The TCAN1144-Q1 and TCAN1146-Q1 are enhanced high-speed CAN FD transceivers supporting data rates up to 5 Mbps. These devices are configured using serial peripheral interface (SPI) in order to use all the features available. The devices support 1.8 V to 5 V processors by applying the appropriate voltage to the V_IO pin, allowing lower voltage processors to be utilized.

The TCAN1144-Q1 and TCAN1146-Q1 provide CAN FD transceiver function: differential transmit capability to the bus and differential receive capability from the bus. The device includes many protection features providing device and CAN network robustness. The CAN bus has two logical states during operation: recessive and dominant.

Recessive bus state is when the bus is biased to a common mode of about 2.5 V via the high resistance internal input resistors of the receiver of each node on the bus across the termination resistors. Recessive is equivalent to logic high and is typically a differential voltage 0.5 V or less between CANH and CANL. Recessive state is also the idle state.

Dominant bus state is when the bus is driven differentially by one or more drivers. Current is induced to flow through the termination resistors and generate a differential voltage on the bus. Dominant is equivalent to logic low and is a differential voltage on the bus greater than the minimum threshold of 0.9 V for a CAN dominant. A dominant state overwrites the recessive state.

Devices safety mechanisms SM-1, SM-2, SM-3 and SM-4 are provided by the device itself while SM-17 is an inherent mechanism provided by CAN protocol.