Revolutionize automotive and industrial communication with MCP2542 and PIC18F25K42

MCP2542 Click is based on the MCP2542WFD, a CAN transceiver with a wake-up pattern from Microchip. This IC supports both CAN and recently established CAN FD protocols with up to 8Mbps. The communication through the CAN bus is differential and performed through the twisted pairs with the characteristic impedance of 120 Ω. The CANH and CANL drivers drive the differential lines integrated into the MCP2542WFD IC. This provides robustness and immunity to electromagnetic interferences, typically observed in automotive systems. The ISO 11898 standard defines a signal line of twisted-pair cable as the network topology, terminated by the resistors with the characteristic impedance of the CAN bus (120 Ω), at both ends of the bus - to prevent signal reflection. This Click board™ does not need a termination resistor and includes additional protection on the CAN bus. The CAN bus uses two states: dominant and recessive. The dominant state is when the differential voltage between the CANH and CANL bus lines is above the dominant state detection level (0.9V), while the recessive state is below the recessive state detection level

(0.5V). Allowed differential voltage on the CAN bus can range between -12V and 12V. The logic level on the TX pin controls CANH and CANL drivers. A HIGH logic level on the TX line results in the recessive state on the CAN bus, while a LOW logic level results in the dominant state on the CAN bus. TXD line has the internal pull-up resistor (HIGH), making the MCP2542WFD device stay in recessive mode if the pin is left floating. The dominant/recessive states on the CAN bus are used for the message priority arbitration: the node that transmits the signal with the higher priority (the lower the binary message identifier number, the higher the priority) will win the arbitration, and the node with the lower priority will abort the transmission, waiting for the bus to become available again. The CAN bus states are reflected on the RX pin: the dominant state will drive the RX pin to a LOW logic level, while the recessive state will drive it to a HIGH logic level. This pin is also connected to the power supply via the internal pull-up resistor. MCP2542 Click uses a standard 2-Wire UART interface to communicate with the host MCU with commonly used UART RX and TX

lines. These lines are also routed to the header on the side of the Click board™, allowing them to be used with some other device. Besides TX and RX lines, CANH and CANL bus lines are also routed to a header next to the RX and TX header. The MCP2542WFD supports a standby mode. This function can be selected over the MODE SEL jumper. If this jumper is set to the STB position, the STBY of the transceiver pin will be routed to the STB pin of the mikroBUS™ socket., allowing the MCU to control it. If the jumper is set to the ON position, it will be routed to the GND directly, not allowing the MCP2542WFD device to enter the Standby mode. Finally, a D-SUB 9 male connector on the Click board™ connects to a CAN bus directly. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VIO SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this 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.

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.