10 min

Maximize motor performance with TB6549FG and PIC32MX795F512L

Unleash the motor's full potential

DC MOTOR 3 Click with UNI-DS v8

Published Jun 08, 2023

Click board™

DC MOTOR 3 Click

Development board



NECTO Studio



Take control of your motors and drive innovation in your engineering design with brushed motor control of up to 2 Amps!



Hardware Overview

How does it work?

DC MOTOR 3 Click is based on the TB6549FG, a full-bridge driver for direct current motors from Toshiba Semiconductor. The TB6549FG has built-in overcurrent protection, a thermal shutdown circuit, a standby system, and PWM motor capability. Full-bridge means it can run the connected motor in both directions. It has four modes to control the DC motors, CW, CCW, short brake, and stop. To prevent a penetrating current when upper and lower transistors are ON, a dead time of 300ns is provided in the IC when either of the transistors changes from ON to OFF, or vice versa. Note that a dead time is also provided in the IC at the time of transition between CW and CCW or between CW (CCW) and short brake mode, thereby eliminating the need for an OFF time. The TB6549FG also integrates an efficient full bridge

with low ON resistance of approximately 1Ω. Motor speed on this Click board™ can be controlled by PWM signal the mikroBUS™ socket. When PWM control is provided, normal and short brake operations are repeated. Do not attempt to control the output by inputting PWM signals to the standby pin. Doing so may cause the output signal to become unstable, destroying the IC. In standby mode, all circuits are turned OFF except the standby circuit and the charge pump circuit under the standby condition. DC MOTOR 3 Click features the SLP pin to control the standby mode. Pins IN1 and IN2 can select one of four driving modes, CW, CCW, short brake, and stop, by setting the logic states according to the table in the datasheet. DC MOTOR 3 Click does not use the power for the TB6549FG or the connected motor from the

mikroBUS™ socket. The right screw terminal powers the motor with a maximum supply voltage of 27V. The DC motor can be connected over the left screw terminal depending on the desired direction of the motor drive with a 2A max of output. At the bottom of the DC MOTOR 3 Click is a BAT SEL jumper to set the charge pump for driving the gate for the upper power transistor in the output circuit. On this Click board™, 24V is selected by default. This Click board™ can operate with either 3.3V or 5V logic voltage levels. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. 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.

DC MOTOR 3 Click hardware overview image

Features overview

Development board

UNI-DS v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different STM32, Kinetis, TIVA, CEC, MSP, PIC, dsPIC, PIC32, and AVR MCUs regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, UNI-DS v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the UNI-DS v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector. Communication options such as USB-UART, USB

HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. UNI-DS v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

UNI-DS v8 horizontal image

Microcontroller Overview

MCU Card / MCU



8th Generation



MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


You complete me!


DC Gear Motor - 430RPM (3-6V) represents an all-in-one combination of a motor and gearbox, where the addition of gear leads to a reduction of motor speed while increasing the torque output. This gear motor has a spur gearbox, making it a highly reliable solution for applications with lower torque and speed requirements. The most critical parameters for gear motors are speed, torque, and efficiency, which are, in this case, 520RPM with no load and 430RPM at maximum efficiency, alongside a current of 60mA and a torque of Rated for a 3-6V operational voltage range and clockwise/counterclockwise rotation direction, this motor represents an excellent solution for many functions initially performed by brushed DC motors in robotics, medical equipment, electric door locks, and much more.

DC MOTOR 3 Click accessories image

Used MCU Pins

mikroBUS™ mapper

Control Signal Input 1
Control Signal Input 2
Standby Mode
Power Supply
External Sync

Take a closer look


DC MOTOR 3 Click Schematic schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the UNI-DS v8 as your development board.

Fusion for PIC v8 front image hardware assembly
GNSS2 Click front image hardware assembly
SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
v8 SiBRAIN Access MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for DC MOTOR 3 Click driver.

Key functions:

  • dcmotor3_clockwise - This function set the direction of rotation in the clockwise direction by sets AN pin and clear RST pin.

  • dcmotor3_counter_clockwise - This function set the direction of rotation in the counter clockwise direction by clear AN pin and sets RST pin.

  • dcmotor3_short_brake - This function brake the engine by sets AN and RST pins on DC Motor 3 Click board.

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

 * @file 
 * @brief DcMotor3 Click example
 * # Description
 * This click has four operating modes: clockwise, counter-clockwise, short brake and stop. 
 * The operating mode is configured through IN1 and IN2 pins.
 * The demo application is composed of two sections :
 * ## Application Init 
 * Initialization driver enable's - GPIO,
 * PWM initialization, set PWM duty cycle and PWM frequency, start PWM, enable the engine, and start write log.
 * ## Application Task  
 * This is a example which demonstrates the use of DC Motor 3 Click board.
 * DC Motor 3 Click communicates with register via PWM interface.
 * It shows moving in the left direction from slow to fast speed
 * and from fast to slow speed.
 * Results are being sent to the Usart Terminal where you can track their changes.
 * @author Nikola Peric
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "dcmotor3.h"

// ------------------------------------------------------------------ VARIABLES

static dcmotor3_t dcmotor3;
static log_t logger;
uint8_t dcmotor3_direction = 1;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
    log_cfg_t log_cfg;
    dcmotor3_cfg_t cfg;

     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    dcmotor3_cfg_setup( &cfg );
    dcmotor3_init( &dcmotor3, &cfg );

    dcmotor3_set_duty_cycle ( &dcmotor3, 0.0 );
    dcmotor3_pwm_start( &dcmotor3 );
    Delay_ms( 1000 );
    dcmotor3_enable( &dcmotor3 );
    Delay_ms( 1000 );
    log_info( &logger, "---- Application Task ----" );

void application_task ( void )
    static int8_t duty_cnt = 1;
    static int8_t duty_inc = 1;
    float duty = duty_cnt / 10.0;

    if ( dcmotor3_direction == 1 )
        dcmotor3_clockwise( &dcmotor3 );
        log_printf( &logger, ">>>> CLOCKWISE " );
        dcmotor3_enable ( &dcmotor3 );
        dcmotor3_counter_clockwise( &dcmotor3 );
        log_printf( &logger, "<<<< COUNTER CLOCKWISE " );
        dcmotor3_enable ( &dcmotor3 );

    dcmotor3_set_duty_cycle ( &dcmotor3, duty );
    log_printf( &logger, "Duty: %d%%\r\n", ( uint16_t )( duty_cnt * 10 ) );
    Delay_ms( 500 );

    if ( 10 == duty_cnt ) 
        duty_inc = -1;
    else if ( 0 == duty_cnt ) 
        duty_inc = 1;
        if ( dcmotor3_direction == 1 )
            dcmotor3_direction = 0;
        else if ( dcmotor3_direction == 0 )
            dcmotor3_direction = 1;
    duty_cnt += duty_inc;

void main ( void )
    application_init( );

    for ( ; ; )
        application_task( );

// ------------------------------------------------------------------------ END

Additional Support