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