Abstract: A transmitter circuit including an impedance setting circuit having first and second legs, wherein each leg includes an adjustable pull-up resistance and an adjustable pull-down resistance connected in series between a supply terminal and a reference terminal. A first-leg-node, between the adjustable resistances of the first leg, is connected to a first bus terminal. A second-leg-node, between the adjustable resistances of the second leg, is connected to a second bus terminal. The controller detects a transition in a transmission data signal, and in response to a dominant to recessive transition the controller controls a voltage setting circuit to set the differential driver voltage on the bus to a recessive value; adjusts each of the adjustable pull-up resistances and the adjustable pull-down resistances with the same target impedance profile such that the transmitter circuit drives the bus with a target driver impedance for an active recessive period of a bit time.

Abstract: An attenuation device for a CAN transceiver comprises two device output nodes configured to electrically couple the attenuation device via the device output nodes between two transceiver terminals of the CAN transceiver. The attenuation device is configured to change from a first device state to a second device state when a common mode voltage is applied to the device output nodes that is either greater than a first reference voltage or less than a second reference voltage that is less than the first reference voltage. The attenuation device causes a first electrical output resistance at each device output node during the first device state and causes a second electrical output resistance at each device output node during the second device state in which the second output resistance is less than the first output resistance.

Abstract: The embodiments described herein provide communication devices and methods that can facilitate communication between galvanically isolated systems. Specifically, the embodiments facilitate communication to a galvanically isolated system that is shut down without requiring that this shutdown system consume its own power while it is shutdown. To facilitate this, the communication devices and methods provide a wake-up device on the side of the shutdown system and facilitate the transfer of power across the galvanic isolation to the wake-up device when communication to the shutdown system is needed. With the wake-up device powered using power that was transferred across the galvanic isolation, the wake-up device can perform the actions needed to wake up the shutdown system, and can thus facilitate communication between the galvanically isolated systems. Thus, communication between galvanically isolated systems is facilitated without requiring that the shutdown system consume its own power during shutdown periods.