30 min

Harness the power of a high-speed CAN transceiver with TLE9251V and PIC18F45K40

CANquer challenges

CAN FD 3 Click with Curiosity HPC

Published Nov 01, 2023

Click board™

CAN FD 3 Click

Development board

Curiosity HPC


NECTO Studio



Maximize data throughput with our high-speed CAN FD transceiver, ensuring seamless communication in the automotive industry



Hardware Overview

How does it work?

CAN FD 3 Click is based on the TLE9251V, a High-Speed CAN transceiver operating as an interface between the CAN controller and the physical bus medium from Infineon. An HS CAN network is a two-wire, differential network that allows data transmission rates up to 5 MBit/s. The characteristic of an HS CAN network is the two signal states on the CAN bus: dominant and recessive. The CANH and CANL pins are the interface to the CAN bus and operate as input and output. The RxD and TxD pins are the interface to the microcontroller. The TxD pin is the serial data input from the CAN controller. The RxD pin is the serial data output to the CAN controller. The HS CAN transceiver TLE9251V includes a receiver and a transmitter unit, allowing the transceiver to send data to the bus medium and monitor the data from the bus medium simultaneously. The HS CAN transceiver TLE9251V converts the serial data stream, available on the transmit data input TxD, into a differential output signal on the CAN bus

provided by the CANH and CANL pins. The receiver stage of the TLE9251V monitors the data on the CAN bus and converts it to a serial, single-ended signal on the RxD output pin. A logical "low" signal on the TxD pin creates a dominant signal on the CAN bus, followed by a logical "low" signal on the RxD pin. The feature broadcasting data to the CAN bus and listening to the data traffic on the CAN bus simultaneously is essential to support the bit-to-bit arbitration within CAN networks. Based on the high symmetry of the CANH and CANL output signals, the TLE9251V provides a low level of electromagnetic emission (EME) within a wide frequency range. The TLE9251V fulfills even stringent EMC test limits without additional external circuits, like a common mode choke. In Power On Reset, all functions of the TLE9251V are disabled, and the device is switched off. The TLE9251V has an integrated overtemperature detection to protect the TLE9251V against the thermal overstress of the transmitter. The

overtemperature protection is active in Normal-operating Mode and is disabled in all other Modes. The temperature sensor provides one temperature threshold: TJSD.When the temperature exceeds the threshold, TJSD the transmitter is disabled. This overtemperature event will be signaled as logical "low" on the ERR output pin in Normal-operating Mode. After the device has cooled down, the transmitter is re-enabled, and NERR returns to logical "high." Hysteresis is implemented within the temperature sensor. Given all its components' features, the CAN FD Click is best used for infotainment applications, cluster modules, radar applications, and HVAC. The onboard SMD jumper labeled the VIO SEL selects which voltage rail will be used as the logic voltage level. It offers voltage selection between 3.3V and 5V so that the click board™ can be interfaced with both the 3.3V and 5V capable MCUs. The two UART wires (RX and TX) can also be connected directly through two pins on the board's left edge. 

CAN FD 3 Click hardware overview image

Features overview

Development board

Curiosity HPC, standing for Curiosity High Pin Count (HPC) development board, supports 28- and 40-pin 8-bit PIC MCUs specially designed by Microchip for the needs of rapid development of embedded applications. This board has two unique PDIP sockets, surrounded by dual-row expansion headers, allowing connectivity to all pins on the populated PIC MCUs. It also contains a powerful onboard PICkit™ (PKOB), eliminating the need for an external programming/debugging tool, two mikroBUS™ sockets for Click board™ connectivity, a USB connector, a set of indicator LEDs, push button switches and a variable potentiometer. All

these features allow you to combine the strength of Microchip and Mikroe and create custom electronic solutions more efficiently than ever. Each part of the Curiosity HPC development board contains the components necessary for the most efficient operation of the same board. An integrated onboard PICkit™ (PKOB) allows low-voltage programming and in-circuit debugging for all supported devices. When used with the MPLAB® X Integrated Development Environment (IDE, version 3.0 or higher) or MPLAB® Xpress IDE, in-circuit debugging allows users to run, modify, and troubleshoot their custom software and hardware

quickly without the need for additional debugging tools. Besides, it includes a clean and regulated power supply block for the development board via the USB Micro-B connector, alongside all communication methods that mikroBUS™ itself supports. Curiosity HPC development board allows you to create a new application in just a few steps. Natively supported by Microchip software tools, it covers many aspects of prototyping thanks to many number of different Click boards™ (over a thousand boards), the number of which is growing daily.

Curiosity HPC double image

Microcontroller Overview

MCU Card / MCU




MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


You complete me!


DB9 Cable Female-to-Female (2m) cable is essential for establishing dependable serial data connections between devices. With its DB9 female connectors on both ends, this cable enables a seamless link between various equipment, such as computers, routers, switches, and other serial devices. Measuring 2 meters in length, it offers flexibility in arranging your setup without compromising data transmission quality. Crafted with precision, this cable ensures consistent and reliable data exchange, making it suitable for industrial applications, office environments, and home setups. Whether configuring networking equipment, accessing console ports, or utilizing serial peripherals, this cable's durable construction and robust connectors guarantee a stable connection. Simplify your data communication needs with the 2m DB9 female-to-female cable, an efficient solution designed to meet your serial connectivity requirements easily and efficiently.

CAN FD 3 Click accessories image

Used MCU Pins

mikroBUS™ mapper

Standby Mode
Power Supply
I2C Clock
I2C Data
Power Supply

Take a closer look


CAN FD 3 Click Schematic schematic

Step by step

Project assembly

Curiosity HPC front no-mcu image hardware assembly

Start by selecting your development board and Click board™. Begin with the Curiosity HPC as your development board.

Curiosity HPC front no-mcu image hardware assembly
GNSS2 Click front image hardware assembly
MCU DIP 40 hardware assembly
Prog-cut hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
Curiosity HPC Access MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Necto DIP image step 7 hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.

Application Output Step 1

After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.

Application Output Step 3

Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.

Application Output Step 4

Software Support

Library Description

This library contains API for CAN FD 3 Click driver.

Key functions:

  • canfd3_generic_read - Generic read function

  • canfd3_generic_write - Generic write function

  • canfd3_set_cs_pin - Sets the CS pin state.

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 
 * \brief CanFd3 Click example
 * # Description
 * This example reads and processes data from CAN FD 3 clicks.
 * The demo application is composed of two sections :
 * ## Application Init 
 * Initializes the driver and enables the click board.
 * ## Application Task  
 * Depending on the selected mode, it reads all the received data or sends the desired message
 * every 2 seconds.
 * ## Additional Function
 * - canfd3_process ( ) - The general process of collecting the received data.
 * \author MikroE Team
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "canfd3.h"
#include "string.h"


#define TEXT_TO_SEND "MikroE\r\n"

// ------------------------------------------------------------------ VARIABLES


static canfd3_t canfd3;
static log_t logger;

// ------------------------------------------------------- ADDITIONAL FUNCTIONS

static void canfd3_process ( void )
    int32_t rsp_size;
    char uart_rx_buffer[ PROCESS_RX_BUFFER_SIZE ] = { 0 };
    uint8_t check_buf_cnt;
    rsp_size = canfd3_generic_read( &canfd3, uart_rx_buffer, PROCESS_RX_BUFFER_SIZE );

    if ( rsp_size > 0 )
        for ( check_buf_cnt = 0; check_buf_cnt < rsp_size; check_buf_cnt++ )
            log_printf( &logger, "%c", uart_rx_buffer[ check_buf_cnt ] );
    Delay_ms( 100 );

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
    log_cfg_t log_cfg;
    canfd3_cfg_t cfg;

     * 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.

    canfd3_cfg_setup( &cfg );
    canfd3_init( &canfd3, &cfg );

    canfd3_set_cs_pin( &canfd3, CANFD3_MODE_NORMAL );
    Delay_ms( 100 );

void application_task ( void )
    canfd3_process( );
    canfd3_generic_write( &canfd3, TEXT_TO_SEND, 8 );
    log_info( &logger, "--- The message is sent ---" );
    Delay_ms( 2000 );
void main ( void )
    application_init( );

    for ( ; ; )
        application_task( );

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

Additional Support