10 min

Ensure stable and protected power delivery with HS2950P and PIC32MX360F512L

Load protection HotSwitch® for various load conditions

Current Limit 10 Click with Explorer 16/32 development board

Published Dec 27, 2023

Click board™

Current Limit 10 Click

Development board

Explorer 16/32 development board


NECTO Studio



Keep your electronic device safe by controlling the amount of electrical current it uses and protecting it from voltage-related issues



Hardware Overview

How does it work?

Current Limit 10 Click is based on the HS2950P, a load protection HotSwitch from Semtech. It utilizes flexible and programmable protection features and can handle multiple fault conditions. During fault conditions, automatic output discharge will be activated, thus protecting the load, and the HS2950P will automatically restart from a fault condition. The under-voltage lockout threshold is set to the default position (2.6V). The overvoltage protection can be externally set over the OVP SEL jumper, choosing between values 5.44V, 12.36V,

and 24.13V. The OVP is set by default to 5.44V. The current limit threshold can be set over the MAX5419, a nonvolatile digital potentiometer from Analog Devices. You can also choose the onboard external resistor for a fixed 0.5A value. The selection can be made over the ILIM SEL jumper. The soft start time is set to 0.32 ms, and the turn-on delay is set to 4 ms. Current Limit 10 Click uses a standard 2-wire I2C interface of the MAX5419 to allow the host MCU to set the limit threshold. The HS2950P will alert the host MCU when the fault

condition occurs over the FLT pin, along with the FLT LED indicator. Finally, you can turn off the current limiter over the enable EN pin. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this 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.

Current Limit 10 Click hardware overview image

Features overview

Development board

Explorer 16/32 development board is a flexible and convenient development, demonstration, and testing platform for 16-bit PIC24 MCUs, dsPIC® DSCs, and 32-bit PIC32 MCUs from Microchip Technology. It features all the necessary hardware to develop and debug a complete embedded application. The board accepts Processor Plug-In Modules (PIMs) designed for the Explorer 16 or Explorer 16/32 development board for easy device swapping. In addition to the hardware features provided by the board, hardware expansion is possible through the use of PICtail™ Plus

daughter cards and mikroBUS™ accessory boards. Coupled with the integrated PICkit™-On-Board (PKOB), MPLAB ICD In-Circuit Debugger real-time debug facilities enable faster evaluation and prototyping of applications. This development board supports all the Explorer PIMs. However, not all PIMs are supported by the PKOB. To check the list of supported and unsupported PIMs, refer to the PICkit™ On-Board 3 (PKOB3) Support List. For PIMs not on the PKOB3 support list, use the JP1 or J14 connectors to program the device with a newer generation programming tool. Explorer 16/32

development board offers only the main board, allowing customization of the other necessary components. Choose your PIM based on MCUs and DSCs under consideration from a wide range of Processor Plug-In Modules. This board is optimal for customers migrating from Classic Explorer 16 to the new Explorer 16/32 platform, while all the necessary additional components like Processor Plug-In Modules and PICtail™ Plus Daughter Boards are already available.

Explorer 16/32 double side image

Microcontroller Overview

MCU Card / MCU




MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

Power Switch Enable
Power Supply
Fault Output
I2C Clock
I2C Data
Power Supply

Take a closer look


Current Limit 10 Click Schematic schematic

Step by step

Project assembly

Explorer 16/32 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Explorer 16/32 development board as your development board.

Explorer 16/32 front image hardware assembly
GNSS2 Click front image hardware assembly
PIM for PIC32MZ2048EFH100 front image hardware assembly
Prog-cut hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
Explorer 16/32 MB 1 Access - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Explorer 16/32 MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.

Application Output Step 1

After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.

Application Output Step 3

Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.

Application Output Step 4

Software Support

Library Description

This library contains API for Current Limit 10 Click driver.

Key functions:

  • currentlimit10_set_limit - This function sets the desired current limit threshold using the I2C serial interface.

  • currentlimit10_get_fault - This function gets the state of the fault flag to indicate overcurrent, overtemperature, or reverse-voltage conditions.

  • currentlimit10_enable - This function turns on the power switch and enables the internal MOSFET.

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 Current Limit 10 Click example
 * # Description
 * This library contains API for the Current Limit 10 Click driver for the current limiting 
 * to a certain value and displays the sources a current proportional to the load current [A].
 * The demo application is composed of two sections :
 * ## Application Init
 * Initialization of I2C module and log UART.
 * After driver initialization, the app executes a default configuration.
 * ## Application Task
 * This example demonstrates the use of the Current Limit 10 Click board. 
 * The demo application sets the current limit threshold of 750 mA and 
 * checks the fault flag for overcurrent conditions.
 * @author Nenad Filipovic

#include "board.h"
#include "log.h"
#include "currentlimit10.h"

static currentlimit10_t currentlimit10;
static log_t logger;

void application_init ( void ) 
    log_cfg_t log_cfg;  /**< Logger config object. */
    currentlimit10_cfg_t currentlimit10_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.
    currentlimit10_cfg_setup( &currentlimit10_cfg );
    CURRENTLIMIT10_MAP_MIKROBUS( currentlimit10_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == currentlimit10_init( &currentlimit10, &currentlimit10_cfg ) ) 
        log_error( &logger, " Communication init." );
        for ( ; ; );
    if ( CURRENTLIMIT10_ERROR == currentlimit10_default_cfg ( &currentlimit10 ) )
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    log_info( &logger, " Application Task " );
    Delay_ms( 100 );

void application_task ( void ) 
    if ( CURRENTLIMIT10_OK == currentlimit10_set_limit( &currentlimit10, 0.75 ) )
        Delay_ms( 100 );
        if ( CURRENTLIMIT10_FAULT_FLAG == currentlimit10_get_fault( &currentlimit10 ) )
            log_printf( &logger, "Fault flag: Overcurrent\r\n" );
            Delay_ms( 100 );
            log_printf( &logger, " Current limit is 0.75 A\r\n" );
            Delay_ms( 100 );
    Delay_ms( 1000 );

void main ( void ) 
    application_init( );

    for ( ; ; ) 
        application_task( );

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

Additional Support