SolidSwitch 2 Click

How does it work?

SolidSwitch 2 Click as its foundation uses the L9026, an automotive multi-channel relay driver optimized for automotive relay and LED applications from STMicroelectronics. Eight channels of the L9026 represent two high-side and six configurable high-side/low-side drivers, which can be driven by an SPI interface or by two dedicated parallel inputs (IN0 and IN1 pins routed to the PWM and INT pins of the mikroBUS™ socket). Operating from an external power supply from 3V up to 18V, it provides a maximum current of 1A on its output terminals making this board an excellent choice for automotive applications (LEDs and relays) compatible with resistive, inductive, and capacitive loads.

As mentioned before, this Click board™ communicates with MCU through a standard SPI interface used to control and configure the loads and the device. The L9026 also offers advanced diagnostic and protection features such as short-to-ground, open load, overcurrent, and overtemperature detections, with status feedback of all diagnostic functions provided via the SPI interface.

Besides, the L9026 also features Idle mode for reduced current consumption, controlled via IDL pin routed to the AN pin of the mikroBUS™ socket and the “Limp home” mode. This mode allows using two selected drivers in particularly faulty conditions, such as SPI fault, micro fault, or supply undervoltage. The device can guarantee operations under a cranking scenario with a supply voltage down to 3V and ensures a low quiescent current under reset conditions.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to 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 SolidSwitch 2 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Idle Mode	IDL	1	AN	PWM	16	IN0	Parallel Command 0
	NC	2	RST	INT	15	IN1	Parallel Command 1
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

SolidSwitch 2 Click electrical specifications

Software Support

We provide a library for the SolidSwitch 2 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 SolidSwitch 2 Click driver.

Key functions

• solidswitch2_write_register This function writes a desired data to the selected register by using SPI serial interface.

• solidswitch2_toggle_in0_pin This function toggles the IN0 pin logic state.

• solidswitch2_toggle_in1_pin This function toggles the IN1 pin logic state.

Example Description

This example demonstrates the use of SolidSwitch 2 Click board™ by controlling the output state.

void application_task ( void ) 
 { 
     for ( uint16_t duty_cycle = SOLIDSWITCH2_MIN_DUTY_CYCLE; duty_cycle <= SOLIDSWITCH2_MAX_DUTY_CYCLE; duty_cycle += 5 ) 
     { 
         if ( SOLIDSWITCH2_OK == solidswitch2_write_register ( &solidswitch2, SOLIDSWITCH2_REG_PWM_GEN_DC,  
                                                               ( uint8_t ) ( SOLIDSWITCH2_MAX_DUTY_CYCLE - duty_cycle ) ) ) 
         { 
             log_printf ( &logger, " PWM GEN DC: %urn", ( SOLIDSWITCH2_MAX_DUTY_CYCLE - duty_cycle ) ); 
         } 
         if ( SOLIDSWITCH2_OK == solidswitch2_write_register ( &solidswitch2, SOLIDSWITCH2_REG_PWM_LED_DC, ( uint8_t ) duty_cycle ) ) 
         { 
             log_printf ( &logger, " PWM LED DC: %urn", duty_cycle ); 
         } 
         solidswitch2_toggle_in0_pin ( &solidswitch2 ); 
         log_printf ( &logger, " Toggle IN0 pinrn" ); 
         solidswitch2_toggle_in1_pin ( &solidswitch2 ); 
         log_printf ( &logger, " Toggle IN1 pinrnn" ); 
         Delay_ms ( 250 ); 
     } 
 }

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.SolidSwitch2

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 MikroElektronika compilers.

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.