Hall Current 22 Click

How does it work?

Hall Current 22 Click is based on the ACS37041 (ACS37041KLHBLT-010B3), an integrated Hall effect current sensor from Allegro Microsystems, to provide current sensing in a wide range of industrial and energy-related applications. This sensor delivers a shuntless, self-contained current measurement solution, eliminating the need for an external sense resistor. It outputs an analog voltage signal that is galvanically isolated from the current being measured, enhancing safety and system flexibility. Hall Current 22 Click is well-suited for use in industrial motor drives, clean energy string and micro inverters, as well as personal mobility systems.

The internal current conductor of the ACS37041 features a low resistance of just 1.6mΩ, making it suitable for applications with stringent power dissipation requirements. With support for bidirectional current measurement up to ±10A, a high sensitivity of 132mV/A, and a functional working voltage of 100VRMS, this sensor offers reliable and accurate performance. Additionally, the ACS37041 is AEC-Q100 Grade 1 automotive qualified, ensuring robust operation in demanding environments.

The ACS37041’s output signal can be converted to a digital value using MCP3221, a successive approximation A/D converter with a 12-bit resolution from Microchip, using a 2-wire I2C compatible interface, or sent directly to an analog pin of the mikroBUS™ socket labeled as AN. Selection can be performed via an onboard SMD switch labeled AD SEL, placing it in an appropriate position marked as AN or I2C.

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. It also comes equipped with a library containing functions and example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on Hall Current 22 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Analog Output	AN	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Hall Current 22 Click electrical specifications

Software Support

Hall Current 22 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK‘s open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Example Description

This example demonstrates the use of Hall Current 22 Click board by reading and displaying the input current measurements.

Key Functions

• hallcurrent22_cfg_setup This function initializes Click configuration structure to initial values.
• hallcurrent22_init This function initializes all necessary pins and peripherals used for this Click board.
• hallcurrent22_calib_offset This function calibrates the zero current offset value.
• hallcurrent22_calib_resolution This function calibrates the data resolution at the known load current.
• hallcurrent22_read_current This function reads the input current level [A].

Application Init

Initializes the driver and calibrates the zero current offset and data resolution at 1A load current.

Application Task

Reads the input current measurements and displays the results on the USB UART approximately once per second.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output – Use the “Application Output” window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal – Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

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.