eFuse 7 Click

How does it work?

eFuse 7 Click is based on the LS12052BD33, an eFuse with over-voltage protection and blocking FET control from Littelfuse. It is a current limit load switch with an integrated power load switch designed to manage current/voltage/start-up voltage ramp to the connected load. The internal MOSFET of the device will start conducting and allowing current to flow from IN to OUT as VIN rises by enabling the eFuse with an accurate ON/OFF threshold of 1.29V and 1.19V, respectively. After a Start-Up sequence, the eFuse will actively monitor its load current and input voltage. The eFuse will ensure that any harmful spikes are safely clamped to a pre-determined level at the output. The eFuse will shut down its internal MOSFET if the overload of the current limit is exceeded or the device’s temperature exceeds its threshold.

The eFuse uses the TP86R203NL, an N-channel MOS from Toshiba, as a gate to the output screw terminal. The current limit on this eFuse 7 Click can be programmed. For this purpose, there is the AD5227, a 64-position up/down control digital potentiometer from Analog Devices. This 10K end-to-end potentiometer, in variable resistor configuration, is used to feed the current limit program pin of the eFuse.

eFuse 7 Click uses a simple 3-Wire serial interface of the digital potentiometer to allow the host MCU to set the current limit to this Click board™. Over the RST pin, you can enable the eFuse with the logic HIGH.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VIO SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the 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 eFuse 7 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
Reset / ID SEL	RST	2	RST	INT	15	NC
SPI Select / ID COMM	CS	3	CS	RX	14	NC
SPI Clock	SCK	4	SCK	TX	13	NC
	NC	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

eFuse 7 Click electrical specifications

Software Support

We provide a library for the eFuse 7 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 eFuse 7 Click driver.

Key functions

• efuse7_enable_output eFuse 7 output enable function.

• efuse7_wiper_inc eFuse 7 wiper position increase function.

• efuse7_set_limit eFuse 7 set current limit function.

Example Description

This library contains API for the eFuse 7 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 )  
 { 
     static char index; 

     if ( 1 == log_read( &logger, &index, 1 ) )  
     { 
         if ( ( index >= '0' ) && ( index <= '7' ) )  
         { 
             efuse7_set_limit ( &efuse7, limit_value_op[ index - 48 ] ); 
             log_printf( &logger, "  >>> Selected mode %c     rn", index ); 
             log_printf( &logger, "---------------------------rn" ); 
             Delay_ms( 100 ); 
         } 
         else  
         {  
             log_printf( &logger, "    Data not in range!    rn" ); 
             log_printf( &logger, "---------------------------rn" ); 
             display_selection( ); 
             Delay_ms( 100 ); 
         } 
     } 
 }

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.eFuse7

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.