eFuse 4 Click Board

Product Description

How Does The eFuse 4 Click Board™ Work?

The eFuse 4 Click Board™ is an advanced power protection solution that utilizes the TPS25940 smart eFuse from Texas Instruments. The TPS25940 integrates back-to-back FETs and advanced built-in protection circuitry to provide robust protection for systems and applications powered by an external power supply within the voltage range of 2.7V to 18V. It also offers a comprehensive set of protection and monitoring features, including a low-power DevSleep™ mode that can be controlled via the DVS pin on the PWM pin of the mikroBUS™ socket, allowing compliance with the SATA™ Device Sleep standard. This advanced protection and monitoring capabilities make eFuse 4 Click an ideal solution for safeguarding your systems from power-related issues.

The eFuse 4 Click Board™ is designed to protect systems such as enterprise SSD drives against sudden power loss events. It monitors voltages of the input and output terminals to provide true reverse blocking from the output when a reverse condition or input power fail condition is detected. The TPS25940 allows users to program the overcurrent limit threshold between 1A and 5A via an external I2C-configurable digital potentiometer, the AD5272 from Analog Devices. Besides the overcurrent feature, the TPS25940 is also equipped with programmable over and undervoltage thresholds for load, source and device protection.

The TPS25940 also provides an additional power good comparator on the PGD pin, routed on the AN pin of the mikroBUS™ socket, with precision internal reference for output or any other rail voltage monitoring and a fault event indicator on the FLT pin. This fault indicator goes to a low logic state to indicate fault condition due to under/overvoltage, reverse voltage and thermal shutdown event in the event of an overcurrent. A special addition on the plate represents an unpopulated header which represents a precise current monitor output for health monitoring of the system, alongside Enable pin routed on the RST pin of the mikroBUS™ socket that controls the ON/OFF state of the internal TPS25940’s FETs.

The eFuse 4 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. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the eFuse 4 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Power Good Indicator	PGD	1	AN	PWM	16	DVS	DevSleep Mode
Reset	RST	2	RST	INT	15	FLT	Fault Indicator
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
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

EFUSE 4 CLICK ELECTRICAL SPECIFICATIONS

Software Support

void application_task ( void )  
 {   
     static char index; 

     if ( EFUSE4_ERROR != log_read( &logger, &index, 1 ) )  
     { 
         if ( ( index >= '0' ) && ( index <= '6' ) )  
         { 
             efuse4_set_current_limit ( &efuse4, limit_value_op[ index - 48 ] ); 
             log_printf( &logger, "  >>> Selected mode %d     rn", index - 48 ); 
             log_printf( &logger, "  Current limit is %d mA   rn", limit_value_op[ index - 48 ] ); 
             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 ); 
         } 
     } 
 }

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