LTE IoT 3 Click

How does it work?

LTE IoT 3 Click is based on the EXS82-W, a Low Power Wide Area (LPWA) Wireless IoT module that allows connections to the LTE CAT-M1, CAT NB1/2, and 2G networks from Telit Cinterion. EXS82 IoT module supports all LTE bands and offers an efficient architecture with PSM and eDRX plus embedded processing. The EXS82 also includes a module services engine that supports a range of Internet services and optimized operations. State of the art security features protect the device as well as data and provide secure enrollment in cloud platforms enabling trust in the IoT ecosystem. The module’s simplified power supply design and advanced management system extend battery lifetime and improve the total cost of ownership.

The integrated GNSS receiver supports the NMEA protocol via the ASC0 interface, which represents combined electrical and data specification for communication between various electronic devices including GNSS receivers. By default, the GNSS receiver is switched off. It has to be switched on and configured using AT commands.

This Click board™ is equipped with the USB type C connector. It allows the module to be powered and configured by a personal computer (PC) using FT230X, a compact USB to a basic serial UART interface device which has been designed to operate efficiently with USB host controllers by using as little bandwidth as possible when compared to the total USB bandwidth available. The UART interface operates at 115200 bps and it is used for exchanging AT commands with the host, data transfer, and the firmware update. It also possesses the RX/TX LED Indicator whose indicates whether the bridge is in RX or TX function.

PWR Header can be used for power consumption monitoring:

LTE IoT 3 Click can be battery powered and used as a stand-alone device. It also has MC34671, a fully-integrated Li-Ion or Li-Polymer battery charger that allows charging of battery when Click board™ is inserted in mikroBUS™ socket or plugged into a USB port, while the CHG LED indicator which will indicate the charging in progress and will turn off once the battery charging is finished. The Nano SIM card holder on the back of the Click board™ is used to install a nano-SIM card. Two SMA antenna connectors with an impedance of 50Ω are used for connecting the appropriate antennas: there is one SMA connector for LTE antenna and the second one for GNSS antenna on which active antennas can be used either supplied with 3V or 5V, that can be selected by appropriate jumper (J2 or J3).

The yellow LED labeled as STAT is used to visually indicate different operating modes of the module. Another indicator that this Click board™ has is the PWI LED indicator that reports the module’s power state and shows whether it is active or in Power-Down mode. The onboard pushbutton labeled as ON is routed to the RST pin on the mikroBUS™ and it represents the ignition button.

This Click board™ uses the UART communication interface, but also provides the option to use other interfaces like SPI and I2C for connecting peripherals that need to be controlled, such as sensors. That can be achieved by populating the appropriate jumpers on the back of the board (J4 – J9), depending on the desired communication.

This Click board™ can be interfaced with both 3.3V and 5V MCUs because a proper logic voltage level conversion is performed by appropriate voltage level shifters, while the on-board LDOs are ensuring that the module is powered by recommended voltage levels.

Specifications

Pinout diagram

This table shows how the pinout on LTE IoT 3 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
SUSPEND Mode	SMI	1	AN	PWM	16	CS	SPI Chip Select
Ignition	ON	2	RST	INT	15	RTS	Ready to Send
Clear to Send	CTS	3	CS	RX	14	TX	UART TX
SPI Clock	SCK	4	SCK	TX	13	RX	UART RX
SPI Data OUT	SDO	5	MISO	SCL	12	SCL	I2C Clock
SPI Data IN	SDI	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

LTE IoT 3 Click electrical specifications

Software Support

We provide a library for the LTE IoT 3 Click on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Library Description

Library provides function for controlling device pins, and function for sendint AT commands over UART communication.

Key functions:

• void lteiot3_send_cmd ( uint8_t *cmd_buf ) - Function for sending commands to device.
• void lteiot3_set_pin_on ( uint8_t pin_state - Function for setting on pin state.

Examples description

The application is composed of three sections :

• System Initialization - Initialization of UART MODULE and additional pins
• Application Initialization - Turns on device and sends initial commands
• Application Task - Checks some device parameters by sending AT commands

void application_task ( )
{
    lteiot3_send_cmd( &AT_CGATT[0] );
    Delay_ms( 5000 );
    log_buffer();
    lteiot3_send_cmd( &AT_CEREG[0] );
    Delay_ms( 5000 );
    log_buffer();
    lteiot3_send_cmd( &AT_CSQ[0] );
    Delay_ms( 5000 );
    log_buffer();
}

The full application code, and ready to use projects can be found on our LibStock page.

Other mikroE Libraries used in the example:

• Conversions
• UART

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

mikroSDK

This Click board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.