30 min

Protect circuits from overcurrent and overvoltage with eFuse and STM32F100ZE

Limiting faults, maximizing safety: Redefine protection with us

eFuse 5 Click with Fusion for STM32 v8

Published Oct 12, 2023

Click board™

eFuse 5 Click

Development board

Fusion for STM32 v8


NECTO Studio



Experience the future of electronic circuit protection with our eFuse device, where precision control ensures your systems remain secure and perform optimally, even in challenging conditions



Hardware Overview

How does it work?

eFuse 5 Click is based on the TPS16530, an industrial eFuse from Texas Instruments. The TPS25940 provides robust protection for all systems and applications powered by an external power supply from 4.5V to 58V. Load, source, and device protections are provided with many programmable features, including undervoltage lockout selectable via UVLO SEL jumper and the fast response short circuit protection that immediately isolates the faulty load from the input supply when a short circuit is detected. The TPS16530 also allows users to program the overcurrent limit threshold between 0.6A and 4.5A via an external I2C-configurable digital

potentiometer, the AD5171 from Analog Devices. The TPS16530 can be put in low-power Shutdown mode using the EN pin of the mikroBUS™ socket, offering a switch operation to turn ON/OFF the eFuse. It also allows flexibility to configure the device between the two current-limiting fault responses (latch off and auto-retry). Selection is made by positioning SMD jumpers marked MODE SEL to the appropriate position marked GND or NC (GND is for automatic restart mode response during current limit and thermal fault, while NC is for latch off). For system status monitoring and downstream load control, the TPS16530 provides one fault signal, which can be visually detected

via the red FLT LED or the FLT pin on the mikroBUS™ socket, and a precise current monitor output available on the MON pin of the mikroBUS™ socket. Besides, the TPS16530 also features an open drain Power good (PGDD) indicator output, which can control downstream loads like DC/DC converters. 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.

eFuse 5 Click hardware overview image

Features overview

Development board

Fusion for STM32 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 32-bit ARM® Cortex®-M based MCUs from STMicroelectronics, 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, Fusion for STM32 v8 provides a fluid and immersive working experience, allowing

access anywhere and under any circumstances at any time. Each part of the Fusion for STM32 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. Fusion for STM32 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.

Fusion for STM32 v8 horizontal image

Microcontroller Overview

MCU Card / MCU



8th Generation


ARM Cortex-M3

MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

Current Monitor
Power Supply
Power-Good Indicator
Fault Interrupt
I2C Clock
I2C Data

Take a closer look


eFuse 5 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 Fusion for STM32 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 eFuse 5 Click driver.

Key functions:

  • efuse5_set_current_limit - eFuse 5 set the current limit function

  • efuse5_set_resistance - eFuse 5 set the resistance function

  • efuse5_get_fault - eFuse 5 gets fault condition state function

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 main.c
 * @brief eFuse 5 Click example
 * # Description
 * This library contains API for the eFuse 5 Click driver.
 * This driver provides the functions to set the current limiting conditions 
 * to provide the threshold of the fault conditions.
 * The demo application is composed of two sections :
 * ## Application Init
 * Initialization of I2C module and log UART.
 * After driver initialization, default settings turn on the device.
 * ## Application Task
 * This example demonstrates the use of the eFuse 5 Click board™.
 * In this example, the app sets the current limit to 600 mA for 10 seconds 
 * and then sets the current limit to 1200 mA for the next 10 seconds
 * to protect the electrical circuit against excessive current.
 * Results are being sent to the UART Terminal, where you can track their changes.
 * @author Nenad Filipovic

#include "board.h"
#include "log.h"
#include "efuse5.h"

static efuse5_t efuse5;
static log_t logger;

void application_init ( void ) 
    log_cfg_t log_cfg;  /**< Logger config object. */
    efuse5_cfg_t efuse5_cfg;  /**< Click config object. */

     * 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.
    efuse5_cfg_setup( &efuse5_cfg );
    EFUSE5_MAP_MIKROBUS( efuse5_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == efuse5_init( &efuse5, &efuse5_cfg ) ) 
        log_error( &logger, " Communication init." );
        for ( ; ; );
    if ( EFUSE5_ERROR == efuse5_default_cfg( &efuse5 ) )
        log_error( &logger, " Default configuration." );
        for ( ; ; );

    log_info( &logger, " Application Task " );
    log_printf( &logger, "---------------------------\r\n" );

void application_task ( void ) 
    if ( EFUSE5_OK == efuse5_set_current_limit( &efuse5, EFUSE5_CURRENT_LIMIT_600_mA ) )
        log_printf( &logger, "  Current limit:  600 mA   \r\n" );
        log_printf( &logger, "---------------------------\r\n" );
    Delay_ms( 10000 );
    if ( EFUSE5_OK == efuse5_set_current_limit( &efuse5, EFUSE5_CURRENT_LIMIT_1200_mA ) )
        log_printf( &logger, "  Current limit: 1200 mA   \r\n" );
        log_printf( &logger, "---------------------------\r\n" );
    Delay_ms( 10000 );

void main ( void ) 
    application_init( );

    for ( ; ; ) 
        application_task( );

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

Additional Support