DIGI Isolator Click

How does it work?

DIGI Isolator Click is based on two DCL540C01, high-speed, quad-channel digital isolators from Toshiba Semiconductor. Toshiba used the magnetic coupling structure and CMOS technology to achieve high reinforced isolation. The isolated lines are divided into two electrically connected groups. The first group comes in the form of 8 screw terminals, while the second forms a classic male 10-header row for easier jumper wire usage. Both groups of connectors have the same functions and are labeled the same. You can distinguish the power VDD2 and GND2 lines from the data lines: four SPI, UART TX/RX, and two digital IO lines. The isolator can work with supply voltages from 2.25 up to 5.5V.

DIGI Isolator Click uses standard 4-Wire SPI serial interface lines, standard UART TX/RX interface lines, and two additional GP lines from the mikroBUS™ socket as an insulated extension, marked D2 and D1, respectively. The SPI and UART pins are labeled according to the standard interface markings. These eight lines go through the DCL540C01s to the terminals and headers, thus isolating the host MCU from the connected device.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL switch. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. This Click board™ is 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 DIGI Isolator Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
General-Purpose I/O	D1	1	AN	PWM	16	NC
	NC	2	RST	INT	15	D2	General-Purpose I/O
SPI Chip Select	CS	3	CS	RX	14	TX	UART TX
SPI Clock	SCK	4	SCK	TX	13	RX	UART RX
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

DIGI Isolator Click electrical specifications

Software Support

We provide a library for the DIGI Isolator 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 DIGI Isolator Click driver.

Key functions

• digiisolator_spi_transfer DIGI Isolator SPI transfer function.

• digiisolator_uart_write DIGI Isolator UART data writing function.

• digiisolator_get_d1_pin_voltage DIGI Isolator read D1 pin voltage level function.

Example Description

This example demonstrates the use of the DIGI Isolator Click board™ by reading and writing data by using SPI and UART serial interface and reading results of AD conversion.

void application_task ( void ) 
 { 
     static uint8_t cmd_get_id[ 6 ] = { FLASH11_CMD_GET_ID }; 
     static uint8_t read_id[ 6 ] = { 0 }; 
     static char app_buf[ PROCESS_BUFFER_SIZE ] = { 0 }; 
     static float voltage = 0; 

     if ( DIGIISOLATOR_OK == digiisolator_spi_transfer( &digiisolator, &cmd_get_id[ 0 ], &read_id[ 0 ], 6 ) ) 
     { 
         if ( ( FLASH11_MANUFACTURER_ID == read_id[ 4 ] ) && ( FLASH11_DEVICE_ID == read_id[ 5 ] ) ) 
         { 
             log_printf( &logger, " SPIrn" ); 
             log_printf( &logger, " Manufacturer ID: 0x%.2Xrn", ( uint16_t ) read_id[ 4 ] ); 
             log_printf( &logger, " Device ID: 0x%.2X    rn", ( uint16_t ) read_id[ 5 ] ); 
             log_printf( &logger, " -----------------------rn" ); 
             Delay_ms( 2000 ); 
         } 
     } 

     if ( 0 < digiisolator_uart_write( &digiisolator, DEMO_MESSAGE, strlen( DEMO_MESSAGE ) ) ) 
     { 
         if ( 0 < digiisolator_uart_read( &digiisolator, app_buf, strlen( DEMO_MESSAGE ) ) ) 
         { 
             log_printf( &logger, " UARTrn" ); 
             log_printf( &logger, "%s", app_buf ); 
             memset( app_buf, 0, PROCESS_BUFFER_SIZE ); 
             log_printf( &logger, " -----------------------rn" ); 
             Delay_ms( 2000 ); 
         } 
     } 

     if ( DIGIISOLATOR_OK == digiisolator_get_d1_pin_voltage ( &digiisolator, &voltage ) )  
     { 
         log_printf( &logger, " ADCrn" ); 
         log_printf( &logger, " Voltage : %.3f[V]rn", voltage ); 
         log_printf( &logger, " -----------------------rn" ); 
         Delay_ms( 2000 ); 
     } 
 }

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.DIGIIsolator

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.