CAN Basic Architectures - CAN System Engineering - page 36

Fig. 1.18 Calculation of a correction factor for drift correction (Level II)

For further details and amendments, refer to ISO 11898-4, Road vehicles—Con-
troller area network (CAN)—Part 4: Time-triggered communication as well as to
www.semiconductors.bosch.de/en/20/can/3-literature.asp.

1.4 CAN FD—CAN with Flexible Data Rate

CAN with flexible data rate (CAN FD) is a new protocol that combines CAN's
core features with a higher data rate. For automotive applications, CAN FD targets
an average data rate of 2.5 MBit/s with existing CAN transceivers, resulting in
the same effective payload as a low-speed FlexRay network. In other applications,
where long bus lines limit the bit rate in the Arbitration-Phase to, e.g. 125 kbit/s,
a higher acceleration factor is possible without exceeding the specification range
of existing CAN transceivers in the Data-Phase . New specification ranges for the
CAN transceivers are currently evaluated, while new transceiver designs may fur-
ther increase the acceleration factor.
There is an easy migration path from CAN systems to CAN FD systems since
CAN application software can be left (apart from configuration) unchanged. CAN FD
controllers can operate in CAN systems. The Bosch CAN IP - CAN Intellectual Prop-
erty - modules are currently being adapted to optionally support the CAN FD protocol.
The first engineering samples of microcontrollers with integrated CAN FD modules
are expected in 2013. International standardization of CAN FD is in preparation.