Monarch Adapter Click

How does it work?

The Monarch Adapter Click is intended to help customers to successfully integrate and test their application based on Monarch Go. This Click adapter communication with your device through a serial UART interface and can exchange data with a cloud server using Verizon LTE network. The UART and GPIO pins of Monarch Go LTE-M modem is connected to one side of the level shifter, while the other side (Shifted) is connected to the respective mikroBUS™ UART and GPIO pins. However, the Monarch Go LTE-M modem series module is designed as the traditional DCE device (Data Communication Equipment) offering the full UART pin count, including the hardware flow control pins (CTS, RTS). These pins are routed to the mikroBUS™ CS (RTS) and the INT pin (CTS) and can be used in the MCU software if the hardware flow control is needed.

Digital sections of the Monarch Go LTE-M modem are internally supplied by 1.8V, so it is necessary to condition the communication bus lines which connect the host MCU with the module. The Monarch Adapter Click provide internal 1.8V via BH18PB1WHFV-TR LDO regulator from Rohm Semiconductor, output from its internal LDO regulator, providing a needed reference voltage for one side of the TXB0106, a 6bit bidirectional level shifting and voltage translator with automatic direction sensing, from Texas Instruments. The reference voltage for the other side of the level shifter is taken from the onboard SMD jumper, labeled as I/O Level This jumper is used to select between 3.3V and 5V from the mikroBUS™, depending on the used MCU type and its logic voltage level requirements.

Specifications

Pinout diagram

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

Notes	Pin					Pin	Notes
Ring signal	RNG	1	AN	PWM	16	NC
Reset	RST	2	RST	INT	15	INT	Clear to Send
Ready to Send	RTS	3	CS	RX	14	TX	UART TX (transmit)
	NC	4	SCK	TX	13	RX	UART RX (receive)
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Software Support

We provide a library for the Monarch Adapter 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

The library contains basic functions for working with the Monarch Adapter click.

Key functions:

• void monarch_send_command( uint8_t *cmd_buf, uint8_t len ) – Send command function

Examples description

The application is composed of three sections :

• System Initialization – Initializes UART modules and all required GPIO modules
• Application Initialization – Initializes driver inti and send basic commands.
• Application Task – Sends ATI1 command every 5000 ms.

void application_task ( )
{
    monarch_send_command( &MONARCH_CMD_ATI1[ 0 ], 4 );
    Delay_ms( 5000 );
}

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

Other mikroE Libraries used in the example:

• UART library
• Conversions Library

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.