US 12,438,746 B2
Controller area network module and a method for the CAN module
Bernd Uwe Gerhard Elend, Hamburg (DE); and Matthias Berthold Muth, Stelle (DE)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Apr. 17, 2024, as Appl. No. 18/637,786.
Claims priority of application No. 23168569 (EP), filed on Apr. 18, 2023.
Prior Publication US 2024/0356775 A1, Oct. 24, 2024
Int. Cl. H04L 12/40 (2006.01); H04L 12/403 (2006.01)
CPC H04L 12/40078 (2013.01) [H04L 12/403 (2013.01); H04L 2012/40215 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A Controller Area Network, CAN, device, comprising:
a transmit data, TXD, interface, for sending a TXD signal,
a receive data, RXD, interface, for receiving an RXD signal,
a CAN controller coupled to both, the TXD interface and the RXD interface,
wherein the CAN device is configured to perform the following steps:
detect a first reference time at an end of an idle state of a CAN bus based on the RXD signal;
sample a first bit value of the RXD signal at a first sample time, wherein a first time interval between the first reference time and the first sample time is between 30% and 90% of a predefined reference time interval; and
sample a second bit value of the RXD signal at a second sample time such that the predefined reference time interval is provided between the first sample time and the second sample time;
wherein the CAN device is further configured according to one of the two following configurations:
in a first configuration, if the second bit value represents a dominant signal level, discarding the first or second bit value so that the remaining, non-discarded bit value forms a start bit value; or
in a second configuration, if the second bit value represents a dominant signal level, discarding the first and second bit values and replacing the discarded first and second bit values by an additionally acquired or determined start bit value of the RXD signal which represents a dominant signal level and to which a start sample time is assigned which is arranged between the first sample time and the second sample time; and
wherein the CAN device is further configured to perform the following steps:
sample at least a third bit value of the RXD signal; and
generate an RXD frame based on the bit values of the RXD signal, except for at least one discarded bit value of the first and second bit values.