Hall Current 9 Click

How does it work?

Hall Current 9 Click is based on the CQ3300, a high-speed response coreless current sensor using a Hall sensor that outputs the analog voltage proportional to the AC/DC from AKM Semiconductor. This current sensor has a small-size and high galvanic isolation, specially designed for the currents range from -6.4A to +6.4A. Quantum well ultra-thin film of Indium Arsenide is used as the Hall sensor, which enables the high-accuracy and high-speed current sensing showing good performance in small-sized inverter application. It has primary conductor resistance that reduces the heat generated by current significantly compared to a shunt resistor allowing a continuous current flow of 20Arms and has an ultra-fast high response of 0.5μs, making it also suitable for overcurrent applications.

The internal structure of the CQ3300 consists of several blocks such as primary conductor, Hall sensor, amplifier, buffer, compensation block, bias, and EEPROM unit. The primary conductor measure applied current, while the Hall element detects magnetic flux density generated from the measured current. Hall element’s output is then amplified, with a compensation circuit that adjusts the temperature drifts of sensitivity and zero-current output voltage. The last block is the output buffer with gain that outputs the voltage proportional to the current applied to the primary conductor.

The CQ3300 has a ratiometric output that means it changes proportionally to the supply voltage. It is suitable for applications where the analog output is converted to digital using an A/D converter and where fluctuation of the power supply voltage causes reference error of the A/D converter. Just like that, the output voltage 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 can be sent directly to an analog pin of the mikroBUS™ socket labeled as AN. Selection can be performed by onboard SMD jumper labeled as A/D SEL to an appropriate position marked as AN and ADC.

The MCP3221 provides one single-ended input with very low-power consumption, a low maximum conversion current, and a Standby current of 250 μA and 1 μA, respectively. Data can be transferred at rates of up to 100 kbit/s in the Standard and up to 400 kbit/s in the Fast Mode. Also, maximum sample rates of 22.3 kSPS with the MCP3221 are possible in a Continuous-Conversion Mode with a clock rate of 400 kHz.

This Click board™ is designed to be operated only with a 5V logic voltage level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with different logic levels. However, the Click board™ comes equipped with a library that contains 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 9 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Analog Signal	AN	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
	NC	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
	NC	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Hall Current 9 Click electrical specifications

Software Support

We provide a library for the Hall Current 9 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 9 Click driver.

Key functions:

• void hallcurrent9_cfg_setup ( hallcurrent9_cfg_t *cfg ); – Config Object Initialization function.
• HALLCURRENT9_RETVAL hallcurrent9_init ( hallcurrent9_t *ctx, hallcurrent9_cfg_t *cfg ); – Initialization function.
• void hallcurrent9_default_cfg ( hallcurrent9_t *ctx ); – Click Default Configuration function.

Examples description

The demo application reads ADC value and current value.

The demo application is composed of two sections :

void application_task ( void ) {   
    log_printf( &logger, "--------------------------rn", adc_data );
    hallcurrent9_read_adc( &hallcurrent9, &adc_data );
    log_printf( &logger, "   ADC     : %d rn", adc_data );

    current = hallcurrent9_get_current( &hallcurrent9, current_offset, calc_fact );
    log_printf( &logger, "   Current : %.2f mA rn", current );
    Delay_ms( 2000 );
}

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.HallCurrent9

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

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.