Achieve accurate and reliable AC/DC current sensing with TLI4970-D050T4 and STM32L496AG
Coreless magnetic current sensor for currents up to ±25A
Published Jul 22, 2025
Click board™
Hall Current Click
Dev. board
Discovery kit with STM32L496AG MCU
Compiler
NECTO Studio
MCU
STM32L496AG
AC/DC current sensor utilizing Hall technology, capable of measuring up to ±25A and certified according to industrial standards, ideal for use in both industrial and consumer applications
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Hardware Overview
How does it work?
Hall Current Click is based on the TLI4970-D050T4, a high-precision digital current sensor designed for the current range of ±25A from Infineon Technology. The measurement principle allows galvanic isolation (functional isolation) between the primary conductor and the secondary interface. Based on a digital concept, the signal processing unit of the TLI4970-D050T4 already has integrated compensation and calibration, which means no further external measurements for compensation are needed. It represents a plug-and-play solution, easy to use in industrial and consumer applications. The differential measurement principle of the TLI4970-D050T4 achieves best-in-class suppression of stray magnetic fields with a highly linear output signal
without hysteresis. The accuracy of the TLI4970-D050T4 is comparable to closed-loop current measurement systems and even better than open-loop systems with magnetic cores. But in comparison to the open- and closed-loop systems, the TLI4970-D050T4 enables significantly less power consumption. Besides outstanding long-term stability of the output signal and a proprietary dynamic offset cancellation technique that guarantees low zero point error, the TLI4970-D050T4 offers superior performance. As mentioned, this Click board™ communicates with MCU through a standard unidirectional 16-bit SPI protocol to control and configure the TLI4970-D050T4 with a maximum SPI frequency of 5MHz. In addition to communication pins, this board also
possesses an additional pin marked as OCD, routed to the INT pin on the mikroBUS™ socket for over-current detection. For fast over-current detection, the raw analog signal from the Hall probes is fed into a programmable comparator with a programmable glitch filter to suppress the signal’s fast switching transients and avoid false triggers. This Click board™ can only be operated with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.
Features overview
Development board
The 32L496GDISCOVERY Discovery kit serves as a comprehensive demonstration and development platform for the STM32L496AG microcontroller, featuring an Arm® Cortex®-M4 core. Designed for applications that demand a balance of high performance, advanced graphics, and ultra-low power consumption, this kit enables seamless prototyping for a wide range of embedded solutions. With its innovative energy-efficient
architecture, the STM32L496AG integrates extended RAM and the Chrom-ART Accelerator, enhancing graphics performance while maintaining low power consumption. This makes the kit particularly well-suited for applications involving audio processing, graphical user interfaces, and real-time data acquisition, where energy efficiency is a key requirement. For ease of development, the board includes an onboard ST-LINK/V2-1
debugger/programmer, providing a seamless out-of-the-box experience for loading, debugging, and testing applications without requiring additional hardware. The combination of low power features, enhanced memory capabilities, and built-in debugging tools makes the 32L496GDISCOVERY kit an ideal choice for prototyping advanced embedded systems with state-of-the-art energy efficiency.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M4
MCU Memory (KB)
1024
Silicon Vendor
STMicroelectronics
Pin count
169
RAM (Bytes)
327680
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Discovery kit with STM32L496AG MCU as your development board.
Track your results in real time
Application Output
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.
2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.
3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.
Software Support
Library Description
This library contains API for Hall Current Click driver.
Key functions:
hallcurrent_read_data- Generic read 16-bit data functionhallcurrent_check_status- Check status of read data functionhallcurrent_read_current- Read electric current function
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* \file
* \brief HallCurrent Click example
*
* # Description
* The application is current sensor.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization driver enable's - SPI and start write log.
*
* ## Application Task
* This is an example which demonstrates the use of Hall Current Click board.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "hallcurrent.h"
// ------------------------------------------------------------------ VARIABLES
static hallcurrent_t hallcurrent;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
hallcurrent_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.
hallcurrent_cfg_setup( &cfg );
HALLCURRENT_MAP_MIKROBUS( cfg, MIKROBUS_1 );
hallcurrent_init( &hallcurrent, &cfg );
HALLCURRENT_SET_DATA_SAMPLE_EDGE;
log_printf( &logger,"------------------------\r\n" );
log_printf( &logger, " Hall Current \r\n" );
log_printf( &logger, "------------------------\r\n" );
}
void application_task ( void )
{
log_printf( &logger, " Current : %.3f A \r\n", hallcurrent_read_current( &hallcurrent ) );
log_printf( &logger, "------------------------\r\n" );
Delay_ms ( 1000 );
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
Additional Support
Resources
Category:Current sensor
