Single Wire CAN Click

How does it work?

Single Wire CAN Click is based on the NCV7356D1R2G, a Single Wire CAN transceiver from ON Semiconductor, which operates from a supply voltage from 5V to 27V with a bus speed up to 40 kbps. It can access several modes such as Normal Mode with reduced dominant output voltage and reduced receiver input voltage, High-Speed, High Voltage Wake-Up, or Sleep Mode. The transmission bit rate in Normal communication is 33 Kbits/s, while a typical bit rate of 83 kbit/s is recommended for High-Speed communication. In Normal Transmission Mode, the Single Wire CAN Click supports controlled waveform rise and overshoot times, while the High−Speed Mode is only intended to be operational when the bus is attached to an off−board service node.

The Single Wire CAN bus pin CANH is composed of a pull−up amplifier for driving this Click board™. The minimum output driver capability is 50 mA, but output shorts to the ground can reach 350mA. Normal CANH output voltage is between 4.4 V and 5.1 V. These amplitudes increase to between 9.9 V and 12.5 V for system selection in Wake−Up Mode. The bus Wake−Up from Sleep Input Voltage Threshold is between 6.6 V and 7.9 V, but to maintain normal communication, the threshold is 2.1 V. The CANH pin can also act as a bus read amplifier.

The NCV7356D1R2G communicates with MCU using the UART interface at 9600 bps with commonly used UART RX and TX pins. It possesses additional functionality such as Operational Mode Selection MODE 0 and MODE 1 routed at RST and CS pins of the mikroBUS™, on whose selected logical states one of the four possible operational modes can be selected. The transceiver provides a weak internal pulldown current on each of these pins which causes the transceiver on default to enters to sleep mode when they are not driven. Single Wire CAN Click can also re-enter the Sleep Mode if there is no mode change within typically 250 ms.

This Click board™ communicates with MCU using the UART interface for the data transfer. The onboard SMD jumper labeled as VCC SEL allows logic level voltage selection for interfacing with both 3.3V and 5V MCUs. More information about the NCV7356D1R2G’s functionality, electrical specifications, and typical performance can be found in the attached datasheet. However, the Click board™ comes equipped with a library that contains easy to use functions and a usage example that may be used as a reference for the development.

Specifications

Pinout diagram

This table shows how the pinout on Single Wire CAN Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
Mode Select 0	MD0	2	RST	INT	15	NC
Mode Select 1	MD1	3	CS	RX	14	TX	UART TX
	NC	4	SCK	TX	13	RX	UART RX
	NC	5	MISO	SCL	12	NC
	NC	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

Single Wire CAN Click electrical specifications

Software Support

We provide a library for the Single Wire CAN Click on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Library Description

The library covers all the necessary functions to control Single Wire CAN click board. Library performs a standard UART interface communication.

Key functions:

• void singlewirecan_set_operating_mode ( uint8_t op_mode ) – Set operating mode function.
• void singlewirecan_write_data ( uint8_t *tx_data ) – Write multi bytes function.

Examples description

The application is composed of three sections :

• System Initialization – Initializes UART, sets CS and RST pins as output.
• Application Initialization – Initialization driver enables – UART, performs an operating mode, also write log.
• Application Task – (code snippet) This is an example that demonstrates the use of the Single Wire CAN click board. This application task writes message data via UART every 3 seconds. Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( )
{
    mikrobus_logWrite( "----------------------", _LOG_LINE );
    mikrobus_logWrite( "", _LOG_LINE );

    singlewirecan_write_data( &demo_message_data[ 0 ] );

    mikrobus_logWrite( "  TX Data:  ", _LOG_TEXT );
    mikrobus_logWrite( demo_message_data, _LOG_LINE );
    Delay_ms( 3000 );

}

The full application code, and ready to use projects can be found on our LibStock page.

Other mikroE Libraries used in the example:

• UART

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

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.