Analog Devices Inc. MAX3301xE +5V Control Area Network Transceivers

The MAX3301xE includes a fault detection feature where it monitors the CANH and CANL line for faults like overcurrent, overvoltage, and transmission failure. When a fault is detected, the FAULT pin goes high, which triggers an external interrupt with the local CAN controller. The driver and receiver lines are then placed in recessive mode. The system clock drives the TXD pin, and a fault code is transmitted through the RXD line back to the controller. When the specific fault code is transmitted, and the system is programmed to alert local service personnel, they can troubleshoot and debug the problem quicker. This option provides valuable diagnostics and decreased equipment downtime. MAX3301xE features a variety of options to address common CAN application requirements. These options include low-current standby mode and a slow slew rate for improved EMI performance. They also include silent-mode to disable the transmitter, a low-level translation to interface with low voltage controllers and loopback mode for remote self-diagnostics.

These devices are specified for data rates up to 5Mbps. The transceivers include a dominant timeout to prevent bus lockup caused by controller error or by a fault on the TXD input. When TXD remains in the dominant state (low) for longer than tDOM, the driver is switched to the recessive state, releasing the bus. The MAX33011E and MAX33012E come in a standard 8-pin SOIC package and the MAX33014E and MAX33015E come in a 10-pin TDFN-EP package. All of these devices operate over the -40°C to +125°C temperature range.