LTE Cat.1 2 Click (for EU)

How does it work?

LTE Cat.1 2 Click (EU) is based on the ELS62-E, a single antenna LTE Cat. 1bis module from Thales. The module supports GSM, GPRS, and EDGE in frequencies of 900 and 1800MHz. It also supports the LTE band in 800, 850, 1800, and 2100MHz frequencies. The module allows you to use SMS as a point-to-point MT and MO, cell broadcast, text, and PDU mode and allows you to use SIM card storage. The SIM card socket is placed below the board. It can achieve a download speed of 10.2Mbps and an upload speed of 5.2Mbps. The ELS62-E also comes with a USB C connector that supports a USB 2.0 standard and is high-speed (480Mbps) and full-speed compliant (12Mbps). The connector is intended for a firmware update of the modem.

The ELS62-E supports a digital audio interface (DAI) employed as a pulse code modulation interface (PCM). The PCM interfaces the MAX9860, a 16-bit mono audio voice codec from Analog Devices. It supports a low-noise microphone input, mono amplifier, automatic microphone gain control and noise gate, and more. The audio codec can output 30mW into a 32Ω earpiece with a microphone connected over the 3.5mm audio jack.

As the module uses several different voltages, there is an AP2112K, an LDO from Diodes Incorporated, which supplies the module with the needed 1.8V. There is also a TPS7A7002, an LDO from Texas Instruments, for the required supply of 4.2V. For logic-level translation, this Click™ board uses four SN74LVC1T450 transceivers and one PCA9306 transceiver, all from Texas Instruments. The yellow STAT LED indicates different operating modes of the module, while the blue PWI LED indicates the module’s 1.8V power supply.

LTE Cat.1 2 Click EU uses a standard UART interface to communicate with the host MCU with commonly used UART RX and TX pins. It also allows you to use a UART control flow pins RTS and CTS (CTS on pin CS). The UART of the modem can operate at fixed bit rates from 300bps up to 921600bps. Besides the library we provide, you can use an AT set of commands to control the module. The fast shutdown option is left disabled. You can enable it over the R27 resistor and use it over the FSD pin. The audio codec uses a standard 2-wire I2C interface to communicate with the host MCU. It allows you to use the volume control, shutdown mode, and more.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on LTE Cat.1 2 Click (for EU) corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	FSD	Fast Shutdown
ID SEL	RST	2	RST	INT	15	RTS	UART RTS
UART CTS / ID COMM	CS	3	CS	RX	14	TX	UART TX
	NC	4	SCK	TX	13	RX	UART RX
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	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 Cat.1 2 Click (for EU) electrical specifications

Software Support

We provide a library for the LTE Cat.1 2 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for LTE Cat.1 2 Click driver.

Key functions

• ltecat12_max9860_cfg LTE Cat.1 2 MAX9860 configuration function.

• ltecat12_send_cmd LTE Cat.1 2 send command function.

• ltecat12_send_sms_pdu LTE Cat.1 2 send SMS in PDU mode.

Example Description

Application example shows device capability of connecting to the network and sending SMS, TCP/UDP messages or calling the selected number using standard “AT” commands.

void application_task ( void )
{
    switch ( example_state )
    {
        case LTECAT12_CONFIGURE_FOR_NETWORK:
        {
            if ( LTECAT12_OK == ltecat12_cfg_for_network( ) )
            {
                example_state = LTECAT12_WAIT_FOR_CONNECTION;
            }
            break;
        }
        case LTECAT12_WAIT_FOR_CONNECTION:
        {
            if ( LTECAT12_OK == ltecat12_check_connection( ) )
            {
                example_state = LTECAT12_CONFIGURE_FOR_EXAMPLE;
            }
            break;
        }
        case LTECAT12_CONFIGURE_FOR_EXAMPLE:
        {
            if ( LTECAT12_OK == ltecat12_cfg_for_example( ) )
            {
                example_state = LTECAT12_EXAMPLE;
            }
            break;
        }
        case LTECAT12_EXAMPLE:
        {
            ltecat12_example( );
            break;
        }
        default:
        {
            log_error( &logger, " Example state." );
            break;
        }
    }
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.LTECat12

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. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE 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.