Boost 8 Click

How does it work?

Boost 8 Click is based on the LT1945, a dual micropower DC/DC converter from Analog Devices that boosts an input voltage to a higher level required by an output load. The LT1945 uses a constant off-time control scheme to provide high efficiency over a wide range of output currents. Each converter inside the LT1945 is designed with a 350mA current limit generating well-regulated positive and negative outputs of ±12V or ±24V, making the LT1945 ideal for various applications. It also contains additional circuitry to provide protection during the Start-Up sequence and under short-circuit conditions, reducing the average inductor output current and minimizing the power dissipation in the power switch.

As mentioned before, the LT1945 can configure the positive and negative output voltage in the ±12V or ±24V range. The desired output voltage can be selected by positioning SMD jumpers labeled as +VOUT SEL and -VOUT SEL to an appropriate position. It is also possible to control the activity of the output channels via two mikroBUS™ pins, EN+ and EN- pins, routed to the RST and PWM pin of the mikroBUS™ socket. By setting these pins to a high logic state, we set the converter outputs to an active state, and regulated voltages are available at the output terminals. In the same way, setting these pins to a low logic level disables the channels.

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. Additionally, there is a possibility for the LT1945 power supply selection via jumper labeled as VIN SEL to supply the LT1945 from an external power supply terminal in the range from 2.7V to 5V or with 3.3V from mikroBUS™ power rail. However, the Click board™ comes equipped with a library containing easy-to-use 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 Boost 8 Click 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	EN-	Negative Channel Control
Positive Channel Control	EN +	2	RST	INT	15	NC
	NC	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Boost 8 Click electrical specifications

Software Support

We provide a library for the Boost 8 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 Boost 8 Click driver.

Key functions

• boost8_enable_positive_voltage Enable positive voltage output function.

• boost8_disable_positive_voltage Disable positive voltage output function.

• boost8_enable_negative_voltage Enable negative voltage output function.

Example Description

This is an example that demonstrates the use of the Boost 8 Click board™.

void application_task ( void )  
 { 
     char inx; 

     // Waiting for the user input and performing actions based on a selected command. 
     if ( log_read( &logger, &inx, 1 ) != BOOST8_ERROR ) 
     { 
         switch(inx) 
         { 
             case '1' : 
             { 
                 log_printf( &logger, "Turning on positive output rn" ); 
                 boost8_enable_positive_voltage( &boost8 ); 
                 break; 
             } 
             case '2' : 
             { 
                 log_printf( &logger, "Turning off positive output rn" ); 
                 boost8_disable_positive_voltage( &boost8 ); 
                 break; 
             } 
             case '3' : 
             { 
                 log_printf( &logger, "Turning on negative output rn" ); 
                 boost8_enable_negative_voltage( &boost8 ); 
                 break; 
             } 
             case '4': 
             { 
                 log_printf( &logger, "Turning off negative output rn" ); 
                 boost8_disable_negative_voltage( &boost8 ); 
                 break; 
             } 
             case '5' : 
             { 
                 log_printf( &logger, "Turning on both outputs rn" ); 
                 boost8_enable_both_outputs( &boost8 ); 
                 break; 
             } 
             case '6' : 
             { 
                 log_printf( &logger, "Turning off both outputs rn" ); 
                 boost8_disable_both_outputs( &boost8 ); 
                 break; 
             } 
             default: 
             { 
                 log_printf( &logger, "> Invalid command rn" ); 
                 boost8_list_of_commands(); 
                 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.Boost8

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.