables describe the pin definition and logic level changes of NETLIGHT in different network activity status.
Cavli C42GM Hardware Manual Table 15 Network Indicator Pin Definition Pin no. Signal name Description NETLIGHT Network status indication Table 16 Network Indication Status Status LED display status No service Module Searching for Network Flashing The module registers 4G network or module...
40 mA. 3.9.2 Module status indication ✓ The C42GM module provides a pin as a working status indicator for the module. ✓ This pin can be used to connect to a GPIO or LED with pull-up.
Figure 18 STATUS Pin Reference Circuit 3.10 PCM and I2C interface ✓ C42GM one Pulse Code Modulation (PCM) and one I2C interface. ✓ The module provides PCM interface pins for external codec PCM decoder chip. ✓ The module provides a set of hardware bidirectional serial buses with an I2C interface ✓...
Figure 20 I2C interface reference circuit diagram 3.11 ADC interface The C42GM provides two analog-to-digital converter interfaces to read the voltage value. ✓ The ADC interface input voltage cannot exceed VBAT ✓ It is recommended that the ADC pin be input with a voltage divider circuit Pin no.
Cavli C42GM Hardware Manual 3.12 CAN interface Controller Area Network is an electronic communication bus which defines how communication happens, how wiring is configured and how messages are constructed, among other things. Collectively, this system is referred to as a CAN bus. It is a broadcast type of bus, all nodes can “hear” all transmissions. There is no way to send a message to just a specific node;...
Cavli C42GM Hardware Manual The following circuit shows a reference diagram for CAN interface: Figure 21 CAN reference circuit diagram 3.13 SPI interface Table 22 SPI Interface Pin Definition Signal name Description Pin no. SPI_SS Slave select SPI_SCLK Clock SPI_MOSI...
Cavli C42GM Hardware Manual 3.14 Sigfox interface ✓ Sigfox Network has a star topology: each of the access stations communicates with the Sigfox Cloud via a point-to-point link. ✓ It is implemented between the connected devices and the network. ✓ AT command is used to switch between Sigfox and LTE CAT M1 or NB.
Cavli C42GM Hardware Manual 3.16 PWM_OUT C42GM provides one Pulse width modulation signal output. The user can program the signal frequency using the SDK. Table 25 PWM_out Pin Definition Pin no. Signal name Description Pulse Width PWM_OUT Modulation signal 3.17 GPS C42GM provides Global Positioning System (GPS) whose pin description is given below.
Cavli C42GM Hardware Manual 4.2.1 Main antenna interface In order to facilitate the antenna debugging, one need to add π-type matching circuit on the motherboard and take 50-ohm impedance line. The π-type matching components should be placed as close to the antenna as possible.
〉40% 4.2.2 GNSS interface To use GNSS, you need to open the GPS with AT command AT+CGPS=1 (for details, please refer to C42GM AT command set manual) ✓ In order to facilitate the debugging of the antenna, it is necessary to add a π-type matching circuit to the main board, and to take a 50-ohm impedance line.
Cavli C42GM Hardware Manual NOTE An external LDO can be selected to supply power according to the active antenna • requirement. If the module is designed with a passive antenna, then the VDD circuit is not needed. • The following table gives GNSS antenna requirements:...
Cavli C42GM Hardware Manual ✓ Reacquisition ≤ 1 s Sensitivity: ✓ Cold Start: -147 dBm ✓ Tracking: -160 dBm ✓ Hot Start: -155 dBm ✓ Reacquisition: -158 dBm 4.4 RF trace reference ✓ The impedance of the RF signal line is determined by ✓...
Cavli C42GM Hardware Manual Figure 25 The complete structure of the multilayer PCB strip line Figure 26 Reference ground is the third layer PCB coplanar transmission line structure 4.5 RF connector size ✓ If the RF connector is used, the antenna connector must use a coaxial connector with a 50ohm characteristic impedance.
Cavli C42GM Hardware Manual Figure 27 RF connector size chart The RF connector plug for this connector is the U.FL-LP series from HRS. Figure 28 Antenna connector matching plug diagram Table 31 Main Parameters of the RF Connector Rated conditions...
Cavli C42GM Hardware Manual Figure 29 Matching coaxial RF line size For more details, please visit http://www.hirose.com 4.6 Working Frequency Table 32 RF Frequency Table Frequency band Uplink frequency Downstream frequency Mode LTE B1 1920 MHz–1980 MHz 2110 MHz–2170 MHz LTE B2 1850 MHz–1910 MHz...
• Working storage temperature • Module IO level • Power supply • Power consumption characteristics • Electrostatic property • Reliability index 5.2 Working storage temperature Table 33 C42GM Module Working Storage Temperature Parameter Minimum value Maximum value Normal operating temperature -30°C 85°C...
High level output VDD_EXT-0.45V VDD_EXT voltage Low level output 0.45V voltage 5.4 Power supply The C42GM module input power requirements are as follows: Table 35 C42GM Module Operating Voltage Parameter Minimum value Typical value Maximum value Input voltage 3.1V 3.6V 4.2V...
Cavli C42GM Hardware Manual 5.5.4 PCM and I2C Table 39 PCM Power Definition Level value (V) Signal name Parameter Typical PCM_IN -0.3 1.35 PCM_OUT 0.45 PCM_SYNC -0.3 PCM_CLK -0.3 Table 40 I2C Power Definition Level value (V) Signal name Parameter Typical 1.35...
AT+CFUN=0 Antenna, DPO off 5.7 Electrostatic property There is no overvoltage protection inside the C42GM module. When the module is used, the ESD needs to be protected to ensure product quality. EMC design recommendations: ✓ The USB port needs to add TVS on VDD, D+, D- for protection, and the TVS parasitic capacitance on D+/D- is <...
Cavli C42GM Hardware Manual Analog voice ±4 ±8 interface VBAT power supply ±4 ±8 5.8 Reliability index Table 43 C42GM Reliability Test Test items Test Conditions Guideline Test Results Temperature: –40 Visual inspection: to be tested Working mode: Function check: to be tested...
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Cavli C42GM Hardware Manual High temperature: Low temperature: – Temperature change time: < 30s Visual inspection: to be tested Working mode: no Temperature shock JESD22-A106-B Function check: to be tested packaging, no RF indicator check: to be tested Power on, do not...
Cavli C42GM Hardware Manual 6.3 C42GM module mechanical size The figure below shows the bottom view size of the module: Figure 31 Front view and side view of the module (unit: mm) www.cavliwireless.com...
Module packaging and storage • Production welding 8.2 Module packaging and storage The C42GM module is packaged in a tape reel with 500 pcs per reel, shipped as a tape reel sealed bag. Figure 35 C42GM Tape Measurements (in mm) www.cavliwireless.com...
Cavli C42GM Hardware Manual Figure 36 Reel Dimensions of C42GM (in mm) The storage of the C42GM module is subject to the following conditions: ✓ The module has a moisture sensitivity rating of 3. ✓ When the ambient temperature is greater than 40 degrees Celsius and the air humidity is less than 90%, the module can be stored in a vacuum sealed bag for 12 months.
Cavli C42GM Hardware Manual 8.3 Production welding The C42GM 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.
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Cavli C42GM Hardware Manual Table 45 Reflow Process Parameter Table Warm zone Time Key parameter Preheating zone Heating rate: 1℃/ s ~ 3℃ / s (4℃~ 165℃) Temperature zone (t1~t2): (160℃~210℃) 70s~120s (t3~t4): Recirculation zone Peak temperature: 235℃~ 245 ℃...
Cavli C42GM Hardware Manual Appendix 9.1 Chapter overview • Abbreviations • Safety and precautions 9.2 Abbreviations Table 46 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...
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Cavli C42GM Hardware Manual 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 International Mobile Equipment Identity...
Cavli C42GM Hardware Manual 9.3 Safety and precautions To use the wireless device safely, the terminal device informs the user of the relevant safety information: ✓ Interference: When the use of wireless devices is prohibited or the use of the device may cause interference and security of the electronic device, turn off the wireless device.
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10. CE EU Conformity Statement HEREBY, CAVLI INC DECLARES THAT THE EQUIPMENT TYPE LTE MODEM, MODEL C42GM IS IN COMPLIANCE WITH DIRECTIVE 2014/53/EU. MANUFACTURER ADDRESS: 99 SOUTH ALMADEN BLVD., SUITE 600, SAN JOSE, CA 95113 UNITED STATES. THE FULL TEXT OF THE EU DECLARATION OF CONFORMITY IS AVAILABLE AT THE FOLLOWING INTERNET ADDRESS: https://www.cavliwireless.com...
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The final host / module combination may also need to be evaluated against the FCC Part 15B criteria for unintentional radiators in order to be properly authorized for operation as a Part 15 digital device. The user’s manual or instruction manual for an intentional or unintentional radiator shall caution the user that changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
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étiquette indiquant le numéro de certification d'Innovation, Sciences et Développement économique Canada pour le module, préc édéd u mot «Contient»o u d'un libellés emblable exprimant la même signification, comme suit: "Contient IC:31113-C42GM” ou "où: 31113-C42GM est le numéro de certification du module".
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