Hall Current 16 Click

How does it work?

Hall Current 16 Click is based on the ACS37002, a 400kHz high-accuracy current sensor from Allegro Microsystems. It is a fully integrated Hall-effect current sensor, factory trimmed to provide high accuracy over the entire operating range without user programming. The current is sensed differentially by two Hall plates that subtract out interfering external common mode magnetic fields. The Hall sensor has no physical connection to the integrated current conductor, as the ACS37002 provides high isolation by magnetically coupling the field generated by the current in the conductor.

The current sensor features overvoltage detection, overcurrent fault, temperature compensation, and more. The ACS37002 is rated to withstand 3125VRMS of dielectric voltage. The IP+ and IP- terminals are fused internally and allow connecting the load over the load connectors. Depending on the position of the two GAIN SEL jumpers, the gain can be set as high as 66.7A for IP as a maximum. By default, the gain is set to 0 position on both jumpers, which results in a 50A bidirectional gain. The sensitivity can range from 19.8 to 39.6mV/A depending on the chosen gain.

The current sensor on the Hall Current 16 Click sends its output along with the zero current voltage reference to the ADC122S101, a two-channel 12-bit A/D converter from Texas Instruments. This ADC is fully specified over a sample rate range of 500ksps to 1Msps. It is based on a successive/approximation register architecture with an internal track-an-hold circuit.

Hall Current 16 Click uses a standard 4-Wire SPI serial interface of the ADC122S101 to communicate with the host MCU. If the sensed current exceeds the comparator threshold, the overcurrent fault (OCF) pin will trigger with an active LOW flag. The threshold can be set in percentage of full-scale output swing. You can turn off the overcurrent fault functionality.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. 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.

Specifications

Pinout diagram

This table shows how the pinout on Hall Current 16 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	OCF	Overcurrent Fault
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
SPI Data IN	SDI	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Hall Current 16 Click electrical specifications

Software Support

We provide a library for the Hall Current 16 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

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

Library Description

This library contains API for Hall Current 16 Click driver.

Key functions

• hallcurrent16_get_current Hall Current 16 get current function.

• hallcurrent16_get_voltage Hall Current 16 get voltage function.

• hallcurrent16_get_ovc_fault Hall Current 16 get overcurrent fault function.

Example Description

This example demonstrates the use of Hall Current 16 click board™ by reading and displaying the current measurements.

void application_task ( void ) 
 { 
     static float current; 
     if ( HALLCURRENT16_OK == hallcurrent16_get_current( &hallcurrent16, &current ) ) 
     { 
         log_printf( &logger, " Current : %.3f A rn", current ); 
     } 
     log_printf( &logger, " -------------------- rn" ); 
     Delay_ms( 1000 ); 
 }

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

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.HallCurrent16

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 MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE 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.