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How the LTE Cat.4 3 Click board works

The LTE Cat.4 3 Click add-on board is based on the LARA-L6004D-01B, an LTE Cat 4 module in the most compact form factor from u-blox.

The module, designed for data transmission, supports DualStack IPv4/IPv6, FOAT/uFOTA, LwM2M, interference detection, etc. It works as a quad-band device in the frequency range of 700 MHz to 2600 MHz. There are two SMA antenna connectors to which you need to connect the appropriate antennas offered by MIKROE. The ANT1 antenna is the primary antenna and supports TX and RX, while ANT2 only supports RX for LTE Down-Link MIMO 2x2 configuration and 3G RX diversity.

The LTE Cat.4 3 Click features a nano SIM card holder for 1.8V and 3.0V SIM cards. The module is also equipped with a high-speed USB interface compliant with the 2.0 standard, with a data transfer rate of at least 480 Mbps. The module itself acts as a USB device and can be connected to any compatible USB host. It provides a virtual serial port over USB for AT commands and communications, a virtual serial port over USB for diagnostic logging, etc.

LTE Cat.4 3 Click uses a 2-wire UART interface to communicate with the host MCU, with the commonly used UART RX and TX supporting up to 30000000000 bps (default is 115200). Hardware flow control functions are also available via the RTS and CTS pins. Data transmission is also visualized via the TX LED. In addition to the library we have provided, you can use a set of AT commands to communicate with the module. The network status is available via the STS pin and the STATUS LED. Power to the module can be turned off using software, AT commands, or via the PWR pin. The module uses TXB0106 and PCA9306, bidirectional translators from Texas Instruments, to translate logic levels. An I2C interface with optional pull-up resistors is also available for communication with the main MCU.

The Click Board can operate with either 3.3V or 5V logic voltage levels, selectable via the VCC SEL jumper. Both 3.3V and 5V MCUs can utilize the communication lines properly. In addition, the Click Board comes with a library containing easy-to-use functions and code examples that can be used as a reference for further development.