Hall Current Click

How does it work?

Hall Current Click, as its foundation, uses 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 before, this Click board™ communicates with MCU through a standard unidirectional 16-bit SPI protocol used 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 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. 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.

Specifications

Pinout diagram

This table shows how the pinout on Hall current 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	NC
	NC	2	RST	INT	15	OCD	Over-Current Detection
SPI Chip Select	CS	3	CS	RX	14	NC
SPI Clock	SCK	4	SCK	TX	13	NC
SPI Data OUT	SDO	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

Hall current Click electrical specifications

Software Support

We provide a library for the Hall Current Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Hall Current Click driver.

Key functions

• Generic read 16-bit data function

• Check status of read data function.

• Read electric current function

Example Description

The application is current sensor.

 void application_task ( void ) 
 { 
     float current_read_float; 
     current_read_float = hallcurrent_read_current( &hallcurrent ); 

     Delay_ms( 100 ); 

     log_printf( &logger, " Current : %f ", current_read_float ); 
     log_printf( &logger, " [ A ] rn" ); 
     log_printf( &logger, "------------------------rn" ); 

     Delay_ms( 5000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.HallCurrent

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 MikroElektronika compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MikroElektronika 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.