Maxim MAX14878-MAX14880 Isolated CAN Transceivers
Maxim's MAX14878, MAX14879, and MAX14880 are isolated CAN transceivers that ensure reliable communication and improve uptime. They do this by integrating a high-speed CAN transceiver with integrated galvanic isolation, which protects against harsh and noisy industrial environments.
Industrial controls, HVAC, building automation, switchgear, and similar applications present a challenging electrical environment that can damage electronics and disrupt communication. Electronics in these applications require protection against things like large ground shifts, ESD, and voltage transients or surges. In these applications, downtime is very costly and typically has an impact beyond the affected circuit, but Maxim's isolated CAN transceivers offer the necessary protections to maximize uptime.
They integrate up to 5 kV of capacitive-based galvanic isolation to break ground loops and reduce noise on data lines. They also provide ±54 V fault protection on the CAN bus lines, and this simplifies the selection of external TVS components. The IC also protects against ESD up to ±15 kV between the bus pins and the bus side ground.
The transceiver supports the max high-speed CAN data rate of 1 Mbps and has a wide controller-side supply voltage of 1.71 to 5.5 volts. This allows the interface to be set to the same voltage as the CAN controller for a simpler design. There is also a TXD dominant timeout feature. This prevents an erroneous controller from clamping the CAN bus to its dominant state. Since the CAN protocol guarantees a maximum of 11 consecutive dominant bits—if TXD is held low in the dominant state longer than tdom—the transmitter is disabled to release the bus lines for use by other nodes. The transmitter is only reenabled on a rising edge of TXD. For power sensitive applications, both the MAX14879 and MAX14880 offer a standby mode for lower power consumption.
Transceivers are packaged in a wide 16-pin SOIC that provides 8 millimeters of creepage and clearance. The receiver inputs have a ±25 V common mode voltage range, which exceeds the -2 V to +7 V required per ISO11898, and they are rated to operate from -40°C to +125°C. For more information on Maxim's family of isolated high-speed CAN transceivers, the evaluation kit, and how to increase uptime in industrial systems visit Mouser.com.
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