Current Limit 9 Click

How does it work?

Current Limit 9 Click is based on the NPS4053, a load switch with a precision adjustable current limit from Nexperia. It limits the output current to a constant current using a constant-current mode when the output load exceeds the current limit threshold or is shorted. An internal voltage comparator turns off the load switch to protect devices on the input side of the switch when the output voltage is higher than the input. The other protections include active reverse voltage protection, ILIM pin protection, ESD protection, and more.

The current to which you can set the limit over the Current Limit 9 Click board™ can be selected between external supply or 5V from the mikroBUS™ socket via the VIN SEL jumper. The external voltage can be in the range of 2.5 – 5.5V. It can use the MAX5419, a 256-tap 200K nonvolatile digital potentiometer from Analog Devices, to set the current limit threshold to the NPS4053 over the ILIM pin. It can also use an onboard R9 resistor for a fixed 0.5A at 5V supply. The selection can be made over the ILIM SEL.

Current Limit 9 Click uses a standard 2-Wire I2C interface of the MAX5419 to allow the host MCU to set the desired current limit threshold, which supports a fast I2C interface. You can turn the current limit IC on or off over the ON pin. The FLT is an interrupt pin, and it is asserted to a low logic level during overcurrent, overtemperature, and reverse-voltage conditions.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, 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 Current Limit 9 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
Current Limit Enable	ON	2	RST	INT	15	FLT	Fault Interrupt
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	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Current Limit 9 Click electrical specifications

Software Support

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

Key functions

• currentlimit9_set_limit This function sets the desired current limit threshold using the I2C serial interface.

• currentlimit9_get_fault This function gets the state of the fault flag to indicate overcurrent, overtemperature, or reverse-voltage conditions.

• currentlimit9_enable This function turns on the power switch and enables the internal MOSFET.

Example Description

This library contains API for the Current Limit 9 Click driver. This driver provides the functions to set the current limiting conditions in order to provide the threshold of the fault conditions.

void application_task ( void ) 
{
    if ( CURRENTLIMIT9_FAULT_FLAG == currentlimit9_get_fault( &currentlimit9 ) )
    {
        log_printf( &logger, "Fault flag: Overcurrentrn" );
    }
    else
    {
        log_printf( &logger, " Current limit is 460 mArn" );
    }
    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.CurrentLimit9

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.