10 min

Synchronize and secure your SPI data flow effortlessly with DCL541A01 and PIC18F2515

Isolate to elevate: Transforming SPI communication with precision and power!

SPI Isolator 5 Click with EasyPIC v8

Published Nov 01, 2023

Click board™

SPI Isolator 5 Click

Dev Board

EasyPIC v8


NECTO Studio



Our SPI isolator ensures data integrity by providing a robust barrier against electrical noise, guaranteeing a seamless and secure serial interface.



Hardware Overview

How does it work?

SPI Isolator 5 Click is based on the DCL541A01, a high-speed quad-channel digital isolator from Toshiba Semiconductor. The DCL541A01 stands out with its exceptional performance capabilities, made possible by leveraging Toshiba's advanced CMOS technology and a magnetic coupling structure. Not only does it meet the stringent safety standards of UL 1577 certification, but it also boasts an impressive withstand voltage rating of 5kVrms. Furthermore, its operating range spans from 2.25V to 5.5V, enabling seamless integration with lower voltage systems and facilitating voltage translation functionality across isolation barriers. With its versatility, this Click board™ is well-suited

for various applications, including industrial automation systems, motor control, inverters, and more. SPI Isolator 5 Click communicates with an MCU using the SPI serial interface with a maximum data rate of 150Mbps. The isolated lines are divided into two groups with the same lines. The first group comes in the form of 5 screw terminals, while the second forms a classic male 5-header row for easier jumper wire usage. Both groups of connectors have the same functions. You can distinguish the power VDD2 and GND2 lines from the data lines, which are CS2, SCK2, SDI2, SDO2, and DIS2. The DIS and DIS2 pins have the same function: to disable the lines from the

side of the isolator on which they are located. By setting the DIS pin to a high logic level, the input signals are disabled, and by setting it to a low logic level, they are enabled. The isolator can work with external supply voltages from 2.25V up to 5.5V, and the existence of an external power supply is easily visible using the PWR2 LED indicator. 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. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

SPI Isolator 5 Click hardware overview image

Features overview

Development board

EasyPIC v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports many high pin count 8-bit PIC microcontrollers from Microchip, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, EasyPIC v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the EasyPIC v8 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.

Communication options such as USB-UART, USB DEVICE, and CAN are also included, including the well-established mikroBUS™ standard, two display options (graphical and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from the smallest PIC MCU devices with only eight up to forty pins. EasyPIC v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

EasyPIC v8 horizontal image

Microcontroller Overview

MCU Card / MCU




MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

Signal Disable
SPI Chip Select
SPI Clock
Power Supply
Power Supply

Take a closer look


SPI Isolator 5 Click Schematic schematic

Step by step

Project assembly

EasyPIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyPIC v8 as your development board.

EasyPIC v8 front image hardware assembly
LTE IoT 5 Click front image hardware assembly
MCU DIP 28 hardware assembly
LTE IoT 5 Click complete accessories setup image hardware assembly
EasyPIC v8 28pin-DIP Access - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto DIP image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for SPI Isolator 5 Click driver.

Key functions:

  • spiisolator5_write - SPI Isolator 5 data writing function.

  • spiisolator5_read - SPI Isolator 5 data reading function.

  • spiisolator5_transfer - SPI Isolator 5 transfer function.

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

 * @file main.c
 * @brief SPI Isolator 5 Click example
 * # Description
 * This example demonstrates the use of SPI Isolator 5 click board 
 * by reading the manufacturer ID and device ID 
 * of the connected Flash 11 click board.
 * The demo application is composed of two sections :
 * ## Application Init
 * The initialization of SPI module, log UART, and additional pins.
 * After the driver init, the app performs enabling a device.
 * ## Application Task
 * The demo application reads and checks the manufacturer ID and 
 * device ID of the connected Flash 11 click board. 
 * Results are being sent to the UART Terminal, where you can track their changes.
 * @author Nenad Filipovic

#include "board.h"
#include "log.h"
#include "spiisolator5.h"

#define FLASH11_CMD_GET_ID         0x90, 0x00, 0x00, 0x00, 0x00, 0x00
#define FLASH11_DEVICE_ID          0x15

static spiisolator5_t spiisolator5;
static log_t logger;

void application_init ( void )
    log_cfg_t log_cfg;  /**< Logger config object. */
    spiisolator5_cfg_t spiisolator5_cfg;  /**< Click config object. */

     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    spiisolator5_cfg_setup( &spiisolator5_cfg );
    SPIISOLATOR5_MAP_MIKROBUS( spiisolator5_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == spiisolator5_init( &spiisolator5, &spiisolator5_cfg ) )
        log_error( &logger, " Communication init." );
        for ( ; ; );
    spiisolator5_enable( &spiisolator5 );
    Delay_ms( 100 );
    log_info( &logger, " Application Task " );
    log_printf( &logger, " -----------------------\r\n" );
    Delay_ms( 100 );

void application_task ( void )
    static uint8_t cmd_get_id[ 6 ] = { FLASH11_CMD_GET_ID };
    static uint8_t read_id[ 6 ] = { 0 };
    if ( SPIISOLATOR5_OK == spiisolator5_transfer( &spiisolator5, &cmd_get_id[ 0 ], &read_id[ 0 ], 6 ) )
        if ( ( FLASH11_MANUFACTURER_ID == read_id[ 4 ] ) && ( FLASH11_DEVICE_ID == read_id[ 5 ] ) )
            log_printf( &logger, " Manufacturer ID: 0x%.2X\r\n", ( uint16_t ) read_id[ 4 ] );
            log_printf( &logger, " Device ID: 0x%.2X    \r\n", ( uint16_t ) read_id[ 5 ] );
            log_printf( &logger, " -----------------------\r\n" );
            Delay_ms( 3000 );

void main ( void )
    application_init( );

    for ( ; ; )
        application_task( );

// ------------------------------------------------------------------------ END

Additional Support