SPECIFICATIONS

Main features and pin functions
SN65HVD230 can be used in higher interference environments. The device has good transceiver capability at different rates, and its main features are as follows:
Fully compatible with ISO11898 standards;
High input impedance, allowing 120 nodes;
Low current waiting mode, typical current is 370 μA;
Signal transmission rate up to 1 Mb/s;
With thermal protection, open circuit failure protection function;
It has the function of resisting instantaneous interference and protecting bus;
Slope control to reduce radio frequency interference (RFI);
Differential receiver, with a wide range of common mode interference, electromagnetic interference (EMI) capability.

Working mode and control logic
The SN65HVD230 has 3 different working modes: high speed, slope and waiting. Its working mode can be controlled through the Rs control pin. Figure 2 is a typical application diagram of SN65HVD230 in a CAN bus system. As can be seen from the figure, the output pin Tx of the CAN controller is connected to the data input D of the SN65HVD230, and the data sent by the CAN node can be transmitted to the CAN network; and the receiving pin Rx of the CAN controller is connected to the data output of the SN65HVD230 R, Used to receive data. The SN65HVD230 mode selection port Rs is connected to a slope resistor grounded at one end through a jumper, and the selection of three working modes can be realized through hardware, in which the slope resistor is a potentiometer of 0 ~ 100kΩ.

MCP2551 high-speed CAN communication protocol controller bus interface module

MCP2551 is a fault-tolerant high-speed CAN device that can be used as a CAN protocol controller and physical bus interface. The MCP2551 provides differential transceiver capability for CAN protocol controllers and is fully compliant with ISO-11898 standards, including 24V voltage requirements.
Typically, each node on the CAN system must have a device that converts the digital signals generated by the CAN controller into signals suitable for bus transmission. It also adds a buffer between the CAN controller and the high voltage spikes on the CAN bus, which may be generated by external devices.
Supports a running rate of 1 MB/s.
Meet the ISO-11898 standard physical layer requirements.
Suitable for 12V and 24V systems. Slope external control to reduce RFI.
Automatic detection of TXD input grounding error.
Power-on reset and undervoltage protection in voltage events.
No power-on node or undervoltage will not affect the CAN bus.
Low current standby operation.
Up to 112 nodes can be connected.