Mikroelektronika d.o.o.
Einzeldraht-CAN-Click-Platine
Einzeldraht-CAN-Click-Platine
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Das Single Wire CAN Click Board™ ist eine kompakte Zusatzplatine, die einen IC für eine Single Wire-Datenverbindung enthält, die mit verschiedenen Protokollen wie dem Controller Area Network (CAN) betrieben werden kann. Diese Platine verfügt über den Single Wire CAN-Transceiver NCV7356D1R2G von ON Semiconductor, der mit einer Versorgungsspannung von 5 V bis 27 V und einer Busgeschwindigkeit von bis zu 40 kbit/s betrieben wird. Es unterstützt viele zusätzliche Funktionen wie eine Unterspannungssperre, ein Timeout für fehlerhaft blockierte Eingangssignale, eine Ausgangsausblendzeit bei Busklingeln und einen sehr niedrigen Ruhestrom. Dieses Click Board™ kann in Industrieanlagen, Fahrzeugen und industriellen Netzwerken sowie in Anwendungen verwendet werden, bei denen die hohe Datenrate nicht erforderlich ist und eine niedrigere Datenrate Kostensenkungen erzielen kann.
Das Single Wire CAN Click wird von einer mikroSDK-kompatiblen Bibliothek unterstützt, die Funktionen enthält, die die Softwareentwicklung vereinfachen. Dieses Click Board™ wird als vollständig getestetes Produkt geliefert und ist bereit für den Einsatz auf einem System, das mit der mikroBUS™-Buchse ausgestattet ist.
How Does The Single Wire CAN Click Board™ Work?
The Single Wire CAN Click Board™ 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 Click Board™ 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.
The Single Wire CAN Click Board™ communicates with MCU using the UART interface for the data transfer. The onboard SMD jumper labelled 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
| Type | CAN |
| Applications | Can be used in industrial equipment, and applications such as in-vehicle and industrial networking. |
| On-board modules | The Single Wire CAN Click Board™ 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. |
| Key Features | Low power consumption, fully integrated receiver filter, loss of ground protection, undervoltage lockout, and more. |
| Interface | GPIO,UART |
| Compatibility | mikroBUS |
| Click board size | M (42.9 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the Single Wire CAN Click Board™ 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
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | VCC SEL | Right | Power Supply Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
SINGLE WIRE CAN CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 5 | - | 27 | V |
| CANH Voltage | -20 | - | +40 | V |
| Maximum Sleep Mode Current | - | - | 60 | μA |
| Operating Temperature Range | -40 | - | +125 | °C |
Software Support
We provide a library for the Single Wire CAN Click Board™ 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 the 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.
Example 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 Information
Depending on the development board you are using, you may need a 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
The Single Wire CAN 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.
Einzeldraht-CAN-Click-Platine
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